GOST 13579 78 concrete blocks for basement walls. Foundation blocks fbs and gost standards

GOST 13579-78

UDC 691.327-412: 006.354

Group W33

INTERSTATE STANDARD

CONCRETE BLOCKS FOR BASEMENT WALLS

Technical conditions

Concrete blocks for walls of basements.

date introduction 1979-01-01

INFORMATION DATA

1. DEVELOPED

Central Research and Design Institute for Typical and Experimental Design of Housing (TsNIIEP Housing) Gosgrazhdanstroy

All-Union Research Institute of Factory Technology of Precast Concrete Structures and Products (VNIIzhelezobeton) of the Ministry of Industry building materials the USSR

SUBMITTED by the State Committee for Civil Engineering and Architecture under the USSR Gosstroy

2. APPROVED AND INTRODUCED INTO EFFECT by the Decree of the State Committee of the Council of Ministers of the USSR for Construction Affairs dated 30.12.77 No. 234

3. REPLACE GOST 13579-68

4. REFERENCE REGULATORY AND TECHNICAL DOCUMENTS

	Item number		Item number
GOST 5781-82		GOST 13015.0-83		GOST 13015.1-81		GOST 13015.2-81
GOST 10060.3-95		GOST 13015.3-81			GOST 18105-86
GOST 12730.0-78
GOST 12730.2-78
GOST 12730.3-78		SNiP 2.03.01-84
GOST 12730.5-84		SNiP 2.03.11-85

5. EDITION (November 2001) with Amendment No. 1, approved in November 1985 (IUS 3-86)

This standard applies to blocks made of heavy concrete, as well as expanded clay concrete and dense silicate concrete of average density (dried to constant weight) not less than 1800 kg / m 3 and intended for basement walls and technical undergrounds of buildings.

Solid blocks may be used for foundations.

1. TYPES AND CONSTRUCTION OF BLOCKS

1.1. Blocks are classified into three types:

FBS - solid;

FBV - solid with a cutout for laying jumpers and passing communications under the ceilings of basements and technical undergrounds;

FBP - void (with open down voids).

1.2. The shape and size of the blocks must correspond to those indicated in the drawing. 1-3 and in table. one.

FBS type blocks

Blocks 300 mm wide

Blocks 400, 500 and 600 mm wide

Blocks of type FBV

Blocks of FBP type

Table 1

1.3. The structure of the symbol (marks) of the blocks is as follows:

Block type (p. 1.1)

Block dimensions in decimeters:

length (rounded)

height (rounded)

Concrete type: heavy - T; on porous aggregates (expanded clay concrete) - P; dense silicate - С

Symbol of this standard

An example of a conventional designation for a block of the FBS type, 2380 mm long, 400 mm wide and 580 mm high, made of heavy concrete:

FBS24.4.6 -T GOST 13579-78

The same, type FBV, 880 mm long, 400 mm wide and 580 mm high, made of concrete on porous aggregates (expanded clay concrete):

FBV9.4.6 -P GOST 13579-78

The same, type FBP, 2380 mm long, 500 mm wide and 580 mm high, made of dense silicate concrete:

FBP24.5.6 -S GOST 13579-78

Note. It is allowed to manufacture and use blocks with a length of 780 mm (additional), adopted in approved before 01.01. typical projects buildings for the duration of these projects.

1.4. The grades and characteristics of heavy concrete blocks are given in table. 2, from expanded clay concrete - in table. 3, from dense silicate concrete - in table. 4.

With appropriate justification, it is allowed to use concrete blocks with compressive strength classes that differ from those indicated in table. 2-4. In this case, in all cases, no more than B15 and no less than:

В3.5 - for blocks made of heavy concrete and expanded clay concrete;

В12.5 - "" "" dense silicate concrete.

Note. V symbol blocks of concrete with compressive strength classes different from those indicated in table. 2-4, the corresponding numeric index must be entered before the letter characterizing the type of concrete.

table 2

Block brand	Compressive strength class of concrete	Mounting loop		Consumption of materials		Block weight (reference), t
Block brand	Compressive strength class of concrete		Quantity	Concrete, m 3	Steel, kg	Block weight (reference), t

Note. The mass of the blocks is given for heavy concrete with an average density of 2400 kg / m 3.

Table 3

Block brand	Compressive strength class of concrete	Mounting hinges		Consumption of materials		Block weight (reference), t
Block brand	Compressive strength class of concrete		Quantity	Concrete, m 3	Steel, kg	Block weight (reference), t

Note. The mass of the blocks, as well as the brand of mounting loops, are given for blocks of expanded clay concrete with an average density of 1800 kg / m 3.

Table 4

Block brand	Compressive strength class of concrete	Mounting loop		Consumption of materials		Block weight (reference), t
Block brand	Compressive strength class of concrete		Quantity	Concrete, m 3	Steel, kg	Block weight (reference), t

Note. The mass of blocks, as well as mounting loops, is given for blocks of dense silicate concrete with an average density of 2000 kg / m 3.

1.5. The location of the mounting loops in the blocks must correspond to that indicated in fig. 1-3. Mounting hinge designs are given in the appendix.

It is allowed to install mounting loops in FBS-type blocks with a length of 1180 and 2380 mm at a distance of 300 mm from the ends of the block and flush with its upper plane.

When using special gripping devices for lifting and mounting blocks, it is allowed, by agreement between the manufacturer, the consumer and the design organization, to manufacture blocks without mounting loops.

1.4, 1.5. (Modified edition, Amendment No. 1).

2. TECHNICAL REQUIREMENTS

2.1. The materials used for the preparation of concrete must ensure that technical requirements specified in this standard and comply with applicable standards or specifications for these materials.

2.2. Actual strength concrete blocks (at design age and release) must comply with the required one assigned in accordance with GOST 18105, depending on the normalized concrete strength specified in project documentation on a building or structure, and on the indicator of the actual uniformity of the strength of concrete.

(Modified edition, Amendment No. 1).

2.3. Frost resistance and water resistance of concrete should be assigned in the project depending on the operating mode of structures and climatic conditions of the construction area in accordance with SNiP 2.03.01 - for heavy concrete and expanded clay concrete and SN 165 - for dense silicate concrete.

2.4. Concrete, as well as materials for preparing concrete for blocks intended for use in an aggressive environment, must meet the requirements of SNiP 2.03.11, as well as the additional requirements of SN 165 for blocks made of dense silicate concrete.

2.5. Classes of concrete in terms of compressive strength, grades of concrete for frost resistance and water resistance, and, if necessary, the requirements for concrete and materials for its preparation (see clause 2.4), must correspond to the design ones specified in orders for the manufacture of blocks.

2.6. Delivery of blocks to the consumer must be made after the concrete has reached the required tempering strength (clause 2.2).

2.7. The value of the normalized tempering strength of concrete blocks as a percentage of the compressive strength class should be taken equal to:

50 - for heavy concrete and expanded clay concrete of class B12.5 and above;

70 - "" "class B10 and below;

80 - "expanded clay concrete" B10 and below;

100 - "dense silicate concrete.

When blocks are delivered to cold period year, it is allowed to increase the value of the normalized tempering strength of concrete as a percentage of the compressive strength class, but not more;

70 - for concrete of class B12.5 and above;

90 - "" "B10 and below.

The value of the normalized tempering strength of concrete should be taken according to the design documentation for a specific building or structure in accordance with the requirements of GOST 13015.0.

Delivery of blocks with a concrete tempering strength lower than the strength corresponding to its compressive strength class is carried out under the condition that the manufacturer guarantees that the concrete will achieve the required strength at the design age, determined by the results of testing control samples made from concrete mix working staff and stored in conditions according to GOST 18105.

2.5-2.7. (Modified edition, Amendment No. 1).

2.8. When blocks are released to the consumer, the moisture content of expanded clay concrete should not be more than 12%.

2.9. Mounting loops of blocks should be made of hot-rolled rod reinforcement smooth class A-I stamps VSt3ps2 and VSt3sp2 or periodic profile Аc-II, grade 10GT in accordance with GOST 5781.

Reinforcement made of steel grade VSt3ps2 is not allowed to be used for mounting loops intended for lifting and mounting blocks at temperatures below minus 40 ° C.

2.10. Deviations in mm of the design dimensions of the blocks should not exceed:

2.11. The deviation from the straightness of the profile of the block surfaces should not exceed 3 mm over the entire length and width of the block.

2.12. Set the following categories concrete surface blocks:

A3 - front, intended for painting;

A5 - front, intended for finishing ceramic tiles stacked on a layer of mortar;

A6 - front, unfinished;

A7 - non-face, invisible under operating conditions.

Requirements for the quality of block surfaces are in accordance with GOST 13015.0.

(Modified edition, Amendment No. 1).

2.13. (Deleted, Amendment No. 1).

2.14. In concrete, blocks taken in accordance with Sec. 3, cracks are not allowed, with the exception of local surface shrinkage, the width of which should not exceed 0.1 mm in blocks of heavy and dense silicate concrete and 0.2 mm in blocks of expanded clay concrete.

2.15. Mounting loops must be free of concrete build-up.

3. RULES OF ACCEPTANCE

3.1. Acceptance of blocks should be carried out in batches in accordance with the requirements of GOST 13015.1 and this standard.

3.2. Acceptance of blocks for frost resistance and water tightness of concrete, release moisture of expanded clay concrete, as well as for water absorption of concrete of blocks intended for operation in an environment with an aggressive degree of impact, should be carried out according to the results of periodic tests.

3.3. Tests of concrete for water resistance and water absorption of blocks to which these requirements are imposed should be carried out at least once every three months.

3.4. The release moisture content of expanded clay concrete should be monitored at least once a month based on the results of testing samples taken from three ready-made blocks.

The assessment of the actual release moisture content should be carried out according to the results of checking each controlled block according to the average moisture content of the samples taken from it.

3.5. Acceptance of blocks in terms of concrete strength (class of concrete in terms of compressive strength and tempering strength), compliance of assembly loops with the requirements of this standard, accuracy of geometric parameters, width of technological crack opening and category of concrete surface of blocks should be carried out according to the results of acceptance tests.

3.6. Acceptance of blocks in terms of accuracy of geometric parameters, category of concrete surface and width of opening of technological cracks should be carried out according to the results of a one-stage sampling inspection.

3.7. Acceptance of blocks according to the presence of mounting loops, the correctness of the application of marking inscriptions and signs should be carried out by means of continuous control with rejection of blocks that have defects according to the specified indicators.

Sec. 3. (Modified edition, Amendment No. 1).

4. METHODS OF CONTROL AND TESTING

4.1. The compressive strength of concrete should be determined in accordance with GOST 10180 on a series of samples made from a concrete mixture of the working composition and stored under the conditions established by GOST 18105.

When testing blocks non-destructive methods the actual tempering compressive strength of concrete should be determined by the ultrasonic method in accordance with GOST 17624 or by mechanical devices in accordance with GOST 22690, as well as other methods provided for in the standards for concrete testing methods.

(Modified edition, Amendment No. 1).

4.2. (Deleted, Amendment No. 1).

4.3. The concrete grade for frost resistance should be controlled in accordance with GOST 10060.0 - GOST 10060.4.

4.4. The water resistance of concrete blocks should be determined in accordance with GOST 12730.0 and GOST 12730.5 on a series of samples made from a concrete mixture of the working composition.

(Modified edition, Amendment No. 1).

4.4.1. (Deleted, Amendment No. 1).

4.5. The water absorption of concrete blocks intended for use in an aggressive environment should be determined in accordance with the requirements of GOST 12730.0 and GOST 12730.3 on a series of samples made from a concrete mixture of a working composition.

4.6.(Deleted, Amendment No. 1).

4.7. The moisture content of expanded clay concrete should be determined in accordance with GOST 12730.0 and GOST 12730.2 by testing samples taken from finished blocks.

At least two samples should be taken from each block.

It is allowed to determine the moisture content of concrete blocks by the dielectric method in accordance with GOST 21718.

(Modified edition, Amendment No. 1).

4.8. Dimensions and deviation from the straightness of the blocks, the position of the mounting hinges, as well as the quality of the surfaces and appearance blocks are checked in accordance with GOST 13015.0.

5. MARKING, STORAGE AND TRANSPORTATION

5.1. Block marking - in accordance with GOST 13015.2.

Markings and signs should be applied on the side surface of the block.

(Modified edition, Amendment No. 1).

5.2. Blocks should be stored in stacks sorted by grade and lot and stacked close to each other.

The height of a stack of blocks should be no more than 2.5 m.

5.3. During storage and transportation, each block must be stacked on wooden spacers, located vertically one above the other between the rows of blocks.

The pads for the bottom row of blocks should be laid on a dense, carefully leveled base.

5.4. The thickness of the spacers must be at least 30 mm.

5.5. The blocks must be transported with a secure fastening that protects them from displacement.

The height of the stack during transportation is set depending on the carrying capacity of vehicles and the permissible size of loading.

5.6. Loading, transportation, unloading and storage of blocks must be carried out in compliance with measures to exclude the possibility of damage.

5.7. Requirements for the document on the quality of blocks supplied to the consumer are in accordance with GOST 13015.3.

In addition, the document on the quality of the blocks should contain the grades of concrete for frost resistance and water resistance, as well as the water absorption of concrete (if these indicators are specified in the order for the manufacture of blocks).

(Modified edition, Amendment No. 1).

6. MANUFACTURER'S WARRANTIES

6.1. The manufacturer must ensure that the supplied units comply with the requirements of this standard, provided that the consumer observes the rules for transportation, conditions of use and storage of units established by the standard.

APPENDIX

Mandatory

MOUNTING HINGES

Specification and selection of steel for one mounting loop

With appropriate justification, it is allowed to use blocks made of concrete of compressive strength classes that differ from those specified in -. Moreover, in all cases, the compressive strength class of concrete should be taken no more than B15 and no less:

B3.5 - for blocks made of heavy and lightweight concrete;

B12.5 - for blocks made of dense silicate concrete.

Note. In the conventional designation of blocks made of concrete of classes of compressive strength that differ from those indicated in -, the corresponding digital index should be entered in front of the letter characterizing the type of concrete.

1.5. The location of the mounting loops in the blocks must correspond to that indicated on -. Mounting hinge designs are given in.

It is allowed to install mounting loops in FBS-type blocks with a length of 1180 and 2380 mm at a distance of 300 mm from the ends of the block and flush with its upper plane.

1.3 - 1.5.

Block brand	Compressive strength class of concrete	Mounting loop		Consumption of materials		Block weight (reference), t
Block brand	Compressive strength class of concrete	Brand	Quantity	Concrete, m 3	Steel, kg	Block weight (reference), t

Note. The mass of the blocks is given for heavy concrete with an average density of 2400 kg / m 3.

2.7. The value of the normalized tempering strength of concrete blocks (as a percentage of the compressive strength class) should be taken equal to:

50 - for heavy concrete and lightweight concrete of class B12.5 and higher;

70 - for heavy concrete of class B10 and below;

80 - for lightweight concrete of class B10 and below;

100 - for dense silicate concrete.

When supplying blocks during the cold season, it is allowed to increase the normalized tempering strength of concrete, but not more than values (as a percentage of the compressive strength class):

70 - for concrete of class B12.5 and above;

90 - for concrete of class B10 and below.

Delivery of blocks with a concrete tempering strength lower than the strength corresponding to its compressive strength class is carried out under the condition that the manufacturer guarantees that the concrete will achieve the required strength at the design age, determined by the results of testing control samples made from a concrete mixture of a working composition and stored under conditions according to GOST 18105.

2.5 - 2.7. (Modified edition, Amendment No. 1).

2.8. When blocks are delivered to the consumer, the moisture content of lightweight concrete should not be more than 12%.

(Modified edition, Amendment No. 1).

2.9. Mounting loops of blocks should be made of hot-rolled rod reinforcement smooth class A-I grades VSt3ps2 and VSt3sp2 or periodic profile Аc-II, grade 10GT in accordance with GOST 5781.

Reinforcement made of steel grade VSt3ps2 is not allowed to be used for mounting loops intended for lifting and mounting blocks at temperatures below minus 40 ° C.

2.10. Deviation of the design dimensions of the blocks should not exceed, mm:

along length 13

in width and height 8

by cut-out dimensions 5

2.11. The deviation from the straightness of the profile of the block surfaces should not exceed 3 mm over the entire length and width of the block.

(Revised edition).

2.12. The following categories of concrete block surfaces are established:

A3 - front, intended for painting;

A5 - front, intended for finishing with ceramic tiles, laid on a layer of mortar;

A6 - front, unfinished;

A7 - non-face, not visible under operating conditions.

Requirements for the quality of block surfaces are in accordance with GOST 13015.0.

(Modified edition, Amendment No. 1).

2.13. (Deleted, Amendment No. 1).

2.14. In concrete, blocks taken in accordance with Sec. 3, cracks are not allowed, except for local surface shrinkage, the width of which should not exceed 0.1 mm in blocks of heavy and dense silicate concrete and 0.2 mm in blocks of lightweight concrete.

(Modified edition, Amendment No. 1).

2.15. Mounting loops must be free of concrete build-up.

3. ACCEPTANCE

3.1. Acceptance of blocks should be carried out in batches in accordance with the requirements of GOST 13015.1 and this standard.

3.2. Acceptance of blocks for frost resistance and water tightness of concrete, tempering moisture content of lightweight concrete, as well as for water absorption of concrete of blocks intended for operation in an environment with an aggressive degree of impact, should be carried out according to the results of periodic tests.

3.3. Tests of concrete for water resistance and water absorption of blocks to which these requirements are imposed should be carried out at least once every 3 months.

3.4. The release moisture content of lightweight concrete should be monitored at least once a month based on the results of testing samples taken from three ready-made blocks.

3.5. Acceptance of blocks in terms of concrete strength (class of concrete in terms of compressive strength and tempering strength), compliance of mounting loops with the requirements of this standard, accuracy of geometric parameters, width of technological crack opening and category of concrete surface of blocks should be carried out according to the results of acceptance tests.

3.7. Acceptance of blocks according to the presence of mounting loops, the correct application of markings and signs should be carried out by means of continuous control with rejection of blocks that have defects according to the specified indicators.

Sec. 3. (Modified edition, Amendment No. 1).

4. METHODS OF CONTROL AND TESTING

When testing blocks by non-destructive methods, the actual tempering compressive strength of concrete should be determined by the ultrasonic method in accordance with GOST 17624 or by mechanical devices in accordance with GOST 22690, as well as other methods provided for in the standards for concrete testing methods.

(Modified edition, Amendment No. 1).

4.2. (Deleted, Amendment No. 1).

4.3. The frost resistance grade of concrete should be determined in accordance with GOST 10060.

4.4. The water resistance of concrete blocks should be determined in accordance with GOST 12730.0 and GOST 12730.5 on a series of samples made from a concrete mixture of the working composition.

(Modified edition, Amendment No. 1).

4.4.1. (Deleted, Amendment No. 1).

(Modified edition, Amendment No. 1).

4.6. (Deleted, Amendment No. 1).

4.7. The moisture content of lightweight concrete should be determined in accordance with GOST 12730.0 and GOST 12730.2 by testing samples taken from finished blocks.

At least two samples should be taken from each block.

It is allowed to determine the moisture content of concrete blocks by the dielectric method in accordance with GOST 21718.

(Modified edition, Amendment No. 1).

GOST 13579-78

Group W33

INTERSTATE STANDARD

CONCRETE BLOCKS FOR BASEMENT WALLS

Technical conditions

Concrete blocks for walls of basements. Specifications

MKC 91.080.40 OKP 58 3500

Date of introduction 1979-01-01

INFORMATION DATA

1. DEVELOPED by the Central Research and Design Institute

typical and experimental design of a dwelling (TsNIIEP dwelling) Gosgrazhdanstroy

All-Union Research Institute of Factory Technology of Precast Concrete Structures and Products (VNIIzhelezobeton) of the Ministry of Construction Materials Industry of the USSR

SUBMITTED by the State Committee for Civil Engineering and Architecture under the USSR Gosstroy

2. APPROVED AND INTRODUCED INTO EFFECT by the Decree of the State Committee of the Council of Ministers of the USSR for Construction Affairs dated 12.30.77 N 234

3. REPLACE GOST 13579-68

4. REFERENCE REGULATORY AND TECHNICAL DOCUMENTS

			Item number


	GOST 5781-82
	GOST 10060.0-95


	GOST 10060.1-95


	GOST 10060.2-95


	GOST 10060.3-95


	GOST 10060.4-95


	GOST 10180-90


	GOST 12730.0-78


	GOST 12730.2-78


	GOST 12730.3-78


	GOST 12730.5-84


	GOST 13015-2003

			2.7, 2.12, 3.1, 4.8, 5.1, 5.7
	GOST 17624-87


	GOST 18105-86


	GOST 21718-84

	GOST 22690-88
	SNiP 2.03.01-84


	SNiP 2.03.11-85

5. EDITION (October 2005) with Amendment No. 1, approved in November 1985

(IUS 3-86)

This standard applies to blocks made of heavy concrete, as well as expanded clay concrete and dense silicate concrete of medium density (dried to constant weight) not less than

1800 kg / m and intended for basement walls and technical undergrounds of buildings.

Solid blocks may be used for foundations. (Modified edition, Amendment N 1).

1. TYPES AND CONSTRUCTION OF BLOCKS

1.1. Blocks are subdivided into three types: FBS - solid;

FBV - solid with a cutout for laying jumpers and passing communications under the ceilings of basements and technical undergrounds;

FBP - void (with open down voids).

1.2. The shape and size of the blocks must correspond to those indicated in Fig. 1-3 and in Table 1.

Damn 1. FBS type blocks

FBS type blocks

Blocks 300 mm wide

Blocks 400, 500 and 600 mm wide

Damn 1 (continued)

Damn 2. Blocks of type FBV

Blocks of type FBV

Damn. 3. Blocks of FBP type

Blocks of FBP type

Table 1

Block type	The main dimensions of the block, mm





		300; 400; 500; 600





		300; 400; 500; 600

1.3 The structure of the symbol (marks) of the blocks is as follows:

Block type (clause 1.1)

Unit dimensions in decimetres: length (rounded)

height (rounded)

Concrete type: heavy - T; on porous aggregates (expanded clay concrete) - P; dense silicate - С

Symbol of this standard

An example of a conventional designation for a block of the FBS type with a length of 2380 mm, a width of 400 mm and a height of 580 mm, made of heavy concrete:

FBS24.4.6-T GOST 13579-78

The same, type ФБВ 880 mm long, 400 mm wide and 580 mm high, made of concrete on porous aggregates (expanded clay concrete):

FBV9.4.6-P GOST 13579-78

The same, type FBP with a length of 2380 mm, a width of 500 mm and a height of 580 mm, made of dense silicate concrete:

FBP24.5.6-S GOST 13579-78

Note. It is allowed to manufacture and use blocks with a length of 780 mm (additional), adopted in the standard projects of buildings approved before 01/01/1978, for the duration of these projects.

1.4. The grades and characteristics of blocks from heavy concrete are given in Table 2, from expanded clay concrete - in Table 3, from dense silicate concrete - in Table 4.

With appropriate justification, it is allowed to use concrete blocks with compressive strength classes that differ from those indicated in Tables 2-4. Moreover, in all cases, the compressive strength class of concrete should be taken no more than B15 and no less:

В3.5 - for blocks made of heavy concrete and expanded clay concrete; В12.5 "" "dense silicate concrete.

Note. In the symbolic designation of concrete blocks of compressive strength classes that differ from those indicated in Tables 2-4, the corresponding digital index must be entered in front of the letter characterizing the type of concrete.

table 2

Mounting

Block weight

concrete on

materials

(reference),

strength

for compression

STATE STANDARD OF THE UNION OF SSR

CONCRETE BLOCKS FOR BASEMENT WALLS

Technical conditions

GOST 13579-78

STATE CONSTRUCTION COMMITTEE of the USSR

Moscow

STATE STANDARD OF THE UNION OF SSR

Date of introduction 01.01.79

This standard applies to blocks made of heavy concrete, as well as light and dense silicate concrete with an average density of at least 1800 kg / m 3 and intended for basement walls and technical undergrounds of buildings. Solid blocks may be used for foundations.

(Modified edition, Amendment No. 1).

1. TYPES AND CONSTRUCTION OF BLOCKS

1.1. Blocks are classified into three types:

FBS - solid;

FBV - solid with a cutout for laying jumpers and passing communications under the ceilings of basements and technical undergrounds;

FBP - void (with open down voids).

1.2. The shape and size of the blocks must correspond to those indicated on - and in table. one.

Table 1

Block type	The main dimensions of the block, mm
	Lengthl	Widthb	Height h

FBS type blocks

A. Blocks 300 mm wide

B3.5 - for blocks made of heavy and lightweight concrete;

B12.5 - for blocks made of dense silicate concrete.

1.5. The location of the mounting loops in the blocks must correspond to that indicated on -. Mounting hinge designs are given in.

It is allowed to install mounting loops in FBS-type blocks with a length of 1180 and 2380 mm at a distance of 300 mm from the ends of the block and flush with its upper plane.

1.3 - 1.5.

Block brand	Compressive strength class of concrete	Mounting loop		Consumption of materials		Block weight (reference), t
Block brand	Compressive strength class of concrete	Brand	Quantity	Concrete, m 3	Steel, kg	Block weight (reference), t

Note. The mass of the blocks is given for heavy concrete with an average density of 2400 kg / m 3.

2.7. The value of the normalized tempering strength of concrete blocks (as a percentage of the compressive strength class) should be taken equal to:

50 - for heavy concrete and lightweight concrete of class B12.5 and higher;

70 - for heavy concrete of class B10 and below;

80 - for lightweight concrete of class B10 and below;

100 - for dense silicate concrete.

When supplying blocks during the cold season, it is allowed to increase the normalized tempering strength of concrete, but not more than values (as a percentage of the compressive strength class):

70 - for concrete of class B12.5 and above;

90 - for concrete of class B10 and below.

Delivery of blocks with a concrete tempering strength lower than the strength corresponding to its compressive strength class is carried out under the condition that the manufacturer guarantees that the concrete will achieve the required strength at the design age, determined by the results of testing control samples made from a concrete mixture of a working composition and stored under conditions according to GOST 18105.

2.5 - 2.7. (Modified edition, Amendment No. 1).

2.8. When blocks are delivered to the consumer, the moisture content of lightweight concrete should not be more than 12%.

(Modified edition, Amendment No. 1).

2.9. Mounting loops of blocks should be made of rod hot-rolled reinforcement smooth class A-I grades VSt3ps2 and VSt3sp2 or periodic profile Аc-II, grade 10GT according to GOST 5781.

Reinforcement made of steel grade VSt3ps2 is not allowed to be used for mounting loops intended for lifting and mounting blocks at temperatures below minus 40 ° C.

2.10. Deviation of the design dimensions of the blocks should not exceed, mm:

along length 13

in width and height 8

by cut-out dimensions 5

2.11. The deviation from the straightness of the profile of the block surfaces should not exceed 3 mm over the entire length and width of the block.

(Revised edition).

2.12. The following categories of concrete block surfaces are established:

A3 - front, intended for painting;

A5 - front, intended for finishing with ceramic tiles, laid on a layer of mortar;

A6 - front, unfinished;

A7 - non-face, not visible under operating conditions.

Requirements for the quality of block surfaces are in accordance with GOST 13015.0.

(Modified edition, Amendment No. 1).

2.13. (Deleted, Amendment No. 1).

(Modified edition, Amendment No. 1).

2.15. Mounting loops must be free of concrete build-up.

3. ACCEPTANCE

3.1. Acceptance of blocks should be carried out in batches in accordance with the requirements of GOST 13015.1 and this standard.

3.3. Tests of concrete for water resistance and water absorption of blocks to which these requirements are imposed should be carried out at least once every 3 months.

3.4. The release moisture content of lightweight concrete should be monitored at least once a month based on the results of testing samples taken from three ready-made blocks.

Sec. 3. (Modified edition, Amendment No. 1).

4. METHODS OF CONTROL AND TESTING

(Modified edition, Amendment No. 1).

4.2. (Deleted, Amendment No. 1).

4.3. The frost resistance grade of concrete should be determined in accordance with GOST 10060.

4.4. The water resistance of concrete blocks should be determined in accordance with GOST 12730.0 and GOST 12730.5 on a series of samples made from a concrete mixture of the working composition.

(Modified edition, Amendment No. 1).

4.4.1. (Deleted, Amendment No. 1).

(Modified edition, Amendment No. 1).

4.6. (Deleted, Amendment No. 1).

4.7. The moisture content of lightweight concrete should be determined in accordance with GOST 12730.0 and GOST 12730.2 by testing samples taken from finished blocks.

At least two samples should be taken from each block.

It is allowed to determine the moisture content of concrete blocks by the dielectric method in accordance with GOST 21718.

(Modified edition, Amendment No. 1).