Road plates GOST 21924.0.84. Sale of road plates. Detail of the corrugation on the working surface of the plates

State standard of the USSR GOST 21924.0-84

"REINFORCED CONCRETE PLATES FOR COVERINGS OF CITY ROADS. SPECIFICATIONS"

With changes:

Reinforced concrete slabs for pavements of city roads. Specifications

Instead of GOST 21924-76

This standard applies to reinforced concrete prestressed slabs and slabs with non-tensioned reinforcement, made of heavy concrete and intended for the installation of prefabricated pavements of permanent and temporary city roads for the vehicle load H-30 and H-10.

The slabs are used for roads in areas with an estimated outdoor air temperature (the average coldest five-day period of the construction area according to SNiP 2.01.01-82) up to minus 40 ° C inclusive.

When using plates in the IVA climatic subregion, additional requirements of SNiP 2.03.01-84 for structures intended for operation in this region should be taken into account.

It is allowed to use these plates for roads in areas with an estimated outdoor air temperature below minus 40 ° C, subject to the requirements of SNiP 2.03.01-84 for structures intended for operation in these conditions.

The standard does not apply to reinforced concrete slabs for internal roads of industrial enterprises, for on-farm roads according to SNiP 2.05.07-85, as well as to reusable slabs for temporary roads at construction sites.

1. Types, basic parameters and dimensions

1.1. Plates are divided into types depending on:

from destination:

1 - for permanent roads,

2 - for temporary roads;

from configuration:

P - rectangular,

PB - rectangular with one combined board;

PBB - rectangular with two combined sides;

PT - trapezoidal;

ПШ - hexagonal;

ПШД - hexagonal axial diagonal;

ПШП - hexagonal axial transverse;

DPSh - diagonal half of a hexagonal plate;

PPSh - the transverse half of a hexagonal plate.

1.2. The shape and main dimensions of the plates must correspond to those indicated in Fig. 1-6 and in table. 1-2.

Temporary road slabs are manufactured without SkI mounting brackets. It is allowed not to arrange niches for mounting brackets in these plates.

By agreement with the consumer, it is allowed to manufacture plates of type P and PT with grooves for loopless mounting in accordance with Fig. 7 or with holes for collets instead of mounting loops and niches for them. At the same time, in prestressed slabs for permanent roads, instead of mounting loops, it is necessary to install SkI brackets in accordance with Fig. 6 (node ​​1). The number of holes for collets and their location is determined based on the technology of manufacturing plates and their installation.

The working surface of the slabs (the upper surface of the road surface) must have a corrugation according to drawing 8, and the slabs produced by this surface "up" must be rough (clause 2.9.2)

Notes:

1. It is allowed to manufacture plates with a chamfer of no more than 10 mm on the front surface of the plate.

2. It is allowed to manufacture plates with technological bevels in the places of installation of mounting loops and brackets no more than 5 mm, as well as with technological niches under SkI brackets with a depth of 20 mm.

3. Inventory slabs for temporary roads are allowed to be manufactured with technological bevels no more than 8 mm.

4. It is allowed to manufacture plates with a general view on existing equipment, different from that indicated in drawings 1 - 8, while maintaining the overall dimensions of the plate and subject to all other requirements established by this standard.

5. For hingeless slabs (Fig. 7), changes in the shape of the slabs associated with the technology of their manufacture (the presence and size of chamfers, curvature radii, etc.) are allowed.

6. For slabs with non-stressed reinforcement, mounting loops may be vertical.

7. It is allowed to shift the mounting loops within the niches from the middle of the slab along its edge to the position of the mirror-replaced hinge bindings (dimensions a and b) according to fig. 6.

Detail of the corrugation on the working surface of the plates

Table 1.

Plate size	Plate dimensions, mm									Plate weight (reference), t
			Plate thickness h (h 1)
			prestressed	with non-tensioned reinforcement

Note. The weight of the slabs is given for concrete with an average density of 2500 kg/m 3 .

Table 2.

Plate size	Node number according to hell. 6

1.3. The slabs are designed for the passage of vehicles weighing 30 and 10 tons. In this case, the dynamic coefficient is taken equal to 1, 2, and the modulus of deformation of the base when calculating the slabs:

for permanent roads - 60 MPa (500 kgf / cm 2);

for temporary roads - 25 MPa (250 kgf / cm 2).

1.4. The design of the plates is given:

prestressed plates - in GOST 21924.1-84;

slabs with non-stressed reinforcement - in GOST 21924.2-84.

1.5. Plates are made with mounting loops and holes for collets (Fig. 1-6) or grooves for loopless mounting (Fig. 7).

The hinges should not protrude beyond the working surface of the edge of the slab.

For lifting and mounting of loopless plates, special gripping devices or collet grippers should be used, the design of which is accepted by the manufacturer in agreement with the consumer and the USSR Gosgortekhnadzor.

1.6. Plates are marked with marks in accordance with GOST 23009-78.

The slab brand consists of alphanumeric groups separated by a hyphen.

The first group contains the type designation of the slab (clause 1.1) and its nominal dimensions in decimeters (with values ​​rounded to the nearest whole number):

for rectangular slabs - length and width;

for trapezoidal plates - length;

for hexagonal slabs - diagonal.

In the second group, the value of the load for which the plate is designed is given (clause 1.3).

For prestressed slabs in the second group of grades, a class of prestressed reinforcing steel is also given.

The brand of plates manufactured with grooves for loopless mounting or with holes for collets (instead of mounting loops) is supplemented with the letter B.

An example of a symbol (brand):

slabs for permanent roads (type 1), rectangular, 6000 mm long and 1750 mm wide, designed for a vehicle weighing 30 tons, with prestressing reinforcement made of class A-V reinforcing steel:

The same, trapezoidal, 5500 mm long, designed for a car weighing 30 tons, with prestressing reinforcement made of class A-IV reinforcing steel:

The same, hexagonal with a side of 1160 mm, designed for a car weighing 30 tons, with non-tensioned reinforcement:

The same, slabs for temporary roads (type 2), rectangular, 3000 mm long and 1750 mm wide, designed for a car weighing 10 tons, with non-stressed reinforcement:

2. Technical requirements

2.1. Plates should be manufactured in accordance with the requirements of this standard and technological documentation approved in the prescribed manner, according to the drawings given in GOST 21924.1-84 and GOST 21924.2-84.

2.2. Plates are subject to manufacture in forms that ensure compliance with the requirements established by this standard for the quality and accuracy of the manufacture of plates.

2.3. Boards shall be factory prepared in accordance with the requirements of this standard.

2.4. Plates in terms of strength and crack resistance must withstand the control loads specified in GOST 21924.1-84 and GOST 21924.2-84.

2.5. Plates must meet the requirements of GOST 13015.0-83:

according to the indicators of the actual strength of concrete (at the design age, vacation and transfer age);

to the quality of materials used for the preparation of concrete;

to the quality of reinforcing and embedded products and their position in the slab;

by grades of reinforcing steel;

by steel grades for embedded products and mounting loops;

by the deviation of the thickness of the protective layer of concrete to the reinforcement.

2.6. concrete requirements.

2.6.1. Slabs should be made of heavy concrete of medium density over 2200 to 2500 kg / m 3 inclusive of compressive strength classes and bending tensile strength grades specified in GOST 21924.1-84 and GOST 21924.2-84.

Concrete must meet the requirements of GOST 26633-85.

2.6.2. Excluded.

2.6.3. The value of the normalized tempering strength of concrete should be taken equal to 70% of the concrete class in terms of compressive strength and the grade of concrete in terms of tensile strength in bending. When slabs are supplied in the cold season (according to GOST 13015.0-83), the value of the normalized tempering strength of concrete can be increased, but not more than 90% of the compressive strength class and the tensile strength grade in bending, and for slabs intended for temporary roads , - up to 100%.

The value of the normalized tempering strength of concrete must correspond to that specified in the order for the manufacture of slabs in accordance with the design documentation for a particular structure.

2.6.4. The normalized transfer strength of concrete of prestressed slabs is 70% of the concrete class in terms of compressive strength.

The transfer of compression forces to concrete (reinforcement tension release) should be carried out after the concrete reaches the required transfer strength.

2.6.5. Concrete grades for frost resistance and water resistance are accepted for slabs intended for permanent roads in areas with an average monthly design temperature of the coldest month (according to SNiP 2.01.01-82), respectively:

up to minus 5°C incl. - F100 and W2;

below minus 5 to minus 15°C incl. - F150 and W4;

below minus 15°С - F200 and W4.

Concrete grades for frost resistance and water resistance for slabs intended for temporary roads in areas with an average monthly design temperature of the coldest month:

up to minus 5 °С incl. - F75 and W2;

below minus 5°С to minus 15°С inclusive - F100 and W2;

below minus 15°С - F150 and W2.

Concrete grades for frost resistance and water resistance are indicated in the order for the manufacture of slabs in accordance with the established design documentation for a particular structure.

2.6.6. Concrete slabs should have a water absorption of no more than 5% by weight.

2.6.7. The temperature of isothermal exposure during heat and moisture treatment of plates should not exceed 70°C.

2.6.8. For the preparation of concrete, Portland cement should be used in accordance with GOST 10178-85 with additional requirements for concrete pavements.

It is allowed to use Portland cement according to TU 21-20-51-83.

Aggregates - in accordance with GOST 10268-80 (grain size of coarse aggregate is not more than 20 mm).

2.6.9. Plasticizing and air-entraining (gas-forming) additives used for the preparation of concrete must meet the requirements of normative and technical documentation approved in the prescribed manner.

2.7. Requirements for fittings and fittings.

2.7.1. As prestressed reinforcement of prestressed slabs, rod thermomechanically hardened reinforcing steel of classes At-V, At-IV and AT-IVC and hot-rolled classes - A-V and At-IV should be used.

Non-weldable reinforcing steel of classes At-V and At-IV should be used in the form of whole rods of a fixed length without welded joints.

2.7.2. As non-tensioned reinforcement, reinforcing wire of class VR-I and bar reinforcing steel of classes At-IIIC, A-III and A-I should be used.

2.7.3. Excluded.

2.7.4. Reinforcing steel must meet the requirements:

bar reinforcing steel of classes A-V, A-IV, A-III and A-I - GOST 5781-82;

thermomechanically and thermally hardened reinforcing steel of classes At-V, At-IV, At-IVC and At-IIIC - according to GOST 10884-81;

reinforcing wire class Вр-I - GOST 6727-80.

2.7.5. The shape and dimensions of reinforcing products for slabs must comply with those given in GOST 21924.3-84.

2.7.6. Reinforcing products must meet the requirements of GOST 10922-75.

2.7.7. The values ​​of stresses in the prestressing reinforcement, controlled after the end of its tension on the stops, and the maximum deviations of these stresses - according to GOST 21924.1-84.

2.8. Requirements for the accuracy of plate manufacturing.

2.8.1. The values ​​of actual deviations of geometric parameters should not exceed the limit values ​​indicated in Table 3.

Table 3

Type of geometric parameter deviation	Geometric parameter and its nominal value	Previous off, mm, for plates
		permanent roads	temporary roads
Deviation from linear dimension	Plate length and width:
	Up to 2.5 m incl.
	St. 2, 5 to 4, 0 m incl.
	Plate thickness
	Dimensions of recesses (mounting and butt elements)
	The size that determines the position of embedded products:
	In the plane of the slab
	From the plane of the slab
Straightness deviation	The straightness of the profile of the upper surface of the slab in any section along the entire length or width:
	Up to 2.5 m incl.
	St. 2, 5 to 4, 0 m incl.
Flatness deviation	The flatness of the front surface of the slab (when measured from a conditional plane passing through three extreme points) with the length of the slab:
	Up to 2.5 m incl.
	St. 2, 5 to 4, 0 m incl.
Deviation from squareness	Perpendicularity of adjacent end faces of slabs in a section of length:
Deviation from equality of diagonals	The difference in the lengths of the diagonals of the front surfaces of the plates at their largest size (length and width):
	Up to 4.0 m incl.

2.9. Requirements for the quality of surfaces and the appearance of plates.

2.9.1. The corrugation of the plate surface is formed by using the form of sheet corrugations of steel according to GOST 8568-77 with rhombic corrugation as the bottom of the pallet. Reef depth - not less than 1.0 mm.

The corrugated surface of the plate in slices has a clear corrugation pattern without groove edges.

The roughness of the working surface of the plates produced by this surface "up" is obtained by surface treatment (after compaction of the concrete mixture) with nylon brushes or tarpaulin tape.

2.9.2. The dimensions of shells and local sags on the working surface of the stove should not exceed:

according to the diameter or the largest size of the shells ........ 15 mm

according to the depth of the shells and the height of local influxes ....... 10 mm.

The dimensions of the sinks on the non-working surface and the side faces of the slab should not exceed 20 mm in diameter or the largest size.

The holes in the concrete of the rib (with their total length per 1 m of the rib up to 100 mm) should not exceed 10 mm in depth, measured along the working surface of the slab, and 20 mm - along the non-working surface of the slab.

2.9.3. Cracks on the surfaces of the slabs are not allowed, except for surface shrinkage and technological ones with a width of not more than 0.1 mm and a length of not more than 50 mm in the amount of not more than five per 1.5 m 2 of the slab surface.

3. Acceptance rules

3.1. Plates should be accepted in batches in accordance with the requirements of GOST 13015.1-81 and this standard.

Testing of plates for strength and crack resistance by loading is carried out before the start of their mass production, when making structural changes to them or changing the manufacturing technology of plates.

3.2. Acceptance of plates in terms of concrete strength (class of compressive strength, tempering and transfer strength), location of reinforcement and tension of prestressing reinforcement), conformity of reinforcing products, strength of welded joints, thickness of the concrete protective layer to reinforcement, accuracy of geometric parameters, quality of surfaces should be carried out according to the results of acceptance tests and control.

Acceptance of hexagonal slabs in terms of concrete tensile strength in bending is carried out according to the results of acceptance tests, and rectangular and trapezoidal slabs - according to the results of periodic tests at least once a month.

3.3. Acceptance control of concrete strength should be carried out in accordance with GOST 18105-86.

3.4. Acceptance of plates for frost resistance, water resistance and water absorption of concrete should be carried out according to the results of periodic tests.

3.5. In cases where it is found during the verification that the tempering strength of the concrete of the slabs does not meet the requirements given in clause 2.6, the delivery of the slabs to the consumer should not be carried out until the concrete of the slabs reaches a strength corresponding to the concrete compressive strength class.

3.6. When accepting plates in terms of the accuracy of geometric parameters, the thickness of the protective layer of concrete to the reinforcement and the quality of the surfaces, controlled by measurements, selective single-stage control should be used.

4. Methods of control and testing

4.1. Testing of plates for strength and crack resistance.

4.1.1. Testing of plates for strength and crack resistance should be carried out by loading in accordance with GOST 8829-85, taking into account the requirements of this standard.

4.1.2. Load testing of the slabs is carried out after the concrete slabs have reached a strength corresponding to the concrete class in terms of compressive strength and the grade in terms of tensile strength in bending.

It is allowed to use for testing slabs that have shells, local sags and holes in concrete, the dimensions of which exceed those allowed by this standard (clause 2.9.1) by no more than two times, and other defects that do not affect the strength of the slabs.

4.1.3. Testing of plates for strength and crack resistance should be carried out according to the scheme shown in Fig. 9 and the data in Table 4

4.1.4. The values ​​of the control load when testing plates for strength and crack resistance are taken in accordance with GOST 21924.1-84 and GOST 21924.2-84.

4.1.5. The crack opening width is measured in the places of its greatest opening using a reference microscope of the MPB-2 type with a division value of 0.05 mm and a set of probes according to GOST 882-75.

4.2. The compressive and tensile strength of concrete in bending should be determined in accordance with GOST 10180-78 on a series of samples made from concrete mix of the working composition and stored under conditions in accordance with GOST 18105-86.

It is allowed to determine the actual strength of concrete slabs using the ultrasonic method according to GOST 17624-86 or mechanical action devices according to GOST 22690.0-77 - GOST 22690.4-77, as well as other methods provided for by the standards for concrete testing methods.

4.3. The frost resistance of concrete should be determined from a series of samples made from a concrete mixture of the working composition, according to GOST 10060-86. In this case, concrete specimens must be saturated with a 5% sodium chloride solution before testing and must be thawed in the same solution after each freezing cycle.

Slab test scheme

Table 4

Plate size
P60.38, P60.35
P60.30, P60.19
P60.18, PB60.18
P18.18, P18.15
ПШ13, ПШД13, ПШП13
ПШ12, ПШД12, ПШП12

4.4. The water resistance of concrete should be determined in accordance with GOST 12730.0-78 and GOST 12730.5-84 on a series of samples made from concrete mix of the working composition.

4.7. The volume of entrained air in the concrete mix should be determined according to GOST 10181.0-81 and GOST 10181.3-81.

By Decree of the Gosstroy of the Russian Federation of December 14, 2000 N 127, the effect of the above GOSTs was canceled on the territory of the Russian Federation from July 1, 2001.

See GOST 10181-2000, approved by the above resolution

4.8. Control and testing of welded reinforcing products should be carried out in accordance with GOST 10922-75.

4.9. The measurement of stresses in prestressed reinforcement, controlled after the end of tension, should be carried out in accordance with GOST 22362-77.

4.10. Methods of control and testing of raw materials used for the manufacture of boards must comply with established state standards or specifications for these materials.

4.11. Dimensions, deviations from straightness, non-flatness, thickness of the protective layer, position of the assembly and butt elements, the quality of concrete surfaces and the appearance of the slabs should be checked by the methods established by GOST 13015-75.

5. Marking, storage and transportation

5.1. Marking of plates - in accordance with GOST 13015.2-81.

Markings and signs should be applied on the side or end faces of each plate.

5.2. The requirement for a document on the quality of plates supplied to the consumer is in accordance with GOST 13015.3-81.

In addition to the main actual indicators of quality, the document should additionally provide:

concrete grades for frost resistance;

brand of concrete for water resistance;

water absorption of concrete.

5.3. Slabs must be stored and transported in the working (horizontal) position.

5.4. Plates should be stored in the warehouses of consignors and consignees in stacks sorted by brands and lots.

The height of the stack should be no more than 2.0 m.

5.5. The bottom row of slabs in a stack should be laid on a dense, carefully leveled base on pads located at the places where the slabs are lifted.

The thickness of the pads should be at least 100 mm for a soil foundation, and at least 50 mm for a rigid foundation.

5.6. When stored in a stack, as well as during transportation, the slabs must be laid on transverse spacers with a thickness of at least 25 mm, located strictly vertically one above the other at the places where the slabs are lifted.

At the same time, it should be possible to capture each slab by a crane and freely lift it for loading onto vehicles and installation.

5.7. Loading, transportation and unloading of plates must be carried out in compliance with measures that exclude the possibility of damage to the plates.

Not allowed:

unloading of plates by dropping;

capture of plates by lifting technological loops during loading, unloading and installation.

5.8. The height of the stack of plates during transportation is set depending on the carrying capacity of the vehicles and the allowable dimensions.

5.9. The boards should be transported by road or rail in the working position (face up) with a secure fastening that prevents the boards from moving.

Plates during transportation should not be subjected to shocks and shocks.

5.10. Loading, fastening and transportation of plates on open railway rolling stock (gondola cars and platforms) should be carried out in accordance with the requirements of the Rules for the Transportation of Goods and the Specifications for Loading and Fastening Goods approved by the Ministry of Railways.

5.11. When loading, transporting, unloading and storing plates, the requirements of SNiP III-4-80 should be observed.

GOST 21924.0-84

INTERSTATE STANDARDS

REINFORCED CONCRETE PLATES FOR COVERINGS OF CITY ROADS

IPK STANDARDS PUBLISHING HOUSE

INTERSTATE STANDARD

Introduction date 01.01.85

This standard applies to reinforced concrete prestressed slabs and slabs with non-tensioned reinforcement, made of heavy concrete and intended for the installation of assembly pavements for permanent and temporary city roads under the vehicle load H-30 and H-10.

The slabs are used for roads in areas with an estimated outdoor temperature (the average coldest five-day period of the construction area according to SNiP 2.01.01) up to minus 40 ° C inclusive.

When using plates in the IVA climatic subregion, additional requirements of SNiP 2.03.01 for structures intended for operation in this region should be taken into account.

It is allowed to use these plates for roads in areas with an estimated outdoor air temperature below minus 40 ° C, subject to the requirements of SNiP 2.03.01 for structures intended for operation in these conditions.

The standard does not apply to reinforced concrete slabs for internal roads of industrial enterprises, for on-farm roads according to SNiP 2.05.07, as well as to reusable slabs for temporary roads at construction sites.

1. TYPES, MAIN PARAMETERS AND DIMENSIONS

Table 1

	Dimensions, plates, mm									Slab mass (reference), t
			Plate thickness h (h1)		l1	l2	b1	b2 (b3)	a6
			prestressed	with non-tensioned reinforcement		l2 / l3

Note. The weight of the slabs is given for concrete with an average density of 2500 kg/m3.

table 2

		h	h/2	a	b	With	R

(Revised edition, Rev. No. 1).

Plates for temporary roads are made without mounting brackets Sk1.

It is allowed not to arrange niches for mounting brackets in these plates.

By agreement with the consumer, it is allowed to manufacture plates of types P and PT with grooves for loopless installation in accordance with drawing. or with holes for collets instead of mounting loops and niches for them. At the same time, in prestressed slabs for permanent roads, instead of mounting loops, it is necessary to install Sk1 brackets in accordance with Fig. (node ​​1). The number of holes for collets and their location is determined based on the technology of manufacturing plates and their installation.

The working surface of the slabs (the upper surface of the road surface) must be corrugated according to drawing. , and the plates produced by this surface "up" should be rough (p.).

Notes:

1. It is allowed to manufacture plates with a chamfer of no more than 10 mm on the front surface of the plate.

2. It is allowed to manufacture plates with technological bevels in the places of installation of mounting loops and brackets no more than 5 mm, as well as with technological niches under Sk1 brackets with a depth of 20 mm.

3. Inventory slabs for temporary roads are allowed to be manufactured with technological bevels no more than 8 mm.

4. It is allowed to manufacture plates with a general view on the existing equipment, different from that indicated in the drawing. - , while maintaining the overall dimensions of the plate and complying with all other requirements established by this standard.

5. For hingeless slabs (Fig.), changes in the shape of the slabs associated with the technology of their manufacture (the presence and size of chamfers, curvature radii, etc.) are allowed.

6. For slabs with non-stressed reinforcement, mounting loops may be vertical.

7. It is allowed to shift the mounting loops within the niches from the middle of the slab along its edge to the position of the mirror-replaced hinge bindings (dimensions a and b) damn. .

Plates with non-stressed reinforcement - in GOST 21924.2.

1.5. Plates are made with mounting loops and holes for collets (Fig. -) or grooves for loopless mounting (Fig.).

The hinges should not protrude beyond the working surface of the edge of the slab.

For lifting and installation of loopless plates, special gripping devices or collet grippers should be used, the design of which is accepted by the manufacturer in agreement with the consumer and Gosgortekhnadzor.

The slab brand consists of alphanumeric groups separated by a hyphen. The first group contains the plate type designation (p.) and its nominal dimensions in decimeters (with values ​​rounded to the nearest whole number):

For rectangular slabs - length and width;

For trapezoidal plates - length;

For hexagonal slabs - diagonal.

In the second group, the value of the load for which the plate is designed is given (p.).

For prestressed slabs in the second group of grades, a class of prestressed reinforcing steel is also given.

The brand of plates manufactured with grooves for loopless mounting or with holes for collets (instead of mounting loops) is supplemented with the letter B.

An example of a symbol (brand) of a slab for permanent roads (type 1), rectangular, 6000 mm long and 1750 mm wide, designed for a car weighing 30 tons, with prestressing reinforcement made of reinforcing steel of class A - V:

1 P60.18-30AV

The same, trapezoidal, 5500 mm long, designed for a car weighing 30 tons, with prestressing reinforcement from reinforcing steel of class A - IV:

1 PT55-30AV

The same, hexagonal with a side of 1160 mm, designed for a car weighing 30 tons, with non-tensioned reinforcement:

1 ПШ12-30

The same, slabs for temporary roads (type 2), rectangular, 3000 mm long and 1750 mm wide, designed for a car weighing 10 tons, with non-stressed reinforcement:

2 P30.18-10

1.5, 1.6. (Revised edition, Rev. No. 1).

2. TECHNICAL REQUIREMENTS

2.2. Plates are subject to manufacture in forms that ensure compliance with the requirements established by this standard for the quality and accuracy of the manufacture of plates.

2.3. Boards shall be factory prepared in accordance with the requirements of this standard.

According to the indicators of the actual strength of concrete (at the design age, vacation and transfer age);

To the quality of materials used for the preparation of concrete;

To the quality of reinforcing and embedded products and their position in the slab;

By grades of reinforcing steel;

By steel grades for embedded products and mounting loops;

According to the deviation of the thickness of the protective layer of concrete to the reinforcement.

(Revised edition, Rev. No. 1).

Concrete must meet the requirements of GOST 26633.

(Revised edition, Rev. No. 1).

Thermomechanically and thermally hardened reinforcing steel of classes At - V, At - IV, At - IVC and At - IIIC - GOST 10884;

Reinforcing wire class Вр-I - GOST 6727.

(Revised edition, Rev. No. 1).

2.8. Requirements for the accuracy of plate manufacturing

2.8.1. The values ​​of actual deviations of geometric parameters should not exceed the limit values ​​indicated in Table. .

Table 3

3.4. Acceptance of plates for frost resistance, water resistance and water absorption of concrete should be carried out according to the results of periodic tests. 3.1 - 3.4. (Revised edition, Rev. No. 1). 3.5. In cases where it is found during the inspection that the tempering strength of the concrete of the slabs does not meet the requirements given in clause , the delivery of the slabs to the consumer should not be carried out until the concrete of the slabs reaches a strength corresponding to the concrete compressive strength class. 3.6. When accepting plates in terms of the accuracy of geometric parameters, the thickness of the protective layer of concrete to the reinforcement and the quality of the surfaces, controlled by measurements, selective single-stage control should be used. 4. CONTROL AND TEST METHODS 4.1. Testing of plates for strength and crack resistance Slab test scheme Table 4 l P60.38, P60.35, P60.30, P60.19, P60.18, PB60.18 P18.18, P18.15 ПШ13, ПШД13, ПШП13 ПШ12, ПШД12, ПШП12 4.1.5. The crack opening width is measured in the places of its greatest opening using a reading microscope of the MPB-2 type with a division value of 0.05 mm and a set of probes according to NTD. It is allowed to determine the actual strength of concrete slabs using the ultrasonic method according to GOST 17624 or mechanical action devices according to GOST 22690, as well as other methods provided for by the standards for concrete testing methods. 4.10. Methods of control and testing of raw materials used for the manufacture of boards must comply with established state standards or specifications for these materials. 11. Dimensions, deviations from straightness and flatness, the thickness of the protective layer, the position of the assembly and butt elements, the quality of concrete surfaces and the appearance of the slabs should be checked by the methods established

Road slabs, reinforced concrete, GOST 21924.0-84

This standard applies to reinforced concrete prestressed slabs and slabs with non-tensioned reinforcement, made of heavy concrete and intended for the installation of assembly pavements for permanent and temporary city roads for vehicle loads H-30 and H-10.

The plates are designed for the passage of vehicles weighing 30 and 10 tons. At the same time, the dynamism coefficient is taken equal to 1.2, and the modulus of deformation of the base when calculating the slabs is: for permanent roads - 50 MPa (500 kgf / cm²); for temporary roads - 25 MPa (250 kgf / cm²).

The slabs are used for roads in areas with an estimated outdoor air temperature (the average coldest five-day period of the construction area according to SNiP 2.01.01) up to and including -40°C. It is allowed to use these plates for roads in areas with an estimated outdoor air temperature below -40 ° C, subject to the requirements of SNiP 2.03.01 for structures intended for operation in these conditions.

The standard does not apply to reinforced concrete slabs for internal roads of industrial enterprises, for on-farm roads according to SNiP 2.05.07, as well as to reusable slabs for temporary roads at construction sites.

Plates are divided into types depending on:

from destination:

• for permanent roads
• for temporary roads;

from configuration:

• P - rectangular,
• PB - rectangular with one combined side,
• PBB - rectangular with two combined sides,
• PT - trapezoidal,
• PSh - hexagonal,
• ПШД - hexagonal axial diagonal,
• ПШП - hexagonal axial transverse,
• DPSh - diagonal half of a hexagonal plate,
• PPSh - the transverse half of a hexagonal plate.

For the preparation of concrete, Portland cement should be used in accordance with GOST 10178 with additional requirements for concrete pavements.
It is allowed to use Portland cement according to TU 21-20-51-83.
Aggregates - in accordance with GOST 26633 (grain size of coarse aggregate is not more than 20 mm).

Concrete grades for frost resistance and water resistance for slabs intended for permanent roads in areas with an average monthly design temperature of the coldest month (according to SNiP 2.01.01): up to -5 ° C - F 100 and W 2; below -5°C to -15°C - F 150 and W 4; below -15 ° C - F 200 and W 4. Concrete grades for frost resistance and water resistance for slabs intended for temporary roads in areas with an average monthly design temperature of the coldest month: up to -5 ° C - F 75 and W 2; below -5°C to -15°C - F 100 and W 2; below -15°C - F 150 and W 2.

As prestressed reinforcement of prestressed slabs, rod thermomechanically hardened reinforcing steel of classes At-V, At-IV and At-IVC and hot-rolled classes A-V and At-IV should be used. Non-weldable reinforcing steel of classes At-V and At-IV should be used in the form of whole rods of a fixed length without welded joints.

As non-tensioned reinforcement, reinforcing wire of class Vr-1 and bar reinforcing steel of classes At-IIIC, A-III and A-I should be used.

Plates must meet the requirements of GOST 13015.0:

According to the indicators of the actual strength of concrete (at the design age, vacation and transfer age);

To the quality of materials used for the preparation of concrete;

To the quality of reinforcing and embedded products and their position in the slab;

By grades of reinforcing steel;

By steel grades for embedded products and mounting loops;

According to the deviation of the thickness of the protective layer of concrete to the reinforcement.