GOST 21520 89 cellular concrete blocks. Reference regulatory and technical documents

INTERSTATE STANDARD

TECHNICAL CONDITIONS

Official edition

IPK PUBLISHING STANDARDS Moscow

INTERSTATE STANDARD

BLOCKS FROM CELLULAR CONCRETE WALL SMALL

Specifications

Small-sized wall blocks of cellular concrete. Specifications

MKS 91.080.40 OKP 58 3000

Date of introduction 01.01.90

This standard applies to wall small blocks made of cellular concrete(hereinafter referred to as blocks) intended for laying outdoor, internal walls and building partitions relative humidity indoor air is not more than 75% and in a non-aggressive environment.

In rooms with air humidity over 60% inner surface blocks of external walls must have a vapor barrier coating.

1. TECHNICAL REQUIREMENTS

1.1. Main parameters and dimensions

1.1.1. Blocks should be manufactured in accordance with the requirements of this standard for technological documentation approved in the prescribed manner.

1.1.2. The types and sizes of blocks must correspond to those indicated in Table. one.

Table 1

block type	Block size, mm, for masonry
	on solution

Notes:

1. It is allowed to manufacture blocks of other sizes at the request of the consumer, agreed with the design organization.

2. Ratio of block types with medium density concrete is given in the appendix.

3. The thickness of the blocks for masonry with glue can be, if necessary, equal to the thickness of the blocks used for masonry with mortar.

Official publication Reprint prohibited

1.1.3. Symbol blocks when ordering, should consist of a designation of the type of block, class (grade) of concrete in terms of compressive strength, grade in average density, grade in frost resistance and category.

An example of a symbol for a type I block, compressive strength class B2.5, average density grade D500, frost resistance grade F35, category 2:

The same, type V block, compressive strength class B5, average density grade D900, frost resistance grade F75, category 1:

1.2. Characteristics

1.2.1. Requirements for materials and concrete

1.2.1.1. Materials and concrete for the manufacture of blocks must comply with the requirements of GOST 25485.

1.2.1.2. Classes (grades) of concrete in terms of compressive strength and grades of concrete in average density should not be lower than class (grade) in strength B 1.5 (M25) and grades in average density not more than D1200.

1.2.1.3. The actual strength of concrete must correspond to the required one, assigned in accordance with GOST 18105, depending on the normalized strength of concrete specified in the order, and on the indicators of the actual uniformity of concrete strength.

1.2.1.4. The actual average density of concrete must correspond to the required one, assigned in accordance with GOST 27005, depending on the normalized average density specified in the order, and on the indicators of the actual uniformity of concrete density.

1.2.1.5 The values of drying shrinkage, as well as the thermal conductivity of concrete blocks, must not exceed the values specified in GOST 25485.

1.2.1.6. Release humidity of concrete blocks should not exceed, % by weight:

25 - based on sand;

35 » » ash and other production waste.

1.2.1.7. Concrete grades for frost resistance should be, depending on the mode of their operation and calculated winter temperatures outdoor air in construction areas not less than:

F25 - for blocks of external walls;

F15 » » internal »

1.2.1.8. The ratio of concrete grades for average density with concrete classes for compressive strength is given in table. 2.

table 2

* The compressive strength ratings refer to non-autoclaved concrete blocks only.

1.2.2. Values of deviations of geometric parameters and indicators appearance should not exceed the limit specified in table. 3.

Table 3

Deviations from linear dimensions

Damage to corners and ribs

Notes:

1. Damage to the corners and ribs is not considered to be defects having a depth: for the 1st category - up to 3 mm; 2nd - up to 5 mm and 3rd - up to 10 mm.

2. The release of blocks of the 3rd category is allowed until 01.01.96.

1.3. Marking

1.3.1. Batches of blocks that differ in grades of concrete in terms of average density and strength classes should be marked with indelible paint.

1.3.2. Marking should be applied to at least two blocks on opposite sides of the container or a package of numbers indicating the average density of concrete blocks and their compressive strength class. For blocks with a concrete grade in average density from D500 to D900, one first digit of the number should be applied, from D 1000 to D1200 - the first two digits of the number. For example, if the blocks in the batch have a concrete grade of average density D600 and a compressive strength class of B2.5, then the numbers are applied to the blocks

With a concrete grade for average density D1000 and a compressive strength class of B7.5, numbers are applied

1.3.3. Each packed place must be marked with the “Keep away from moisture” sign in accordance with GOST 14192.

2. ACCEPTANCE

2.1. Acceptance of blocks - in accordance with GOST 13015.1 and this standard in batches.

2.2. The number of blocks with deviations from linear dimensions exceeding those indicated in Table. 3 shall not exceed 5% of the lot in total.

2.3. The number of blocks with damage to the corners and ribs exceeding those indicated in Table. 3 shall not exceed 5% of the lot in total.

2.4. The number of blocks with cracks crossing more than two faces, as well as blocks with cracks along four faces, should not exceed 5% of the batch in total.

2.5. Blocks are accepted according to the data of acceptance and periodic control.

Blocks are accepted according to the results of acceptance tests in terms of compressive strength, average density, release moisture and geometric parameters.

Control of blocks in terms of frost resistance, thermal conductivity and shrinkage during drying is carried out before the start of mass production, when the technology or quality of materials changes, but at least once a year - in terms of thermal conductivity and shrinkage during drying and once every 6 months - in terms of frost resistance .

2.6. The consumer has the right to control check compliance of the units specified in the order with the requirements of this standard, using the control procedure specified in pi. 2.7 and 2.8.

2.7. To check the blocks for compliance with the requirements and. 1.2.2 at least 30 blocks are selected from the batch from the outer and inner rows of containers or stacks.

At vertical pattern cutting control check of blocks is carried out:

In terms of average density, compressive strength and release moisture - at least two blocks from different arrays;

In terms of frost resistance - at least six blocks from the middle part of one array;

With a horizontal cutting scheme, the control check of the blocks is carried out:

In terms of average density, compressive strength and release moisture - at least two blocks from each layer from different arrays;

In terms of frost resistance - at least three blocks from the middle row, and in case of two-row cutting - the upper row of one array;

By shrinkage during drying - one block at a time.

2.8. If the control results are unsatisfactory for at least one of the indicators, a second check is carried out for this indicator of the double number of samples of the controlled lot.

In case of unsatisfactory results of the re-check in terms of geometric parameters, the acceptance of blocks is carried out individually.

Upon receipt of reduced results of re-testing in terms of strength and frost resistance, a batch of blocks is accepted according to the obtained indicators during control.

Upon receipt of underestimated or overestimated by one grade values for the average density of concrete, a batch of blocks is accepted according to the obtained indicators during control.

The possibility of using accepted blocks that do not correspond to those specified in terms of strength, average density, release moisture and frost resistance is established by the design organization.

2.9. Blocks in the package must be non-sticky and freely disassembled by hand.

2.10. Concrete strength control is carried out according to GOST 18105, and medium density - according to GOST 27005.

2.11. Each batch of blocks is accompanied by a quality document, which indicates:

Name and address of the manufacturer;

Conditional designation of blocks;

The designation of this standard;

Number and date of issue of the quality document;

Batch number, volume and/or number of blocks shipped.

3. CONTROL METHODS

3.1. The dimensions, the difference in the lengths of the diagonals, the curvature of the faces and edges are checked in accordance with GOST 13015.0 and GOST 26433.0.

3.2. All measuring instruments used must be at least 2nd class of accuracy.

It is allowed to use special non-standardized measuring instruments that have passed

metrological certification in accordance with the requirements of GOST 8.326*.

3.3. The control of the damage depth of the ribs and corners is carried out by measuring the perpendicular, lowered from the top of the corner or from the rib to the conditional plane of the defect, in accordance with the scheme for measuring the depth of damage to the corners and edges of the blocks with a depth gauge according to GOST 162.

* In the territory Russian Federation PR 50.2.009-94 apply.

3.4. Specifications DAMAGE DEPTH MEASUREMENT FLOW DIAGRAM

kov control in accordance with the requirements - CORNERS AND RIBS OF BLOCKS

following standards:

Compressive strength - according to GOST 10180;

Average density - according to GOST 12730.1;

Frost resistance - according to GOST 25485;

Shrinkage during drying - according to GOST 25485;

Thermal conductivity of concrete blocks - according to GOST 25485;

Release humidity - according to GOST 12730.2 and GOST 21718.

4. TRANSPORT AND STORAGE

4.1. Blocks are transported in containers in accordance with GOST 20259 or on pallets in accordance with GOST 18343 with rigid fixation with a shrink film or bandaging them steel tape in accordance with GOST 3560 or other fastening that ensures the immobility and safety of the blocks.

4.2. Transportation of blocks is carried out by any type of transport in accordance with the requirements of GOST 9238 and " Specifications loading and securing cargo.

4.4. Blocks should be stored sorted by types, categories, strength classes, grades by average density and stacked in stacks no more than 2.5 m high. Blocks should be protected from moisture.

RATIO OF TYPES OF BLOCKS WITH AVERAGE DENSITY OF CONCRETE

block type	Concrete grade by average density
	D500, D600, D700

Note. The “-” sign means that concrete of this medium density is not recommended.

INFORMATION DATA

1. DEVELOPED by the Research, Design and Technological Institute of Concrete and Reinforced Concrete (NIIZhB) of the State Construction Committee of the USSR, the Central Research and Design and Experimental Institute complex problems building structures and structures named after V.A. Kucherenko (TsNIISK named after V.A. Kucherenko) Gosstroy of the USSR, Research Institute of Building Physics (NIISF) Gosstroy of the USSR

INTRODUCED by the Research, Design and Technological Institute of Concrete and Reinforced Concrete (NIIZhB) of the USSR State Construction Committee

2. APPROVED AND INTRODUCED BY Decree of the State Construction Committee of the USSR dated March 30, 1989 No. 58

3. REPLACE GOST 21520-76

4. REFERENCE REGULATIONS AND TECHNICAL DOCUMENTS

	Item number
GOST 8.326-89

GOST 3560-73
GOST 9238-83
GOST 10180-90
GOST 12730.1-78
GOST 12730.2-78
GOST 13015.0-83
GOST 13015.1-81
GOST 14192-96
GOST 18105-86
GOST 18343-80
GOST 20259-80
GOST 21718-84
GOST 25485-89	1.2.1.1, 1.2.1.5, 3.4
GOST 26433.0-85
GOST 27005-86

5. REPUBLICATION. December 2003

Editor V.P. Ogurtsov Technical editor V.N. Prusakova Proofreader N.L. Rybalko Computer layout E.N. Martemyanova

Ed. persons. No. 02354 dated 07/14/2000. Handed over to the set 01/13/2004. Signed for publication on February 2, 2004. Uel. oven l. 0.93.

Uch.-ed. l. 0.65. Circulation 96 copies. From 675. Law. 127.

IPK Publishing house of standards, 107076 Moscow, Kolodezny per., 14. e-mail:

Typed at the Publishing House on a PC

Printed in the branch of IPK Publishing house of standards - type. "Moscow printer", 105062 Moscow, Lyalin per., 6.


Designation	GOST 21520-89
Title in Russian	Blocks from cellular concrete wall small. Specifications
Title in English	Small-sized wall blocks of cellular concrete. Specifications
Date of entry into force	01.01.1990
OKS	91.080.40
OKP code	583000
KGS code	Zh33
SRSTI rubricator index	671131
Annotation (scope)	This standard applies to wall small blocks made of cellular concrete intended for laying external, internal walls and partitions of buildings with a relative humidity of indoor air of not more than 75% and in a non-aggressive environment.
Keywords	state building; laying of external, internal walls and partitions of buildings;
Type of standard	Standards for products (services)
Designation of the replacement(s)	GOST 21520-76
Substitute designation in part	GOST 31360-2007 in terms of autoclaved cellular concrete products
Normative references to: GOST	GOST 8.326-78; GOST 162-80; GOST 3560-73; GOST 9238-83; GOST 10180-89; GOST 12730.1-78; GOST 12730.2-78; GOST 13015-75; GOST 13015.1-81; GOST 14192-77; GOST 18105-86; GOST 18343-80; GOST 20259-80; GOST 21718-84; GOST 25485-89; GOST 26433.0-85; GOST 27005-86
The document was submitted by the CIS organization	NIIZhB Gosstroy USSR
Department of Rostekhregulirovanie	50 - Ministry of Construction of the Russian Federation
MND Developer	the Russian Federation
Date of last edition	01.12.2003
Number(s) of change(s)	reissue
Number of pages (original)	7
Organization - Developer	NIIZHB Gosstroy of the USSR; TsNIISK them. V.A. Kucherenko Gosstroy of the USSR; NIISF Gosstroy of the USSR; State Construction Committee of the Estonian SSR
Status	Active

GOST 21520-89

Group G33

STATE STANDARD OF THE UNION OF THE SSR

CELLULAR CONCRETE BLOCKS

WALL SMALL

Specifications

Small-sized wall blocks of

cellular cancrete.

Introduction date 1990-01-01

INFORMATION DATA

1. DEVELOPED by the Research, Design and Technological Institute of Concrete and Reinforced Concrete (NIIZhB) of the USSR State Construction Committee

Central Research and Design and Experimental Institute of Complex Problems of Building Structures and Structures named after V.A. Kucherenko (TsNIISK named after Kucherenko) of the State Construction Committee of the USSR

Research Institute of Building Physics (NIISF) Gosstroy of the USSR

State Construction Committee of the ESSR

PERFORMERS

A.M. Krokhin, Candidate of Technical Sciences (topic leader); R.L.Serykh, Doctor of Technical Sciences; I.M. Drobyashchenko, Candidate of Technical Sciences; N.I. Levin, Ph.D. sciences; L.I. Ostrat, Candidate of Technical Sciences; V.G. Gagarin, Candidate of Technical Sciences; A.I. Ananiev, Candidate of Technical Sciences; T.A. Ukhova, Candidate of Technical Sciences; R.M. Koltovskaya; I.N. Nagornyak

2. INTRODUCED by the Research, Design and Technological Institute of Concrete and Reinforced Concrete (NIIZhB) of the USSR State Construction Committee

3. APPROVED AND PUT INTO EFFECT by the Decree of the State building committee USSR dated March 30, 1989 N 58

4. REPLACE GOST 21520-76

5. DATE OF VERIFICATION 1996

6. REFERENCE REGULATIONS AND TECHNICAL DOCUMENTS

Designation of NTD,

for which

item number,

subparagraph

Designation of NTD,

for which

item number,

subparagraph

GOST 8.326-78

GOST 3560-73

GOST 7076-87

GOST 9238-83

GOST 10180-89

GOST 12730.1-78

GOST 12730.2-78

GOST 13015-75

GOST 13015.1-81

GOST 14192-77

GOST 18105-86

GOST 18343-80

GOST 20259-80

GOST 21718-84

GOST 25485-89

GOST 26433.0-85

GOST 26433.1-89

GOST 27005-86

1.2.1.1;1.2.1.2;

This standard applies to wall small blocks made of cellular concrete (hereinafter referred to as blocks) intended for laying external, internal walls and partitions of buildings with a relative humidity of indoor air of not more than 75% and in a non-aggressive environment.

In rooms with an air humidity of more than 60%, the inner surface of the outer wall blocks must have a vapor barrier coating.

1. TECHNICAL REQUIREMENTS

1.1. Main parameters and dimensions

1.1.1. Blocks should be manufactured in accordance with the requirements of this standard for technological documentation approved in the prescribed manner.

1.1.2. The types and sizes of blocks must correspond to those indicated in Table. one.

Table 1

	Dimensions for masonry
	on solution













Notes: 1. It is allowed to manufacture blocks of other sizes at the request of the consumer, agreed with the design organization. 2. The ratio of types of blocks with an average density of concrete is given in the appendix. 3. The thickness of the blocks for masonry with glue can be, if necessary, equal to the thickness of the blocks used for masonry with mortar.

1.1.3. When ordering, the symbolic designation of blocks should consist of the designation of the type of block, class (grade) of concrete in terms of compressive strength, grade in average density, grade in frost resistance and category.

An example of a symbol for a type I block, compressive strength class B2.5, average density grade D500, frost resistance grade F35 and category 2:

The same, block type V, compressive strength class B5, average density grade D900, frost resistance grade F75 and category 1:

1.2. Characteristics

1.2.1. Requirements for materials and concrete

1.2.1.1. Materials and concrete for the manufacture of blocks must comply with the requirements of GOST 25485.

1.2.1.2. Classes (grades) of concrete in terms of compressive strength and grades of concrete in average density should not be lower than class (grade) in strength B1.5 (M25) and grades in average density not higher than D1200.

1.2.1.5. The values of shrinkage during drying, as well as the thermal conductivity of concrete blocks, should not exceed the values \u200b\u200bspecified in GOST 25485.

1.2.1.6. Release humidity of concrete blocks should not exceed (by weight) more than,%:

25 - based on sand;

35 - "" ash and other production waste.

1.2.1.7. Concrete grades for frost resistance should be, depending on the mode of their operation and the estimated winter temperatures of the outside air in the construction areas, not less than:

F25 - for blocks of external walls;

F15 - " " internal walls.

1.2.1.8. The ratio of concrete grades for average density with concrete classes for compressive strength is given in table. 2.

table 2

Concrete grade according to medium density
Concrete class according to compressive strength
th, not less

* The compressive strength ratings refer to non-autoclaved concrete blocks only.

1.2.2. The values of deviations of geometric parameters and indicators of appearance should not exceed the limit values indicated in Table. 3.

Table 3

Directory of GOSTs, TU, standards, norms and rules. SNiP, SanPiN, certification, specifications

GOST 21520-89

Group G33

INTERSTATE STANDARD

BLOCKS FROM CELLULAR CONCRETE WALL SMALL

Specifications

Small-sized wall blocks of cellular concrete. Specifications

MKS 91.080.40
OKP 58 3000

Introduction date 1990-01-01

INFORMATION DATA

1. DEVELOPED by the Research, Design and Technological Institute of Concrete and Reinforced Concrete (NIIZhB) of the State Construction Committee of the USSR, the Central Research and Design and Experimental Institute of Complex Problems of Building Structures and Structures named after V.A. Kucherenko (TsNIISK named after V.A. .Kucherenko) Gosstroy of the USSR, Research Institute of Building Physics (NIISF) Gosstroy of the USSR

INTRODUCED by the Research, Design and Technological Institute of Concrete and Reinforced Concrete (NIIZhB) of the USSR State Construction Committee

2. APPROVED AND INTRODUCED BY Decree of the State Construction Committee of the USSR of 30.03.89 N 58

3. REPLACE GOST 21520-76

4. REFERENCE REGULATIONS AND TECHNICAL DOCUMENTS


	Item number










	1.2.1.3, 2.10



	1.2.1.1, 1.2.1.5, 3.4

5. REPUBLICATION. December 2003

In rooms with an air humidity of more than 60%, the inner surface of the outer wall blocks must have a vapor barrier coating.

1. TECHNICAL REQUIREMENTS

1.1. Main parameters and dimensions

1.1.1. Blocks should be manufactured in accordance with the requirements of this standard for technological documentation approved in the prescribed manner.

1.1.2. The types and sizes of blocks must correspond to those indicated in Table 1.

Table 1


block type	Block size, mm, for masonry
	on solution













Notes: 1. It is allowed to manufacture blocks of other sizes at the request of the consumer, agreed with the design organization. 2. The ratio of types of blocks with an average density of concrete is given in the appendix. 3. The thickness of the blocks for masonry with glue can be, if necessary, equal to the thickness of the blocks used for masonry with mortar.

An example of a symbol for a type I block, compressive strength class B2.5, average density grade D500, frost resistance grade F35, category 2:

I-B2,5D500F35-2

The same, type V block, compressive strength class B5, average density grade D900, frost resistance grade F75, category 1:

V-B5D900F75-1

1.2. Characteristics

1.2.1. Requirements for materials and concrete

1.2.1.1. Materials and concrete for the manufacture of blocks must comply with the requirements of GOST 25485.

1.2.1.2. Classes (grades) of concrete in terms of compressive strength and grades of concrete in average density should not be lower than class (grade) in strength B1.5 (M25) and grades in average density not higher than D1200.

1.2.1.5. The values of shrinkage during drying, as well as the thermal conductivity of concrete blocks, should not exceed the values \u200b\u200bspecified in GOST 25485.

1.2.1.6. Release humidity of concrete blocks should not exceed, % by weight:

25 - based on sand;

35 - "" ash and other production waste.

1.2.1.7. Concrete grades for frost resistance should be, depending on the mode of their operation and the estimated winter temperatures of the outside air in the construction areas, not less than:

F25 - for blocks of external walls;

F15 - "" internal "

1.2.1.8. The ratio of concrete grades for average density with concrete classes for compressive strength is given in Table 2.

table 2


Concrete grade by average density
Compressive strength class of concrete, not less than

________________
* The compressive strength ratings refer to non-autoclaved concrete blocks only.

1.2.2. The values of deviations of geometric parameters and appearance indicators should not exceed the limit values indicated in Table 3.

Table 3


The name of the deviation of the geometric parameter	Maximum deviation of blocks, mm, for masonry category

	on glue	on solution
Deviations from linear dimensions
Deviations for:

Length, thickness
Deviation from rectangular shape(diagonal length difference)
Curvature of faces and edges
Damage to corners and ribs
Damage:
No more than two corners per block depth
Ribs on one block with a total length of not more than twice the length of the longitudinal rib and depth

Notes:

1. Damage to corners and ribs is not considered to be defects having a depth: for the 1st category - up to 3 mm, the 2nd - up to 5 mm and the 3rd - up to 10 mm.

2. The release of blocks of the 3rd category is allowed until 01/01/96

1.3. Marking

1.3.1. Batches of blocks that differ in grades of concrete in terms of average density and strength classes should be marked with indelible paint.

1.3.2. Marking should be applied to at least two blocks on opposite sides of the container or a package of numbers indicating the average density of concrete blocks and their compressive strength class. For blocks with a concrete grade in average density from D500 to D900, one first digit of the number should be applied, from D1000 to D1200 - the first two digits of the number. For example, if the blocks in the batch have a concrete grade of average density D600 and a compressive strength class of B2.5, then the numbers are applied to the blocks

6-2,5

With a concrete grade for average density D1000 and a compressive strength class of B7.5, numbers are applied

1.3.3. Each packed place must be marked with the sign "Keep away from moisture" in accordance with GOST 14192.

2. ACCEPTANCE

2.1. Acceptance of blocks - in accordance with GOST 13015.1 and this standard in batches.

2.2. The number of blocks with deviations from linear dimensions exceeding those indicated in Table 3 should not exceed 5% of the lot in total.

2.3. The number of blocks with damage to the corners and edges, exceeding those indicated in Table 3, should not exceed 5% of the lot in total.

2.4. The number of blocks with cracks crossing more than two faces, as well as blocks with cracks along four faces, should not exceed 5% of the batch in total.

2.5. Blocks are accepted according to the data of acceptance and periodic control.

Blocks are accepted according to the results of acceptance tests in terms of compressive strength, average density, release moisture and geometric parameters.

2.6. The consumer has the right to conduct a control check of the compliance of the blocks specified in the order with the requirements of this standard, using the control procedure specified in clauses 2.7 and 2.8.

2.7. For the control check of the blocks for compliance with the requirements of clause 1.2.2, at least 30 blocks are selected from the batch from the outer and inner rows of containers or stacks.

With a vertical cutting scheme, the control check of the blocks is carried out:

In terms of average density, compressive strength and release moisture - at least two blocks from different arrays;

In terms of frost resistance - at least six blocks from the middle part of one array;

With a horizontal cutting scheme, the control check of the blocks is carried out:

In terms of average density, compressive strength and release moisture - at least two blocks from each layer of different arrays;

In terms of frost resistance - at least three blocks from the middle row, and in case of two-row cutting - the upper row of one array;

By shrinkage during drying - one block at a time.

2.8. If the control results are unsatisfactory for at least one of the indicators, a second check is carried out for this indicator of the double number of samples of the controlled lot.

In case of unsatisfactory results of the re-check in terms of geometric parameters, the acceptance of blocks is carried out individually.

Upon receipt of reduced results of a re-test in terms of strength and frost resistance, a batch of blocks is accepted according to the obtained indicators during control.

Upon receipt of underestimated or overestimated by one grade values for the average density of concrete, a batch of blocks is accepted according to the obtained indicators during control.

2.9. Blocks in the package must be non-sticky and freely disassembled by hand.

2.10. Concrete strength control is carried out according to GOST 18105, and medium density - according to GOST 27005.

2.11. Each batch of blocks is accompanied by a quality document, which indicates:

Name and address of the manufacturer;

Conditional designation of blocks;

The designation of this standard;

Number and date of issue of the quality document;

Batch number, volume and/or number of blocks shipped.

3. CONTROL METHODS

3.1. The dimensions, the difference in the lengths of the diagonals, the curvature of the faces and edges are checked in accordance with GOST 13015.0 and GOST 26433.0.

3.2. All measuring instruments used must be at least 2nd class of accuracy.

It is allowed to use special non-standardized measuring instruments that have passed metrological certification in accordance with the requirements of GOST 8.326 *.
________________
* PR 50.2.009-94 is in force on the territory of the Russian Federation **.

** The document is not valid on the territory of the Russian Federation. The Regulations on the implementation of state metrological supervision are in force (Decree of the Government of the Russian Federation of April 6, 2011 N 246). - Database manufacturer's note.

3.3. The control of the damage depth of the ribs and corners is carried out by measuring the perpendicular lowered from the top of the corner or from the rib to the conditional plane of the defect, in accordance with the scheme for measuring the depth of damage to the corners and edges of the blocks with a depth gauge according to

GOST 21520– 89

INTERSTATE STANDARD

BLOCKS FROM CELLULAR CONCRETE WALL SMALL

Specifications

GOST 21520– 89

Small-sized wall blocks of cellular cancrete. Specifications

Date of introduction: 01.01.1990

In rooms with an air humidity of more than 60%, the inner surface of the outer wall blocks must have a vapor barrier coating.

1. TECHNICAL REQUIREMENTS

1.1. Main parameters and dimensions

1.1.1. Blocks should be manufactured in accordance with the requirements of this standard for technological documentation approved in the prescribed manner.

1.1.2. The types and sizes of blocks must correspond to those indicated in Table. one.

Table 1

Types	Masonry dimensions, mm
	on solution			on glue
	height	thickness	length	height	thickness	length










Notes: 1. It is allowed to manufacture blocks of other sizes at the request of the consumer, agreed with the design organization. 2. The ratio of types of blocks with an average density of concrete is given in the appendix. 3. The thickness of the blocks for masonry with glue can be, if necessary, equal to the thickness of the blocks used for masonry with mortar.

1.1.3. When ordering, the symbolic designation of blocks should consist of the designation of the type of block, class (grade) of concrete in terms of compressive strength, grade in average density, grade in frost resistance and category.

Symbol example type I block, compressive strength class B2.5, average density grade D500, frost resistance grade F35 and category 2:

I-B2,5D500F35-2

The same, block type V, compressive strength class B5, average density grade D900, frost resistance grade F75 and category 1.

V-B5D900F75-1

1.2. Characteristics

1.2.1. Requirements for materials and concrete

1.2.1.1. Materials and concrete for the manufacture of blocks must comply with the requirements of GOST 25485.

1.2.1.2. Classes (grades) of concrete in terms of compressive strength and grades of concrete in average density should not be lower than class (grade) in strength B1.5 (M25) and grades in average density not more than D1200.

1.2.1.3. The actual strength of concrete must correspond to the required one, assigned in accordance with GOST 18105, depending on the normalized strength of concrete specified in the order, and on the indicators of the actual uniformity of concrete strength.

1.2.1.4. The actual average density of concrete must correspond to the required one, assigned in accordance with GOST 27005, depending on the normalized average density specified in the order, and on the indicators of the actual uniformity of concrete density.

1.2.1.5 . The values of shrinkage during drying, as well as the thermal conductivity of concrete blocks, should not exceed the values \u200b\u200bspecified in GOST 25485.

1.2.1.6. Release humidity of concrete blocks should not exceed (by weight) more than,%:

25 - based on sand;

35 - based on ash and other production waste.

1.2.1.7. Concrete grades for frost resistance should be, depending on the mode of their operation and the estimated winter temperatures of the outside air in the construction areas, not less than:

F25 - for blocks of external walls;

F15 - for blocks of internal walls.

1.2.1.8. The ratio of concrete grades for average density with concrete classes for compressive strength is given in table. 2.

Table 2


Concrete class according to strength on compression, not less

––––––––––

* The compressive strength ratings refer to non-autoclaved concrete blocks only.

1.2.2 . The values of deviations of geometric parameters and indicators of appearance should not exceed the limit values indicated in Table. 3.

Table 3

The name of the deviation of the geometric parameter	Limit deviations, mm masonry blocks category
	category 1	category 2	category 3
	on glue	on solution
Deviations from linear dimensions
Deviations for: length, thickness
Deviation from a rectangular shape (diagonal length difference)	2	4	6
Curvature of faces and edges	1	3	5
Damage to corners and ribs
corners (no more than two) on one block with a depth	5	10	15
ribs on one block with a total length of not more than twice the length of the longitudinal rib and depth	5	10	15
Notes: 1. Damage to corners and ribs is not considered to be defects having a depth: for the 1st category - up to 3 mm, the 2nd - up to 5 mm and the 3rd - up to 10 mm. 2. The release of blocks of the 3rd category is allowed until 01.01.96.

1.3. Marking

1.3.1. Batches of blocks that differ in grades of concrete in terms of average density and strength classes should be marked with indelible paint.

1.3.2 . Marking should be applied to at least two blocks (on opposite sides of the container or package) with numbers indicating the average concrete density of the blocks and their compressive strength class. For blocks with a concrete grade in average density from D500 to D900, one first digit of the number should be applied, from D1000 to D1200 - the first two digits of the number. For example: if the blocks in the batch have a concrete grade for average density D600 and a compressive strength class of B2.5, then numbers are applied to the blocks

6 – 2,5

With a concrete grade for average density D1000 and a compressive strength class of B7.5, numbers are applied

10 –7,5

1.3.3. Each packed place must be marked with the sign "Afraid of moisture" in accordance with GOST 14192.

2. ACCEPTANCE

2.1. Acceptance of blocks - in accordance with GOST 13015.1 and this standard in batches.

2.2. The number of blocks with deviations from linear dimensions exceeding those indicated in Table. 3 shall not exceed 5% of the lot in total.

2.3. The number of blocks with damage to the corners and ribs exceeding those indicated in Table. 3 shall not exceed 5% of the lot in total.

2.4. The number of blocks with cracks crossing more than two faces, as well as blocks with cracks along four faces, should not exceed 5% of the lot in total.

2.5. Blocks are accepted according to the data of acceptance and periodic control.

Blocks are accepted according to the results of acceptance tests in terms of compressive strength, average density, release moisture and geometric parameters.

Control of blocks for frost resistance, thermal conductivity and shrinkage during drying is carried out before the start of mass production, when the technology or quality of materials changes, but at least once a year - in terms of thermal conductivity and shrinkage during drying and once every 6 months - in terms of frost resistance.

2.6. The consumer has the right to conduct a control check of the compliance of the blocks specified in the order with the requirements of this standard, using the product control procedure specified in paragraphs. 2.7 and 2.8.

2.7. For the control check of blocks for compliance with the requirements of clause 1.2.2 of this standard, at least 30 blocks are selected from the batch from the outer and inner rows of containers or stacks.

With a vertical cutting scheme, the control check of the blocks is carried out:

In terms of average density, compressive strength and release moisture - at least two blocks from different arrays;

In terms of frost resistance - at least six blocks from the middle part of one array;

With a horizontal cutting scheme, the control check of the blocks is carried out:

In terms of average density, compressive strength and release moisture - at least two blocks from each layer from different arrays;

In terms of frost resistance - at least three blocks from the middle row, and with a two-row cutting of the upper row of one array;

By shrinkage during drying - one block at a time.

2.8. If the control results are unsatisfactory for at least one of the indicators, a second check is carried out for this indicator of the double number of samples of the controlled lot.

In case of unsatisfactory results of the re-check in terms of geometric parameters, the acceptance of blocks is carried out individually.

Upon receipt of reduced results of a re-test in terms of strength and frost resistance, a batch of blocks is accepted according to the results obtained during control.

In case of underestimated or overestimated by one grade values for the average density of concrete, a batch of blocks is accepted according to the obtained indicators during control.

2.9. Blocks in the package must be non-sticky and freely disassembled by hand.

2.10. Concrete strength control is carried out according to GOST 18105, and medium density - according to GOST 27005.

2.11. Each batch of blocks is accompanied by a quality document, which indicates:

Name and address of the manufacturer;

Conditional designation of blocks;

The designation of this standard;

Number and date of issue of the quality document;

Batch number, volume and/or number of blocks shipped;

Price (for retail products).

3. CONTROL METHODS

3.1. The dimensions, the difference in the lengths of the diagonals, the curvature of the faces and edges are checked by methods in accordance with GOST 13015, GOST 26433.0 and GOST 26433.1.

3.2. All measuring instruments used must be at least 2nd class of accuracy.

It is allowed to use special non-standardized measuring instruments that have passed metrological certification in accordance with the requirements of GOST 8.326.

3.3. The control of the damage depth of the ribs and corners is carried out by measuring the perpendicular, lowered from the top of the corner or from the rib to the conditional plane of the defect, in accordance with the scheme for measuring the depth of damage to the corners and edges of the blocks with a depth gauge according to GOST 162.

3.4. The technical characteristics of the blocks are controlled in accordance with the requirements of the following standards:

Compressive strength - according to GOST 10180;

Average density - according to GOST 12730.1;

Frost resistance - according to GOST 25485;

Shrinkage during drying - according to GOST 25485;

Thermal conductivity of concrete blocks - according to GOST 7076;

Release humidity - according to GOST 12730.2, GOST 21718.

Scheme for measuring the depth of damagecorners and edges of blocks

4. TRANSPORT AND STORAGE

4.1. Blocks are transported in containers in accordance with GOST 20259 or on pallets in accordance with GOST 18343 with rigid fixation with a shrink film or bandaging them with steel tape in accordance with GOST 3560 or other fastening that ensures the immobility and safety of the blocks.

4.2. Transportation of blocks is carried out by any type of transport in accordance with the requirements of GOST 9238 and the Specifications for loading and securing cargo.

4.3. It is forbidden to load blocks in bulk and unload them by dropping them.

4.4. Blocks should be stored sorted by types, categories, strength classes, grades by average density and stacked in stacks no more than 2.5 m high. Blocks should be protected from moisture.

RATIO OF TYPES OF BLOCKS WITH AVERAGE DENSITY OF CONCRETE

block type	Concrete grade by average density
	D500 D600 D700	D800	D900	D1000	D1100	D1200
I	x	-	-	-	-	-
II		x
III			x
IV		-	-
V		x	x	x	x	x
VI						-
VII					-
VIII					x
IX
X						x
Note. The "-" sign means that it is not recommended to use.

INFORMATION DATA

1. DEVELOPED by the Research, Design and Technological Institute of Concrete and Reinforced Concrete (NIIZhB) of the State Construction Committee of the USSR, the Central Research and Design and Experimental Institute of Complex Problems of Building Structures and Structures named after V. A. Kucherenko (TsNIISK named after Kucherenko) of the State Construction Committee USSR, Research Institute of Building Physics (NIISF) Gosstroy of the USSR

State Construction Committee of the Estonian SSR

PERFORMERS A. M. Krokhin, Ph.D. tech. sciences (topic leader); R. L. Serykh, Dr. Tech. sciences; I. M. Drobyashchenko, Ph.D. tech. sciences; N. I. Levin, Ph.D. tech. sciences; L. I. Ostrat, Ph.D. tech. sciences; V. G. Gagarin, Ph.D. tech. sciences; A. I. Ananiev, Ph.D. tech. sciences; T. A. Ukhova, Ph.D. tech. sciences; R. M. Koltovskaya; I. N. Nagornyak

INTRODUCED by the Research, Design and Technological Institute of Concrete and Reinforced Concrete (NIIZhB) of the USSR State Construction Committee

2. APPROVED AND INTRODUCED BY Decree of the State Construction Committee of the USSR dated March 30, 1989 No. 58

3. REPLACE GOST 21520-76

4. DATE OF VERIFICATION 1996

5. REFERENCE REGULATIONS AND TECHNICAL DOCUMENTS

	Number of paragraph, subparagraph		Number of paragraph, subparagraph
GOST 8.326-89		GOST 14192-96
		GOST 18105-86
GOST 3560-73		GOST 18343-80
GOST 9238-83		GOST 20259-80
GOST 10180-90		GOST 21718-84
GOST 12730.1-78		GOST 25485-89	1.2.1.1; 1.2.1.2; 1.2.1.5; 3.4
GOST 12730.2-83		GOST 26433.0-85
GOST 13015.0-83		GOST 27005-86
GOST 13015.1-81

Failure to comply with the standard is punishable by law!

CELLULAR CONCRETE BLOCKS
WALL SMALL

TECHNICAL CONDITIONS

GOST 21520-89

USSR STATE CONSTRUCTION COMMITTEE

Moscow

STATE STANDARD OF THE UNION OF THE SSR

Introduction date 01.01.90

In rooms with an air humidity of more than 60%, the inner surface of the outer wall blocks must have a vapor barrier coating.

1. TECHNICAL REQUIREMENTS

1.1. Main parameters and dimensions

1.1.1. Blocks should be manufactured in accordance with the requirements of this standard for technological documentation approved in the prescribed manner.

1.1.2. The types and sizes of blocks must correspond to those indicated in Table. one .

Table 1

	Dimensions for masonry
	on solution			on glue
	height	thickness	length	height	thickness	length
	188	300	588	198	295	598
		250			245
		200			195
III	288			298
	188		388	198		398
	288		288	298		298
		250			245
	144	300	588
VII	119	250
VIII		300			295	598

Notes :

1. It is allowed to manufacture blocks of other sizes at the request of the consumer, agreed with the design organization.

2. The ratio of types of blocks with an average density of concrete is given in the appendix.

3. The thickness of the blocks for masonry with glue can be, if necessary, equal to the thickness of the blocks used for masonry with mortar.

Symbol example block type I , class for compressive strength B2.5, grades for medium density D 500, frost resistance grades F 35 and category 2:

I- B 2.5D500F35-2

Same type V , class for compressive strength B5, grades for medium density D 900, frost resistance grades F 75 and category 1.

V - B 5 D 900 F 75-1

1.2. Characteristics

1.2.1.Requirements for materials and concrete

1.2.1.1. Materials and concrete for the manufacture of blocks must comply with the requirementsGOST 25485.

1.2.1.2. Classes (grades) of concrete in terms of compressive strength and grades of concrete in average density should not be lower than class (grade) in strength B1.5 (M25) and grades in average density not higher D 1200.

1.2.1.3. The actual strength of concrete must correspond to the required, assigned according toGOST 18105depending on the normalized strength of concrete specified in the order, and on the indicators of the actual uniformity of concrete strength.

1.2.1.4. The actual average density of concrete must correspond to the required one, assigned according toGOST 27005depending on the normalized average density specified in the order, and on the indicators of the actual density uniformity of concrete.

1.2.1.5. The values of shrinkage during drying, as well as the thermal conductivity of concrete blocks, should not exceed the values \u200b\u200bspecified inGOST 25485.

1.2.1.6. Release humidity of concrete blocks should not exceed (by weight) more than,%:

25 - based on sand;

35 - based on ash and other production waste.

1.2.1.7. Concrete grades for frost resistance should be, depending on the mode of their operation and the estimated winter temperatures of the outside air in the construction areas, not less than:

F 25 - for blocks of external walls;

F 15 - for blocks of internal walls.

1.2.1.8. The ratio of concrete grades for average density with concrete classes for compressive strength is given in table. 2.

Table 2

Concrete grade by average density	D500	D600	D700	D800	D900	D 1000	D 1100	D 1200
Compressive strength class of concrete, not less than	B3.5			B7.5	B7.5*	B7.5*	AT 10 O'CLOCK*	B12.5*
	B2.5	B3.5	B3.5		AT 5*	AT 5*	B7.5*	AT 10 O'CLOCK*
		B2.5	B2.5	B3.5	B3.5*
	B1.5		IN 2*	B2.5	B2.5*

* Compressive strength ratings refer to non-autoclaved concrete blocks only.

1.2.2. The values of deviations of geometric parameters and indicators of appearance should not exceed the limit values indicated in Table. 3 .

Table 3

The name of the deviation of the geometric parameter	Previous off
	Blocks for laying on glue	Mortar masonry blocks

Deviations from linear dimensions
Deviations for:
height	± 1	± 3	± 5
length, thickness	± 2	± 4	± 6
Deviation from a rectangular shape (diagonal length difference)
Curvature of faces and edges
Damage to corners and ribs
Damage:
no more than two corners on one block with a depth
ribs on one block with a total length of not more than twice the length of the longitudinal rib and depth

Notes:

2. The release of blocks of the 3rd category is allowed until 01.01.96.

1.3. Marking

1.3.1. Batches of blocks that differ in grades of concrete in terms of average density and strength classes should be marked with indelible paint.

1.3.2. Marking should be applied to at least two blocks (on opposite sides of the container or package) with numbers indicating the average density of concrete blocks and the compressive strength class. For blocks with a brand of concrete in average density from D 500 to D 900 should be applied one first digit of the number, from D 1000 to D 1200 - the first two digits of the number, for example: if the blocks in the batch have a concrete grade for average density D 600 and compressive strength class B2.5, then numbers are applied to the blocks

6-2,5.

With a brand of concrete by average density D 1000 and compressive strength class B7.5 are marked with numbers

10-7,5.

1.3.3. Each packaged item must be marked "Afraid of moisture" according toGOST 14192.

2. ACCEPTANCE

2.1. Acceptance of blocks - byGOST 13015.1and this standard in batches.

2.2. The number of blocks with deviations from linear dimensions exceeding those indicated in Table. 3 should not exceed 5% of the batch in total.

2.3. The number of blocks with damage to the corners and ribs exceeding those indicated in Table. 3 should not exceed 5% of the batch in total.

2.4. The number of blocks with cracks crossing more than two faces, as well as blocks with cracks along four faces, should not exceed 5% of the lot in total.

2.5. Blocks are accepted according to the data of acceptance and periodic control.

Blocks are accepted according to the results of acceptance tests in terms of compressive strength, average density, release moisture and geometric parameters.

2.6. The consumer has the right to conduct a control check of the compliance of the blocks specified in the order with the requirements of this standard, using the product control procedure specified in paragraphs. 2.7 and 2.8.

2.7. For the control check of blocks for compliance with the requirements of paragraph.1.2 . of this standard, at least 30 blocks are selected from the batch from the outer and inner rows of containers or stacks.

With vertical cutting pattern

in terms of average density, compressive strength and release moisture - at least two blocks from different arrays;

in terms of frost resistance - at least six blocks from the middle part of one array;

With a horizontal cutting patterncontrol check of blocks is carried out:

in terms of average density, compressive strength and release moisture - at least two blocks from each layer from different arrays;

in terms of frost resistance - at least three blocks from the middle row, and in case of two-row cutting - the upper row of one array;

on shrinkage during drying - one block at a time.

2.8. If the control results are unsatisfactory for at least one of the indicators, a second check is carried out for this indicator of the double number of samples of the controlled lot.

In case of unsatisfactory results of the re-check in terms of geometric parameters, the acceptance of blocks is carried out individually.

Upon receipt of reduced results of a re-test in terms of strength and frost resistance, a batch of blocks is accepted according to the results obtained during control.

In case of underestimated or overestimated by one grade values for the average density of concrete, a batch of blocks is accepted according to the obtained indicators during control.

2.9. Blocks in the package must be non-sticky and freely disassembled by hand.

2.10. Concrete strength control is carried out according toGOST 18105, and the average density - according toGOST 27005.

2.11. Each batch of blocks is accompanied by a quality document, which indicates:

name and address of the manufacturer;

conditional designation of blocks;

designation of this standard;

number and date of issue of the quality document;

batch number, volume and/or number of blocks shipped;

price (for products supplied to retailers).

3. CONTROL METHODS

3.1. The dimensions, the difference in the lengths of the diagonals, the curvature of the faces and edges are checked by methods according toGOST 13015, GOST 26433.0andGOST 26433.1.

3.2. All measuring instruments used must be at least 2nd class of accuracy.

It is allowed to use special non-standardized measuring instruments that have passed metrological certification in accordance with the requirements of GOST 8.326.

3.4. The technical characteristics of the blocks are controlled in accordance with the requirements of the following standards:

compressive strength - according to GOST 10180;

average density - according to GOST 12730.1;

frost resistance - according to GOST 25485;

drying shrinkage - according to GOST 25485;

thermal conductivity of concrete blocks - according to GOST 7076;

release humidity - according to GOST 12730.2, GOST 21718.

Scheme for measuring the depth of damage to the corners and edges of blocks

4. TRANSPORT AND STORAGE

4.1. Blocks are shipped in containersGOST 20259or on palletsGOST 18343with rigid fixation with shrink film or bandaging them with steel tape alongGOST 3560or other fastening that ensures the immobility and safety of the blocks.

4.2. Transportation of blocks is carried out by transport of any type in accordance with the requirementsGOST 9238and the Technical Conditions for Loading and Securing Cargoes.

4.3. It is forbidden to load blocks in bulk and unload them by dropping them.

4.4. Blocks should be stored sorted by types, categories, strength classes, grades by average density and stacked in stacks no more than 2.5 m high. Blocks should be protected from moisture.

APPENDIX

RATIO OF TYPES OF BLOCKS WITH AVERAGE DENSITY OF CONCRETE

	Concrete grade by average density
	D500	D600	D700	D800	D900	D 1000	D1100	D1200







VIII

Note. The "-" sign means that it is not recommended to use.

INFORMATION DATA

1. DEVELOPED by the Research, Design and Technological Institute of Concrete and Reinforced Concrete (NIIZhB) of the USSR State Construction Committee

Central Research and Design and Experimental Institute of Complex Problems of Building Structures and Structures named after V. A. Kucherenko (TsNIISK named after Kucherenko) of the State Construction Committee of the USSR

Research Institute of Building Physics (NIISF) Gosstroy of the USSR

State Construction Committee of the ESSR

PERFORMERS

A. M. Krokhin,cand. tech. sciences (topic leader); R. L. Serykh, Dr. tech. sciences; I. M. Drobyashchenko, cand. tech. sciences; N. I. Levin, cand. tech. sciences; L. I. Ostrat, cand. tech. sciences; V. G. Gagarin, cand. tech. sciences; A. I. Ananiev, cand. tech. sciences; T. A. Ukhova, cand. tech. sciences; R. M. Koltovskaya; I. N. Nagornyak

2. INTRODUCED by the Research, Design and Technological Institute of Concrete and Reinforced Concrete (NIIZhB) of the USSR State Construction Committee

3. APPROVED AND INTRODUCED BY Decree of the State Construction Committee of the USSR dated March 30, 1989 No. 58

4. REPLACE GOST 21520-76

5. DATE OF VERIFICATION - 1996

6. REFERENCE REGULATIONS AND TECHNICAL DOCUMENTS

	Number of paragraph, subparagraph
GOST 8.326-78
GOST 162-80
GOST 3560-73
GOST 7076-87
GOST 9238-83
GOST 10180-89
GOST 12730.1-78
GOST 12730.2-78
GOST 13015-75
GOST 13015.1-81		1. Technical requirements . 1 2. Acceptance . 4 3. Control methods . 5 4. Transportation and storage . 6 Appendix Ratio of Block Types with Average Concrete Density . 6

Categories

Popular