Advantages of aerated concrete blocks: composition and characteristics. Terms and Definitions

GOST 31360-2007

Group Zh33

INTERSTATE STANDARD

UNREINFORCED WALL PRODUCTS
AUTOCLAVED CELLULAR CONCRETE

Specifications

Wall unreinforced products of cellular autoclave curing concrete.
Specifications

ISS 91.100.30
OKP 57 4140

Date of introduction 2009-01-01

Preface

The goals, basic principles and basic procedure for carrying out work on interstate standardization are established by GOST 1.0-92 "Interstate standardization system. Basic provisions" and MSN 1.01-01-96 * "System of interstate regulatory documents in construction. Basic provisions"
_______________
* The document was not accepted on the territory of the Russian Federation. Until October 1, 2003, SNiP 10-01-94 was in force. - Database manufacturer's note.


Standard information

1 DEVELOPED by the Institute of Reinforced Concrete Construction - a branch of the Federal State Unitary Enterprise "National Research Center Construction" with the participation of the TsNIISK im. Kucherenko, MGSU, VGASU (Voronezh), JSC "LZID" (Lipetsk), JSC "NLMK" (Lipetsk), LLC "AEROC" (St. Petersburg), JSC "LKSI" (St. Lipetsk), LLC "Reftinsky Association "Teplit" (Sverdlovsk region), JSC "Glavnovosibirskstroy", JSC "Cottage" (Samara), Federal State Unitary Enterprise "211 KZHBI" (Leningrad region)

2 INTRODUCED by the Technical Committee for Standardization TC 465 "Construction"

3 ADOPTED by the Interstate Scientific and Technical Commission for Standardization, Technical Regulation and Certification in Construction (MNTKS) (Minutes No. 32 of November 21, 2007)

The following voted for adoption:

4 This standard is in accordance with the European standard EN 771-4:2003 "Specification for masonry units. Part 4: Autoclaved aerated concrete masonry units" in terms of assessing the conformity of the quality of products made from cellular concrete

5 By Order of the Federal Agency for Technical Regulation and Metrology dated May 21, 2008 N 109-st, the interstate standard GOST 31360-2007 was put into effect as a national standard of the Russian Federation on January 1, 2009.

6 INSTEAD GOST 21520-89 regarding products made of autoclaved cellular concrete


Information on the entry into force (termination) of this standard is published in the “National Standards” index.

Information about changes to this standard is published in the “National Standards” index, and the text of the changes is published in the “National Standards” information indexes. In case of revision or cancellation of this standard, the relevant information will be published in the information index "National Standards"

1 area of ​​use

1 area of ​​use

This standard applies to non-reinforced wall products made from autoclaved cellular structural heat-insulating concrete (hereinafter referred to as products), intended for use as load-bearing and self-supporting elements in the external walls of buildings and structures with dry, normal and wet operating modes in a non-aggressive environment, as well as for internal walls and partitions in rooms with a relative air humidity of no more than 75% and a non-aggressive environment. When the relative air humidity is more than 75%, the internal surfaces of the external walls of the products must have a vapor barrier coating.

This standard establishes technical requirements, test methods and assessment of product quality compliance with this standard based on test results.

Note - Reinforced products made of autoclaved cellular concrete are manufactured in accordance with GOST 19010.

2 Normative references

This standard uses references to the following interstate standards:

GOST 4.212-80 System of product quality indicators. Construction. Concrete. Nomenclature of indicators

GOST 3560-73 Steel packaging tape. Specifications

GOST 7076-99 Construction materials and products. Method for determining thermal conductivity and thermal resistance under stationary thermal conditions

GOST 7502-98 Metal measuring tapes. Specifications

GOST 10180-90 Methods for determining strength using control samples

GOST 12730.1-78 Concrete. Density determination method

GOST 13015-2003 Reinforced concrete and concrete products for construction. General technical requirements. Rules for acceptance, labeling, transportation and storage

GOST 14192-96 Marking of cargo

GOST 18105-86 Concrete. Strength control rules

GOST 18343-80 Pallets for bricks and ceramic stones. Specifications

GOST 19010-82 Concrete and reinforced concrete wall blocks for buildings. General technical conditions

GOST 21520-89 Small blocks made of cellular concrete for walls. Specifications

GOST 24104-2001 Laboratory scales. General technical requirements

GOST 25485-86 Cellular concrete. Specifications*
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*Probably an error in the original. You should read GOST 25485-89 Cellular concrete. Technical specifications, hereinafter. - Database manufacturer's note.

GOST 25898-83 Construction materials and products. Methods for determining vapor permeation resistance

GOST 26433.1-89 System for ensuring the accuracy of geometric parameters in construction. Rules for performing measurements. Factory-made elements

GOST 27005-86 Lightweight and cellular concrete. Average Density Control Rules

GOST 27006-86 Concrete. Squad selection rules

GOST 30244-94 Construction materials. Flammability test methods

GOST 30108-94 Construction materials and products. Determination of specific effective activity of natural radionuclides

GOST 31359-2007 Autoclave-hardening cellular concrete. Specifications

Note - When using this standard, it is advisable to check the validity of the reference standards using the “National Standards” index compiled as of January 1 of the current year, and according to the corresponding information indexes published in the current year. If the reference standard is replaced (changed), then when using this standard you should be guided by the replacing (changed) standard. If the reference standard is canceled without replacement, then the provision in which a reference is made to it is applied in the part that does not affect this reference.

3 Terms and definitions

The following terms with corresponding definitions are used in this standard:

3.1 block: A product with a usually rectangular cross-section and a thickness slightly less than its width.

3.2 plate: A product with a rectangular cross-section, the thickness of which is significantly less than other dimensions and is constant throughout the product.

3.3 U-shape block: A product with a recess in the bed surface running parallel to a larger linear dimension of the product.

3.4 Grip pockets: Non-through recesses in the end surface of products intended for manual carrying of products.

3.5 technological void: A through or non-through cavity molded or drilled into a product.

3.6 nominal size: The standardized size of a product, the actual size of which corresponds to the limits of permissible deviations.

4 Technical requirements

4.1 Products must comply with the requirements of this standard and be manufactured according to technological documentation approved by the manufacturer.

4.2 Main types and sizes

4.2.1 Products are manufactured in the form of blocks and slabs. Blocks can be manufactured with tongue-and-groove (locking) elements and grip pockets, as well as U-shaped.

Blocks may have technological through or non-through voids. The shape and dimensions of technological voids must correspond to those specified in the working documentation.

4.2.2 Products are manufactured in the maximum dimensions given in Table 1.


Table 1

In millimeters

4.2.3 Depending on the maximum deviations in size, shape and appearance, products are divided into two categories, the requirements for which are given in Table 2.


table 2

In millimeters

4.2.4 The manufacturer, at the request of the consumer, can manufacture products in sizes different from those given in Table 1, taking into account the requirements of Table 2, based on the capabilities of the available equipment.

4.2.5 The symbol of products must consist of the name of the product (block, slab), category designation in accordance with Table 2, dimensions of length, width and height (thickness) in millimeters, grade of average density, class of compressive strength, grade on frost resistance and designations of this standard.

An example of a symbol for a block of category I, length 600, width 300 and height 200 mm, average density grade D500, compressive strength class B2.5, frost resistance grade F25:

Block I/600x300x200/D500/B2.5/F25 GOST 31360-2007

Plate I/1000x600x150/D500/B2.5/F25 GOST 31360-2007

It is allowed to include additional information in the symbol for complete identification of products.

4.3 Characteristics

4.3.1 The following physical, mechanical and thermophysical characteristics are determined for products:

- average density;

- compressive strength;

- thermal conductivity;

- shrinkage upon drying;

- frost resistance;

- vapor permeability.

If necessary, other quality indicators are established in accordance with GOST 4.212 or the terms of the contract.

4.3.2 The manufacturer declares, and the customer selects classes and grades of cellular concrete for the manufacture of products based on average density, compressive strength and frost resistance, as well as cellular concrete with the characteristics of thermal conductivity, drying shrinkage and vapor permeability in accordance with GOST 31359.

4.3.3 Average density

4.3.3.1 The average density grade of cellular concrete products should not be higher than D700.

4.3.3.2 The actual average density of cellular concrete products must correspond to the required one, determined according to GOST 27005 depending on the standardized average density (average density grade) and the actual uniformity of the density of cellular concrete.

4.3.4 Compressive strength

4.3.4.1 The compressive strength class of cellular concrete products must be at least B1.5.

4.3.4.2 The actual strength of cellular concrete products should not be lower than the required strength, determined according to GOST 18105 depending on the standardized strength and the actual uniformity of cellular concrete in strength.

4.3.4.3 Classes for the compressive strength of cellular concrete products are assigned in accordance with the building design standards, depending on the operating conditions of the structures in which these products are used.

4.3.5 Thermal conductivity

For products intended for use in external enclosing structures of buildings and structures with standardized internal microclimate parameters, the thermal conductivity coefficient of cellular concrete products in a dry state should not exceed the values ​​​​established by GOST 31359.

4.3.6 Frost resistance

4.3.6.1 For products subject to alternating freezing and thawing, the grade of cellular concrete is determined by frost resistance in accordance with GOST 31359.

4.3.6.2 The grade of cellular concrete products for frost resistance is assigned depending on the operating conditions of the structure and the estimated winter temperatures of the outside air in the construction area in accordance with the building design standards and is accepted not lower than:

F25 - for products intended for use in external walls;

F15 - for other products.

4.3.7 Drying shrinkage

Shrinkage when drying cellular concrete products should not exceed the values ​​​​established by GOST 31359.

4.3.8 Vapor permeability

The vapor permeability of products is characterized by the vapor permeability coefficient of cellular concrete used for the manufacture of products.

The vapor permeability coefficient of cellular concrete must correspond to those given in GOST 31359.

4.3.9 The specific effective activity of natural radionuclides in products should not exceed 370 Bq/kg in accordance with GOST 30108.

4.4 Fire technical characteristics

The products belong to the group of non-combustible materials (NG) in accordance with GOST 30244.

4.5 Material requirements

4.5.1 For the manufacture of products, structural and thermal insulating cellular concrete must be used in accordance with GOST 31359.

4.6 Marking

4.6.1 Product marking - in accordance with GOST 13015 with the following additions.

4.6.2 Marking is applied to each packaging unit. Markings must be legible and weather-resistant.

4.6.3 Marking must contain:

- trademark or name of the manufacturer;

- class of cellular concrete products in terms of compressive strength;

- brand of cellular concrete products based on medium density;

- brand of cellular concrete products for frost resistance;

- batch number;

- a mark on passing technical control.

4.6.4 Transport marking - according to GOST 14192.

4.7 Packaging

4.7.1 Products are placed on pallets in accordance with GOST 18343 and secured using shrink film, bandaging with polyester or steel tape in accordance with GOST 3560 or in another way that ensures immobility and safety of products during transportation.

4.7.2 By agreement with the consumer, other types of packaging are allowed to ensure the safety of products during transportation.

5 Safety and environmental requirements

5.1 When processing products with tools and mechanisms that cause increased dust formation (wall cutters, grinders, etc.), it is necessary to take measures to protect the respiratory system and skin.

5.2 Waste generated during the manufacture or use of products must be disposed of in accordance with current legislation in the field of environmental protection.

6 Acceptance rules

6.1 Acceptance of products is carried out in accordance with the requirements of GOST 13015, this standard, as well as the contract for the manufacture (supply) of products.

6.2 Products are accepted in batches. A batch is considered to be the number of products made from the same raw material, using the same technology, the same brand in terms of average density, the same class in terms of compressive strength, in a volume of no less than a shift, but not more than a daily production or order. The supply contract may specify a different batch size.

6.3 The manufacturer is responsible for compliance of product quality with the requirements of this standard.

Product quality is ensured by:

- incoming inspection of raw materials used for the manufacture of products;

- operational production (technological) control;

- acceptance control of finished products;

- constantly carried out statistical factory quality control of products.

Acceptance control includes acceptance and periodic tests carried out in accordance with Table 3.


Table 3

6.4 The manufacturer carries out additional tests of products according to quality indicators not established by this standard, based on the intended purpose of the product within the time period agreed with the consumer.

6.5 For testing, at least 12 products are selected at random from different places in the batch. If more than three products from the specified number do not meet the requirements of this standard in size, appearance and shape, 24 products are selected from the lot.

If more than six products do not meet the requirements of this standard in size, appearance and shape, a complete control of the batch of products is carried out according to these indicators.

6.6 If the results of acceptance tests of products according to physical and mechanical parameters are satisfactory, the batch is accepted.

In case of unsatisfactory results of acceptance tests of products based on physical and mechanical indicators, the stability of the technological process at the enterprise is assessed for the period during which unsatisfactory results were obtained, in accordance with the technological regulations.

6.7 The results of periodic tests are applied to all supplied batches of products until the next periodic tests are carried out.

6.8 The specific effective activity of natural radionuclides of products is monitored during incoming inspection according to the documents of the enterprise - supplier of raw materials. In the absence of data from the supplier of raw materials on the value, testing for this indicator should be carried out at least once a year and each time the supplier of raw materials changes in accredited testing laboratories.

6.9 When organizing the production of products, changing the supplier of raw materials and before offering products for sale, tests are carried out to prove compliance of the quality of products with the requirements of this standard, including in terms of changed properties.

The rules for selecting products for testing during production organization and independent control are given in Appendix A.

6.10 When testing products by the consumer, inspection control and certification tests, the sample size and rules for assessing control results are taken in accordance with the requirements of this section, using control methods in section 7.

In case of disagreement, a control check is carried out in the presence of a representative of the manufacturer. The list of controlled parameters is established by agreement of the parties.

6.11 The manufacturer must carry out quality control of materials and semi-finished products supplied to the enterprise and operational control of the production process. If significant changes occur in the source materials or the production process, which may lead to a deterioration in the quality of the finished product, then after eliminating these changes, the products are tested for all indicators in accordance with the requirements of this standard.

6.12 To assess the stability of the technological process at the enterprise, the results of quality control of finished products are subjected to statistical processing on a monthly basis and compliance with the requirements of the technological regulations is established.

6.13 The consumer has the right to check the compliance of the products specified in the order with the requirements of this standard, applying the control procedure established by this standard. Products are checked for appearance indicators before shipment from the manufacturer.

6.14 Each batch of products is accompanied by a quality document, which indicates:

- name and address of the manufacturer;

- purpose of products;

- symbol of products;

- volume of the supplied lot, m;

- product sizes;

- compressive strength class;

- medium density grade;

- frost resistance grade;

- specific effective activity of natural radionuclides;

- thermal conductivity coefficient of products in a dry state;

- shrinkage upon drying;

- coefficient of vapor permeability;

- number and date of issue of the quality document;

- batch number;

- designation of this standard.

..

7.8 The specific effective activity of natural radionuclides is determined according to GOST 30108.

7.9 It is allowed to use other methods when conducting tests (with the exception of tests when putting products into production and in case of disagreements between interested parties), provided that these methods meet the following conditions:

- the presence of a correlation between the results obtained by the main and alternative methods;

- availability of verification of information that is the basis for such communication.

8 Transportation and storage

8.1 Loading into vehicles and transportation of products is carried out in accordance with the rules for the transportation of goods in force for a particular type of transport.

Products are transported in transport packages formed using pallets and fastening agents.

8.2 When transporting products, the products must be protected from mechanical damage and moisture.

8.3 Products must be stored by the manufacturer and consumer on level, prepared areas on linings or pallets in conditions that prevent the products from getting wet.

8.4 When monitoring the storage of products in a finished product warehouse, they check the correct sorting of products by type, category, brand according to average density, the height of the stack of products in accordance with the technological regulations, as well as the implementation of measures to protect products from mechanical damage and moisture.

8.5 Products are placed in stacks during storage. The height of the stack should ensure the safety of products.

8.6 Loading and unloading of products from vehicles must be carried out mechanically using special load-handling devices or in another way that prevents damage to the products.

Loading products in bulk and unloading them by dumping are not allowed.

8.7 The consumer is responsible for incorrect transportation, unloading and storage at the construction site.

9 Directions for use

9.1 Products are used in accordance with the requirements of current building codes, codes of practice or design documentation.

9.2 When installing products with the maximum dimensions established in 4.2.2, small-scale mechanization should be used.

Appendix A (mandatory). Rules for selecting products for control during production organization and independent control tests

Appendix A
(required)

A.1 When organizing the production of products and during independent control tests, the physical, mechanical and thermophysical characteristics of the products are assessed in accordance with this standard and declared by the manufacturer.

A.2 Representatives of all interested parties can participate in the selection of controlled products and conducting control tests.

A.3 At least 12 products are selected for testing.

The number of samples for testing is taken according to Table A.1. Sampling is carried out no earlier than 12 hours after the end of autoclave processing and unloading of products from the autoclave.


Table A.1

A.4 The following methods for selecting products are used: random sampling, representative sampling, sampling of products from a stack.

A.5 Random sampling is carried out in a manner in which all items have an equal probability of being selected for the sample. The required number of products is selected randomly, without paying attention to the appearance of the selected products, with the exception of products damaged during transportation, which are not allowed to be selected.

Note - Selection of products in the above manner is possible if the products making up the sample are transported unpackaged or if they are divided into a large number of small piles before they are used.

A.6 If it is impossible to randomly select products, if there is access to a limited number of products, the representative selection method is used. The stack is divided into at least six parts of equal size. From each part, an equal number of products are selected by random selection, but no more than four, so that a sample of the required size is obtained, without paying attention to the appearance of the products, with the exception of products damaged during transportation, which are not allowed to be selected.

Note - When selecting products, some parts of the stack should be moved aside to provide access to the products located inside the stack.

A.7 When selecting products from a stack consisting of packaged products, select at least six packages, from each of which an equal number of randomly selected products are selected, but not more than four, so that a sample of the required size is obtained, without paying attention to the appearance of the products , with the exception of products damaged during transportation, which are not allowed to be taken away.

A.8 If the selected items are used in more than one test, the sample is divided into parts depending on the number of items used in a particular test.



Electronic document text
prepared by Kodeks JSC and verified against:
official publication
M.: Standartinform, 2008

Cellular concrete (aerated concrete) is a lightweight porous autoclave-hardening material produced using German equipment, which ensures high accuracy of geometric dimensions and allows walls to be laid using glue.

The blocks are intended for laying external and internal walls and partitions during the construction of multi-storey frame-type buildings, 1-3 storey houses, cottages, garages, and outbuildings.

Advantages:

• Ease aerated concrete allows you to reduce transportation and installation costs, reduce the labor intensity of work, because Instead of 16 bricks, it is enough to lay 1 block.
• High thermal insulation. When building housing, the thickness of the outer wall made of brick should be more than 1500 mm, and of cellular concrete 400-600 mm. The thermal insulation properties of aerated concrete allow significant savings on heating energy.
• Machinability. The blocks are well sawn, drilled and nailed. Ease of processing allows you to manufacture structures of any configuration, including arched ones, cut channels and holes for electrical wiring, sockets, and pipelines.
• Frost resistance. Cellular aerated concrete can withstand up to 50 cycles of alternating freezing and thawing.
• Fire safety. Cellular concrete is a non-combustible material. It effectively prevents the spread of fire and can be used for all fire safety classes.
• Environmental friendliness. Aerated concrete does not rot and does not age. It is created from environmentally friendly materials (sand, cement, lime, gas-forming substance). Cellular concrete is second only to wood in its environmental friendliness.

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INTERSTATE COUNCIL FOR STANDARDIZATION, METROLOGY AND CERTIFICATION
(MGS)

INTERSTATE COUNCIL FOR STANDARDIZATION, METROLOGY AND CERTIFICATION
(ISC)

UNREINFORCED WALL PRODUCTS
FROM CELLULAR CONCRETE
AUTOCLAVE HARDENING

Specifications

Interstate Scientific and Technical Commission
on standardization, technical regulation
and certification in construction
(MNTKS)
2008

Preface

The goals, basic principles and basic procedure for carrying out work on interstate standardization are established by GOST 1.0-92 “Interstate standardization system. Basic provisions" and MSN 1.01-01-96 "System of interstate regulatory documents in construction. Basic provisions"

Standard information

1 DEVELOPED by the Institute of Reinforced Concrete Construction - a branch of the Federal State Unitary Enterprise "National Research Center Construction" with the participation of the TsNIISK im. Kucherenko, MGSU, VGASU (Voronezh), OJSC "LZID" (Lipetsk), OJSC "NLMK" (Lipetsk), LLC "AEROC" (St. Petersburg), OJSC "LKSI" (Voronezh). Lipetsk), 000 "Reftinsky association "Teplit" (Sverdlovsk region), OJSC "Glavnovosibirskstroy", OJSC "Cottage" (Samara), FSUE "211 KZhBI" (Leningrad region)

2 INTRODUCED by the Technical Committee for Standardization TK465 “Construction”

3 ADOPTED by the Interstate Scientific and Technical Commission for Standardization, Technical Regulation and Certification in Construction (MNTKS) (Minutes No. 32 of November 21, 2007)

4 This standard corresponds to the European standard EN 771-4:2003 “Specification of wall blocks. Part 4: Autoclaved aerated concrete blocks" (EN 771-4:2003 "Specification for masonry units. Part 4: Autoclaved aerated concrete masonry units") regarding the conformity assessment of the quality of products made from cellular concrete

5 By Order of the Federal Agency for Technical Regulation and Metrology dated May 21, 2008 No. 109-st, the interstate standard GOST 31360-2007 was put into effect as a national standard of the Russian Federation on January 1, 2009.

INTERSTATE STANDARD

Date of introduction - 2009-01-01

1 area of ​​use

This standard applies to non-reinforced wall products made from autoclaved cellular structural heat-insulating concrete (hereinafter referred to as products), intended for use as load-bearing and self-supporting elements in the external walls of buildings and structures with dry, normal and wet operating modes in a non-aggressive environment, as well as for internal walls and partitions in rooms with a relative air humidity of no more than 75% and a non-aggressive environment. When the relative air humidity is more than 75%, the internal surfaces of the external walls of the products must have a vapor barrier coating.

This standard establishes technical requirements, test methods and assessment of product quality compliance with this standard based on test results.

Note - Reinforced products made of autoclaved cellular concrete are manufactured in accordance with GOST 19010.

2 Normative references

Plate I / 1000´600´150 / D500 / B2.5 / F25 GOST 31360-2007

It is allowed to include additional information in the symbol for complete identification of products.

4.3 Characteristics

4.3.1 The following physical, mechanical and thermophysical characteristics are determined for products:

Medium density;

Compressive strength;

Thermal conductivity;

Shrinkage when drying;

Frost resistance;

Vapor permeability.

If necessary, other quality indicators are established in accordance with GOST 4.212 or the terms of the contract.

4.3.2 The manufacturer declares, and the customer selects classes and grades of cellular concrete for the manufacture of products based on average density, compressive strength and frost resistance, as well as cellular concrete with the characteristics of thermal conductivity, drying shrinkage and vapor permeability in accordance with GOST 31359.

4.3.3 Average density

4.3.3.1 The average density grade of cellular concrete products should not be higher than D700.

4.3.3.2 The actual average density of cellular concrete products must correspond to the required one, determined according to GOST 27005 depending on the standardized average density (average density grade) and the actual uniformity of the density of cellular concrete.

4.3.4 Compressive strength

4.3.4.1 The compressive strength class of cellular concrete products must be at least B1.5.

4.3.4.2 The actual strength of cellular concrete products should not be lower than the required strength, determined according to GOST 18105 depending on the standardized strength and the actual uniformity of cellular concrete in strength.

4.3.4.3 Classes for the compressive strength of cellular concrete products are assigned in accordance with the building design standards, depending on the operating conditions of the structures in which these products are used.

4.3.5 Thermal conductivity

For products intended for use in external enclosing structures of buildings and structures with standardized internal microclimate parameters, the thermal conductivity coefficient of cellular concrete products in a dry state should not exceed the values ​​​​established by GOST 31359.

4.3.6 Frost resistance

4.3.6.1 For products subject to alternating freezing and thawing, the grade of cellular concrete is determined by frost resistance in accordance with GOST 31359.

4.3.6.2 The grade of cellular concrete products for frost resistance is assigned depending on the operating conditions of the structure and the estimated winter temperatures of the outside air in the construction area in accordance with the building design standards and is accepted not lower than:

F25 - for products intended for use in external walls;

F15 - for other products.

4.3.7 Drying shrinkage

Shrinkage when drying cellular concrete products should not exceed the values ​​​​established by GOST 31359.

4.3.8 Vapor permeability

The vapor permeability of products is characterized by the vapor permeability coefficient of cellular concrete used for the manufacture of products.

The vapor permeability coefficient of cellular concrete must correspond to those given in GOST 31359.

4.3.9 The specific effective activity of natural radionuclides in products should not exceed 370 Bq/kg in accordance with GOST 30108.

4.4 Fire technical characteristics

The products belong to the group of non-combustible materials (NG) in accordance with GOST 30244.

4.5 Material requirements

4.5.1 For the manufacture of products, structural and thermal insulating cellular concrete must be used in accordance with GOST 31359.

4.6 Marking

4.7 Packaging

4.7.1 Products are placed on pallets in accordance with GOST 18343 and secured using shrink film, bandaging with polyester or steel tape in accordance with GOST 3560 or in another way that ensures immobility and safety of products during transportation.

4.7.2 By agreement with the consumer, other types of packaging are allowed to ensure the safety of products during transportation.

5 Safety and environmental requirements

5.1 When processing products with tools and mechanisms that cause increased dust formation (wall cutters, grinders, etc.), it is necessary to take measures to protect the respiratory system and skin.

5.2 Waste generated during the manufacture or use of products must be disposed of in accordance with current legislation in the field of environmental protection.

6 Acceptance rules

6.1 Acceptance of products is carried out in accordance with the requirements of GOST 13015, this standard, as well as the contract for the manufacture (supply) of products.

6.2 Products are accepted in batches. A batch is considered to be the number of products made from the same raw material, using the same technology, the same brand in terms of average density, the same class in terms of compressive strength, in a volume of no less than a shift, but not more than a daily production or order. The supply contract may specify a different batch size.

6.3 The manufacturer is responsible for compliance of product quality with the requirements of this standard.

Product quality is ensured by:

Incoming inspection of raw materials used for the manufacture of products;

Operational production (technological) control;

Acceptance control of finished products;

Constantly carried out statistical factory quality control of products. Acceptance control includes acceptance and periodic tests carried out in accordance with Table 3.

Table 3

6.4 The manufacturer carries out additional tests of products according to quality indicators not established by this standard, based on the intended purpose of the product, within the time limits agreed with the consumer.

6.5 For testing, at least 12 products are selected at random from different places in the batch. If more than three products from the specified number do not meet the requirements of this standard in size, appearance and shape, 24 products are selected from the lot.

If more than six products do not meet the requirements of this standard in size, appearance and shape, a complete control of the batch of products is carried out according to these indicators.

6.6 If the results of acceptance tests of products according to physical and mechanical parameters are satisfactory, the batch is accepted.

In case of unsatisfactory results of acceptance tests of products based on physical and mechanical indicators, the stability of the technological process at the enterprise is assessed for the period during which unsatisfactory results were obtained, in accordance with the technological regulations.

6.7 The results of periodic tests are applied to all supplied batches of products until the next periodic tests are carried out.

6.8 Specific effective activity of natural radionuclides A uh ff products are controlled during incoming inspection according to the documents of the enterprise - supplier of raw materials. In the absence of data from the supplier of raw materials on the value A eff testing for this indicator should be carried out at least once a year and every time the supplier of raw materials is changed in accredited testing laboratories.

6.9 When organizing the production of products, changing the supplier of raw materials and before offering products for sale, tests are carried out to prove compliance of the quality of products with the requirements of this standard, including in terms of changed properties.

The rules for selecting products for testing during production organization and independent control are given in Appendix A.

6.10 When testing products by the consumer, inspection control and certification tests, the sample size and rules for assessing control results are taken in accordance with the requirements of this section, using control methods in section 7.

In case of disagreement, a control check is carried out in the presence of a representative of the manufacturer. The list of controlled parameters is established by agreement of the parties.

6.11 The manufacturer must carry out quality control of materials and semi-finished products supplied to the enterprise and operational control of the production process. If significant changes occur in the source materials or the production process, which may lead to a deterioration in the quality of the finished product, then after eliminating these changes, the products are tested for all indicators in accordance with the requirements of this standard.

6.12 To assess the stability of the technological process at the enterprise, the results of quality control of finished products are subjected to statistical processing on a monthly basis and compliance with the requirements of the technological regulations is established.

6.13 The consumer has the right to check the compliance of the products specified in the order with the requirements of this standard, applying the control procedure established by this standard. Products are checked for appearance indicators before shipment from the manufacturer.

6.14 Each batch of products is accompanied by a quality document, which indicates:

Name and address of the manufacturer;

Purpose of products;

Product designation;

Volume of the supplied batch, m 3 ;

Product sizes;

Compressive strength class;

Medium density brand;

Frost resistance grade;

Specific effective activity of natural radionuclides;

Thermal conductivity coefficient of products in a dry state;

Shrinkage when drying;

Vapor permeability coefficient;

Number and date of issue of the quality document;

Batch number;

Designation of this standard.

7 Test methods

7.1 The dimensions and straightness of the ribs are determined according to GOST 26433.1. The depth of broken corners and edges is determined by.

7.6 Frost resistance is determined according to GOST 31359, Appendix B.

7.7 Vapor permeability is determined according to GOST 25898.

7.8 The specific effective activity of natural radionuclides is determined according to GOST 30108.

7.9 It is allowed to use other methods when conducting tests (with the exception of tests when putting products into production and in case of disagreements between interested parties), provided that these methods meet the following conditions:

The presence of a correlation between the results obtained by the main and alternative methods;

Availability of verification of information that is the basis for such communication.

8 Transportation and storage

8.1 Loading into vehicles and transportation of products is carried out in accordance with the rules for the transportation of goods in force for a particular type of transport.

Products are transported in transport packages formed using pallets and fastening agents.

8.2 When transporting products, the products must be protected from mechanical damage and moisture.

8.3 Products must be stored by the manufacturer and consumer on level, prepared areas on linings or pallets in conditions that prevent the products from getting wet.

8.4 When monitoring the storage of products in a finished product warehouse, they check the correct sorting of products by type, category, brand according to average density, the height of the stack of products in accordance with the technological regulations, as well as the implementation of measures to protect products from mechanical damage and moisture.

8.5 Products are placed in stacks during storage. The height of the stack should ensure the safety of products.

8.6 Loading and unloading of products from vehicles must be carried out mechanically using special load-handling devices or in another way that prevents damage to the products.

Loading products in bulk and unloading them by dumping are not allowed.

8.7 The consumer is responsible for incorrect transportation, unloading and storage at the construction site.

9 Directions for use

9.1 Products are used in accordance with the requirements of current building codes, codes of practice or design documentation.

9.2 When installing products with the maximum dimensions established in 4.2.2, small-scale mechanization should be used.

Appendix A
(required)

Rules for selecting products for control when organizing production
and independent control tests

A.1 When organizing the production of products and during independent control tests, the physical, mechanical and thermophysical characteristics of the products are assessed in accordance with this standard and declared by the manufacturer.

A.2 Representatives of all interested parties can participate in the selection of controlled products and conducting control tests.

A.3 At least 12 products are selected for testing.

The number of samples for testing is taken according to Table A.1. Sampling is carried out no earlier than 12 hours after the end of autoclave processing and unloading of products from the autoclave.

Table A.1

A.4 The following methods for selecting products are used: random sampling, representative sampling, sampling of products from a stack.

A.5 Random sampling is carried out in a manner in which all items have an equal probability of being selected for the sample. The required number of products is selected randomly, without paying attention to the appearance of the selected products, with the exception of products damaged during transportation, which are not allowed to be selected.

Note - Selection of products in the above manner is possible if the products making up the sample are transported unpackaged or if they are divided into a large number of small piles before they are used.

A.6 If it is impossible to randomly select products, if there is access to a limited number of products, the representative selection method is used. The stack is divided into at least six parts of equal size. From each part, an equal number of products are selected by random selection, but no more than four, so that a sample of the required size is obtained, without paying attention to the appearance of the products, with the exception of products damaged during transportation, which are not allowed to be selected.

Note - When selecting products, some parts of the stack should be moved aside to provide access to the products located inside the stack.

A.7 When selecting products from a stack consisting of packaged products, select at least six packages, from each of which an equal number of randomly selected products are selected, but not more than four, so that a sample of the required size is obtained, without paying attention to the appearance of the products , with the exception of products damaged during transportation, which are not allowed to be taken away.

A.8 If the selected items are used in more than one test, the sample is divided into parts depending on the number of items used in a particular test.

Keywords: autoclaved cellular concrete, non-reinforced wall products, external walls of buildings and structures, internal walls and partitions, technical requirements, acceptance rules, test methods

GOST 31360-2007

Group Zh33

INTERSTATE STANDARD

UNREINFORCED WALL PRODUCTS
AUTOCLAVED CELLULAR CONCRETE

Specifications

Wall unreinforced products of cellular autoclave curing concrete.
Specifications

ISS 91.100.30
OKP 57 4140

Date of introduction 2009-01-01

Preface

The goals, basic principles and basic procedure for carrying out work on interstate standardization have been established GOST 1.0-92"Interstate standardization system. Basic provisions" and MSN 1.01-01-96* "System of interstate regulatory documents in construction. Basic provisions"
_______________
* The document was not accepted on the territory of the Russian Federation. Valid until 01.10.2003 SNiP 10-01-94. - Database manufacturer's note.


Standard information

1 DEVELOPED by the Institute of Reinforced Concrete Construction - a branch of the Federal State Unitary Enterprise "National Research Center Construction" with the participation of the TsNIISK im. Kucherenko, MGSU, VGASU (Voronezh), JSC "LZID" (Lipetsk), JSC "NLMK" (Lipetsk), LLC "AEROC" (St. Petersburg), JSC "LKSI" (St. Lipetsk), LLC "Reftinsky Association "Teplit" (Sverdlovsk region), JSC "Glavnovosibirskstroy", JSC "Cottage" (Samara), Federal State Unitary Enterprise "211 KZHBI" (Leningrad region)

2 INTRODUCED by the Technical Committee for Standardization TC 465 "Construction"

3 ADOPTED by the Interstate Scientific and Technical Commission for Standardization, Technical Regulation and Certification in Construction (MNTKS) (Minutes No. 32 of November 21, 2007)

The following voted for adoption:

4 This standard is in accordance with the European standard EN 771-4:2003 "Specification for masonry units. Part 4: Autoclaved aerated concrete masonry units" in terms of assessing the conformity of the quality of products made from cellular concrete

5 By order of the Federal Agency for Technical Regulation and Metrology of May 21, 2008 N 109-st interstate standard GOST 31360-2007 came into force as a national standard of the Russian Federation on January 1, 2009.

6 IN REPLACE GOST 21520-89 regarding products made from autoclaved cellular concrete


Information on the entry into force (termination) of this standard is published in the “National Standards” index.

Information about changes to this standard is published in the “National Standards” index, and the text of the changes is published in the “National Standards” information indexes. In case of revision or cancellation of this standard, the relevant information will be published in the information index "National Standards"

1 area of ​​use

1 area of ​​use

This standard applies to non-reinforced wall products made from autoclaved cellular structural heat-insulating concrete (hereinafter referred to as products), intended for use as load-bearing and self-supporting elements in the external walls of buildings and structures with dry, normal and wet operating modes in a non-aggressive environment, as well as for internal walls and partitions in rooms with a relative air humidity of no more than 75% and a non-aggressive environment. When the relative air humidity is more than 75%, the internal surfaces of the external walls of the products must have a vapor barrier coating.

This standard establishes technical requirements, test methods and assessment of product quality compliance with this standard based on test results.

Note - Reinforced products made of autoclaved cellular concrete are manufactured in accordance with GOST 19010.

2 Normative references

This standard uses references to the following interstate standards:

GOST 4.212-80 System of product quality indicators. Construction. Concrete. Nomenclature of indicators

GOST 3560-73 Steel packaging tape. Specifications

GOST 7076-99 Construction materials and products. Method for determining thermal conductivity and thermal resistance under stationary thermal conditions

GOST 7502-98 Metal measuring tapes. Specifications

GOST 10180-90 Methods for determining strength using control samples

GOST 12730.1-78 Concrete. Density determination method

GOST 13015-2003 Reinforced concrete and concrete products for construction. General technical requirements. Rules for acceptance, labeling, transportation and storage

GOST 14192-96 Marking of cargo

GOST 18105-86 Concrete. Strength control rules

GOST 18343-80 Pallets for bricks and ceramic stones. Specifications

GOST 19010-82 Concrete and reinforced concrete wall blocks for buildings. General technical conditions

GOST 21520-89 Small blocks made of cellular concrete for walls. Specifications

GOST 24104-2001 Laboratory scales. General technical requirements

GOST 25485-86 Cellular concrete. Specifications*
_______________
*Probably an error in the original. Should read GOST 25485-89 Cellular concrete. Specifications, hereinafter in the text. - Database manufacturer's note.

GOST 25898-83 Construction materials and products. Methods for determining vapor permeation resistance

GOST 26433.1-89 System for ensuring the accuracy of geometric parameters in construction. Rules for performing measurements. Factory-made elements

GOST 27005-86 Lightweight and cellular concrete. Average Density Control Rules

GOST 27006-86 Concrete. Squad selection rules

GOST 30244-94 Construction materials. Flammability test methods

GOST 30108-94 Construction materials and products. Determination of specific effective activity of natural radionuclides

GOST 31359-2007 Autoclave-hardening cellular concrete. Specifications

Note - When using this standard, it is advisable to check the validity of the reference standards using the “National Standards” index compiled as of January 1 of the current year, and according to the corresponding information indexes published in the current year. If the reference standard is replaced (changed), then when using this standard you should be guided by the replacing (changed) standard. If the reference standard is canceled without replacement, then the provision in which a reference is made to it is applied in the part that does not affect this reference.

3 Terms and definitions

The following terms with corresponding definitions are used in this standard:

3.1 block: A product with a usually rectangular cross-section and a thickness slightly less than its width.

3.2 plate: A product with a rectangular cross-section, the thickness of which is significantly less than other dimensions and is constant throughout the product.

3.3 U-shape block: A product with a recess in the bed surface running parallel to a larger linear dimension of the product.

3.4 Grip pockets: Non-through recesses in the end surface of products intended for manual carrying of products.

3.5 technological void: A through or non-through cavity molded or drilled into a product.

3.6 nominal size: The standardized size of a product, the actual size of which corresponds to the limits of permissible deviations.

4 Technical requirements

4.1 Products must comply with the requirements of this standard and be manufactured according to technological documentation approved by the manufacturer.

4.2 Main types and sizes

4.2.1 Products are manufactured in the form of blocks and slabs. Blocks can be manufactured with tongue-and-groove (locking) elements and grip pockets, as well as U-shaped.

Blocks may have technological through or non-through voids. The shape and dimensions of technological voids must correspond to those specified in the working documentation.

4.2.2 Products are manufactured in the maximum dimensions given in Table 1.


Table 1

In millimeters

4.2.3 Depending on the maximum deviations in size, shape and appearance, products are divided into two categories, the requirements for which are given in Table 2.


table 2

In millimeters

4.2.4 The manufacturer, at the request of the consumer, can manufacture products in sizes different from those given in Table 1, taking into account the requirements of Table 2, based on the capabilities of the available equipment.

4.2.5 The symbol of products must consist of the name of the product (block, slab), category designation in accordance with Table 2, dimensions of length, width and height (thickness) in millimeters, grade of average density, class of compressive strength, grade on frost resistance and designations of this standard.

An example of a symbol for a block of category I, length 600, width 300 and height 200 mm, average density grade D500, compressive strength class B2.5, frost resistance grade F25:

Block I/600x300x200/D500/B2.5/F25 GOST 31360-2007

Plate I/1000x600x150/D500/B2.5/F25 GOST 31360-2007

It is allowed to include additional information in the symbol for complete identification of products.

4.3 Characteristics

4.3.1 The following physical, mechanical and thermophysical characteristics are determined for products:

- average density;

- compressive strength;

- thermal conductivity;

- shrinkage upon drying;

- frost resistance;

- vapor permeability.

If necessary, set other quality indicators in accordance with GOST 4.212 or the terms of the contract.

4.3.2 The manufacturer declares, and the customer selects classes and grades of cellular concrete for the manufacture of products based on average density, compressive strength and frost resistance, as well as cellular concrete with characteristics of thermal conductivity, drying shrinkage and vapor permeability according to GOST 31359.

4.3.3 Average density

4.3.3.1 The average density grade of cellular concrete products should not be higher than D700.

4.3.3.2 The actual average density of cellular concrete products must correspond to the required one, determined by GOST 27005 depending on the standardized average density (average density grade) and the actual uniformity of the density of cellular concrete.

4.3.4 Compressive strength

4.3.4.1 The compressive strength class of cellular concrete products must be at least B1.5.

4.3.4.2 The actual strength of cellular concrete products should not be lower than the required strength, determined by GOST 18105 depending on the standardized strength and the actual strength uniformity of cellular concrete.

4.3.4.3 Classes for the compressive strength of cellular concrete products are assigned in accordance with the building design standards, depending on the operating conditions of the structures in which these products are used.

4.3.5 Thermal conductivity

For products intended for use in external enclosing structures of buildings and structures with standardized internal microclimate parameters, the thermal conductivity coefficient of cellular concrete products in a dry state should not exceed the values ​​​​established GOST 31359.

4.3.6 Frost resistance

4.3.6.1 For products subject to alternating freezing and thawing, the grade of cellular concrete is determined by frost resistance in accordance with GOST 31359.

4.3.6.2 The grade of cellular concrete products for frost resistance is assigned depending on the operating conditions of the structure and the estimated winter temperatures of the outside air in the construction area in accordance with the building design standards and is accepted not lower than:

F25 - for products intended for use in external walls;

F15 - for other products.

4.3.7 Drying shrinkage

Shrinkage when drying cellular concrete products should not exceed the values ​​​​established GOST 31359.

4.3.8 Vapor permeability

The vapor permeability of products is characterized by the vapor permeability coefficient of cellular concrete used for the manufacture of products.

The vapor permeability coefficient of cellular concrete must correspond to those given in GOST 31359.

4.3.9 The specific effective activity of natural radionuclides in products should not exceed 370 Bq/kg in accordance with GOST 30108.

4.4 Fire technical characteristics

The products belong to the group of non-combustible materials (NG) in accordance with GOST 30244.

4.5 Material requirements

4.5.1 For the manufacture of products, structural and thermal insulating cellular concrete should be used according to GOST 31359.

4.6 Marking

4.6.1 Product marking - by GOST 13015 with the following additions.

4.6.2 Marking is applied to each packaging unit. Markings must be legible and weather-resistant.

4.6.3 Marking must contain:

- trademark or name of the manufacturer;

- class of cellular concrete products in terms of compressive strength;

- brand of cellular concrete products based on medium density;

- brand of cellular concrete products for frost resistance;

- batch number;

- a mark on passing technical control.

4.6.4 Transport marking - according to GOST 14192.

4.7 Packaging

4.7.1 Products are placed on pallets according to GOST 18343 and fixed using shrink film, ligating with polyester or steel tape along GOST 3560 or in another way that ensures the immobility and safety of products during transportation.

4.7.2 By agreement with the consumer, other types of packaging are allowed to ensure the safety of products during transportation.

5 Safety and environmental requirements

5.1 When processing products with tools and mechanisms that cause increased dust formation (wall cutters, grinders, etc.), it is necessary to take measures to protect the respiratory system and skin.

5.2 Waste generated during the manufacture or use of products must be disposed of in accordance with current legislation in the field of environmental protection.

6 Acceptance rules

6.1 Acceptance of products is carried out in accordance with the requirements GOST 13015, this standard, as well as the contract for the manufacture (supply) of products.

6.2 Products are accepted in batches. A batch is considered to be the number of products made from the same raw material, using the same technology, the same brand in terms of average density, the same class in terms of compressive strength, in a volume of no less than a shift, but not more than a daily production or order. The supply contract may specify a different batch size.

6.3 The manufacturer is responsible for compliance of product quality with the requirements of this standard.

Product quality is ensured by:

- incoming inspection of raw materials used for the manufacture of products;

- operational production (technological) control;

- acceptance control of finished products;

- constantly carried out statistical factory quality control of products.

Acceptance control includes acceptance and periodic tests carried out in accordance with Table 3.


Table 3

6.4 The manufacturer carries out additional tests of products according to quality indicators not established by this standard, based on the intended purpose of the product within the time period agreed with the consumer.

6.5 For testing, at least 12 products are selected at random from different places in the batch. If more than three products from the specified number do not meet the requirements of this standard in size, appearance and shape, 24 products are selected from the lot.

If more than six products do not meet the requirements of this standard in size, appearance and shape, a complete control of the batch of products is carried out according to these indicators.

6.6 If the results of acceptance tests of products according to physical and mechanical parameters are satisfactory, the batch is accepted.

In case of unsatisfactory results of acceptance tests of products based on physical and mechanical indicators, the stability of the technological process at the enterprise is assessed for the period during which unsatisfactory results were obtained, in accordance with the technological regulations.

6.7 The results of periodic tests are applied to all supplied batches of products until the next periodic tests are carried out.

6.8 The specific effective activity of natural radionuclides of products is monitored during incoming inspection according to the documents of the enterprise - supplier of raw materials. In the absence of data from the supplier of raw materials on the value, testing for this indicator should be carried out at least once a year and each time the supplier of raw materials changes in accredited testing laboratories.

6.9 When organizing the production of products, changing the supplier of raw materials and before offering products for sale, tests are carried out to prove compliance of the quality of products with the requirements of this standard, including in terms of changed properties.

The rules for selecting products for testing during production organization and independent control are given in Appendix A.

6.10 When testing products by the consumer, inspection control and certification tests, the sample size and rules for assessing control results are taken in accordance with the requirements of this section, using control methods in section 7.

In case of disagreement, a control check is carried out in the presence of a representative of the manufacturer. The list of controlled parameters is established by agreement of the parties.

6.11 The manufacturer must carry out quality control of materials and semi-finished products supplied to the enterprise and operational control of the production process. If significant changes occur in the source materials or the production process, which may lead to a deterioration in the quality of the finished product, then after eliminating these changes, the products are tested for all indicators in accordance with the requirements of this standard.

6.12 To assess the stability of the technological process at the enterprise, the results of quality control of finished products are subjected to statistical processing on a monthly basis and compliance with the requirements of the technological regulations is established.

6.13 The consumer has the right to check the compliance of the products specified in the order with the requirements of this standard, applying the control procedure established by this standard. Products are checked for appearance indicators before shipment from the manufacturer.

6.14 Each batch of products is accompanied by a quality document, which indicates:

- name and address of the manufacturer;

- purpose of products;

- symbol of products;

- volume of the supplied lot, m;

- product sizes;

- compressive strength class;

- medium density grade;

- frost resistance grade;

- specific effective activity of natural radionuclides;

- thermal conductivity coefficient of products in a dry state;

- shrinkage upon drying;

- coefficient of vapor permeability;

- number and date of issue of the quality document;

- batch number;

- designation of this standard.

..

7.8 The specific effective activity of natural radionuclides is determined by GOST 30108.

7.9 It is allowed to use other methods when conducting tests (with the exception of tests when putting products into production and in case of disagreements between interested parties), provided that these methods meet the following conditions:

- the presence of a correlation between the results obtained by the main and alternative methods;

- availability of verification of information that is the basis for such communication.

8 Transportation and storage

8.1 Loading into vehicles and transportation of products is carried out in accordance with the rules for the transportation of goods in force for a particular type of transport.

Products are transported in transport packages formed using pallets and fastening agents.

8.2 When transporting products, the products must be protected from mechanical damage and moisture.

8.3 Products must be stored by the manufacturer and consumer on level, prepared areas on linings or pallets in conditions that prevent the products from getting wet.

8.4 When monitoring the storage of products in a finished product warehouse, they check the correct sorting of products by type, category, brand according to average density, the height of the stack of products in accordance with the technological regulations, as well as the implementation of measures to protect products from mechanical damage and moisture.

8.5 Products are placed in stacks during storage. The height of the stack should ensure the safety of products.

8.6 Loading and unloading of products from vehicles must be carried out mechanically using special load-handling devices or in another way that prevents damage to the products.

Loading products in bulk and unloading them by dumping are not allowed.

8.7 The consumer is responsible for incorrect transportation, unloading and storage at the construction site.

9 Directions for use

9.1 Products are used in accordance with the requirements of current building codes, codes of practice or design documentation.

9.2 When installing products with the maximum dimensions established in 4.2.2, small-scale mechanization should be used.

Appendix A (mandatory). Rules for selecting products for control during production organization and independent control tests

Appendix A
(required)

A.1 When organizing the production of products and during independent control tests, the physical, mechanical and thermophysical characteristics of the products are assessed in accordance with this standard and declared by the manufacturer.

A.2 Representatives of all interested parties can participate in the selection of controlled products and conducting control tests.

A.3 At least 12 products are selected for testing.

The number of samples for testing is taken according to Table A.1. Sampling is carried out no earlier than 12 hours after the end of autoclave processing and unloading of products from the autoclave.


Table A.1

A.4 The following methods for selecting products are used: random sampling, representative sampling, sampling of products from a stack.

A.5 Random sampling is carried out in a manner in which all items have an equal probability of being selected for the sample. The required number of products is selected randomly, without paying attention to the appearance of the selected products, with the exception of products damaged during transportation, which are not allowed to be selected.

Note - Selection of products in the above manner is possible if the products making up the sample are transported unpackaged or if they are divided into a large number of small piles before they are used.

A.6 If it is impossible to randomly select products, if there is access to a limited number of products, the representative selection method is used. The stack is divided into at least six parts of equal size. From each part, an equal number of products are selected by random selection, but no more than four, so that a sample of the required size is obtained, without paying attention to the appearance of the products, with the exception of products damaged during transportation, which are not allowed to be selected.

Note - When selecting products, some parts of the stack should be moved aside to provide access to the products located inside the stack.

A.7 When selecting products from a stack consisting of packaged products, select at least six packages, from each of which an equal number of randomly selected products are selected, but not more than four, so that a sample of the required size is obtained, without paying attention to the appearance of the products , with the exception of products damaged during transportation, which are not allowed to be taken away.

A.8 If the selected items are used in more than one test, the sample is divided into parts depending on the number of items used in a particular test.



Electronic document text
prepared by Kodeks JSC and verified against:
official publication
M.: Standartinform, 2008