description, technical characteristics - Rosatomsnab. Aerodrome plates pag. description, technical characteristics - rosatomsnab Aerodrome road plates PAG - design

GOST 25912.0-91

Group G33

STATE STANDARD OF THE UNION OF THE SSR

REINFORCED CONCRETE PRESTRESSED PAG PLATES FOR AERODROME PAVEMENTS

Specifications

Reinforced concrete prestressed slabs PAG for aerodrome pavement. Specifications

Introduction date 1992-01-01

INFORMATION DATA

1. DESIGNED

Ministry of Defense of the USSR

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

USSR Ministry of Transport Construction

DEVELOPERS

B.I. Demin, Ph.D. tech. sciences (topic leader); K.D. Zhukov; V.A. Dolinchenko, Ph.D. tech. sciences; V.E. Anisimov, Ph.D. tech. sciences; N.B.Vasiliev, Ph.D. tech. sciences; V.A. Kulchitsky, Ph.D. tech. sciences; V.V. Vakhrushev; S.L. Nerubenko, Ph.D. tech. sciences; L.B. Pchelkina; N.I. Shkinin; A.A. Galchenko; I.A. Vavilov; G.I. Berdichevsky, Doctor of Engineering sciences; N.A.Markarov, Doctor of Engineering sciences; V.Ya.Yakushin, Ph.D. tech. sciences; A.M. Sheinin, Ph.D. tech. sciences; E.R. Pinus, Ph.D. tech. sciences; V.M. Skubko; V.I. Denshchikov

INTRODUCED by the Ministry of Defense of the USSR

2. APPROVED AND INTRODUCED BY Decree of the State Construction Committee of the USSR dated 12.03.91 N 8

3. REPLACE GOST 25912.0-83

4. REFERENCE REGULATIONS AND TECHNICAL DOCUMENTS

This standard applies to prestressed reinforced concrete PAG slabs, 6 x 2 m, made of heavy concrete and intended for the installation of prefabricated airfield pavements.

1. TECHNICAL REQUIREMENTS

1. TECHNICAL REQUIREMENTS

1.1. Plates are manufactured in accordance with the requirements of this standard and duly approved technological documentation containing requirements for the manufacture of plates at all stages of the production process, according to the drawings given in GOST 25912.1 - GOST 25912.3.

1.2. 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.

1.3. Main parameters and dimensions

1.3.1. Depending on the thickness of the plate, they are divided into PAG-14, PAG-18 and PAG-20.

1.3.2. The shape and main dimensions of the plates must correspond to those indicated in Fig. 1-4.

Notes:

1. On the longitudinal edges of the slabs, recesses with dimensions of 20x100x200 mm are allowed to provide the possibility of lifting the slabs using automatic grippers.

2. In slabs with inclined longitudinal edges, assembly-butt products M1 or M3 (Fig. 1 and 3) are installed flush with the plane that determines the overall size of the slab width - 2000 mm.

Damn.1. Plate PAG-14; Plates PAG-18 and PAG-20

Plate PAG-14

Plates PAG-18 and PAG-20

Damn.2. Options for the profile of the longitudinal edges of the slab (section 6-6)

Options for the profile of the longitudinal edges of the slab (section.6-6 )

Plate thickness

Damn.3. Mounting and butt products M1 or M3

In parentheses is the size for the PAG-14 plate

1 - assembly-butt product M1 or M3; - plate thickness

Damn.4. The shape and main dimensions of the plates

1 - butt product M2 or M4; 2 - butt product M4a

1.3.3. By agreement with the consumer, it is allowed to manufacture plates with a profile of longitudinal edges that differ from those shown in Fig. 2 (sec. 6-6 ), with dimensions of openings for assembly-butt products that differ from those shown in Figures 1 and 3, and with assembly-butt products of a different design, provided that the operational properties of the airfield pavement are ensured.

In PAG-18 slabs, the distance from the end of the slab to the assembly-and-butt products, in agreement with the consumer, is allowed to be less than 1500 mm.

1.3.4. Plates are made with a working surface (upper surface of the airfield pavement) "up". It is allowed, in agreement with the consumer, to manufacture plates with a working surface "down".

The working surface of the boards produced with this "up" surface must be rough. The surface roughness is obtained by processing this surface with nylon brushes or tarpaulin tape (after compacting the concrete mixture).

The working surface of the plates produced with this "down" surface must be corrugated. The corrugation of the surface is formed by using the form of a steel sheet with rhombic corrugation as the bottom of the pallet in accordance with GOST 8568. The sheet on the pallet is positioned so that the large diagonal of the rhombus is perpendicular to the longitudinal axis of the plate (Fig. 5).

Heck. 5. Sheet arrangement on the pallet

1 - corrugation of the working surface of the plate

The depth of the corrugation must be at least 1.5 mm. By agreement with the consumer, it is allowed to produce plates with a corrugation depth of 1.2 mm.

1.3.5. Reinforcement of slabs is produced by:

in the longitudinal direction - prestressing reinforcement;

in the transverse direction - non-stressed reinforcement.

1.3.6. As prestressed reinforcement of plates, bar reinforcing steel of classes At-V, A-V, At-IV, At-IVC and A-IV is used. Prestressing reinforcement should be used in the form of whole rods without joints.

Non-stressed fittings - from rod reinforcing steel of classes A-III, At-IIIC, A-II and reinforcing wire of class Vr-1.

1.3.7. The design of the plates is given:

PAG-14 - in GOST 25912.1;

PAG-18 - in GOST 25912.2;

PAG-20 - in GOST 25912.3.

1.3.8. Plates are designated by marks consisting of alphanumeric groups separated by a hyphen.

The first group contains the abbreviated letter name of the plate - PAG (aerodrome smooth plate).

In the second group, the thickness of the plate in centimeters and the characteristics of the prestressed longitudinal reinforcement are given:

IV - for reinforcing steel of classes At-IV, At-IVC and A-IV;

V - for reinforcing steel of classes At-V and A-V.

In the designation of the brand of PAG-14 plates with prestressed longitudinal reinforcement with a diameter of 12 mm (GOST 25912.1), the number 1 is additionally given (through a hyphen).

Examples of plate symbols:

18 cm thick with prestressed longitudinal reinforcement class At-V:

PAG-18U,

14 cm thick with prestressing reinforcement class At-IVC with a diameter of 12 mm:

PAG-14IV-1.

1.4. concrete requirements

1.4.1. Slabs should be made of heavy concrete of medium density over 2200 to 2500 kg/m inclusive, meeting the requirements of GOST 26633*.
________________
GOST 26633-2012

1.4.2. The actual strength of concrete must correspond to the required one, assigned in accordance with GOST 18105 *, depending on the normalized strength of concrete (class for tensile strength in bending and class for compressive strength, transfer and temper strength) and on the characteristics of the actual uniformity of concrete strength.
_________________
* The document is not valid on the territory of the Russian Federation. Valid GOST 18105-2010

1.4.3. The slabs shall be made of concrete of flexural tensile strength class 3.6 and compressive strength class B25. In this case, the actual compressive strength of concrete (clause 1.4.2) should not be lower than 29.4 MPa (300 kgf/cm).

1.4.4. The normalized transfer strength of concrete is 70% of the concrete class in terms of compressive strength.

1.4.5. The value of the normalized tempering strength of concrete is taken equal to the value of the normalized transfer strength and not lower than 70% of the concrete class in terms of tensile strength in bending.

The supply of slabs with a concrete tempering strength lower than the strength corresponding to its tensile strength class in bending and compressive strength class is carried out on the condition that the manufacturer guarantees that the concrete structure will achieve the required strength, determined by the results of testing control samples made from the concrete mixture of the working composition, stored under conditions in accordance with GOST 18105 and tested at the age of 28 days (GOST 13015.0 *).
________________
* The document is not valid on the territory of the Russian Federation. GOST 13015-2012 is valid. - Database manufacturer's note.

1.4.6. The frost resistance of the concrete of the slabs must correspond to the established design documentation of a particular structure or the frost resistance grade of concrete specified in the order of the slabs.

The frost resistance grade of concrete is accepted for slabs intended for use in areas with an estimated average monthly air temperature of the coldest month (according to SNiP 2.01.01 *) not lower than:
________________
* The document is not valid on the territory of the Russian Federation. SNiP 23-01-99 are in force. - Database manufacturer's note.

1.4.7. The concrete mixture used for the manufacture of slabs must have a water-cement ratio of not more than 0.5.

In the compacted concrete mixture, the volume of entrained air (when using air-entraining additives) should be within 5-6%.

1.4.8. To regulate and improve the properties of the concrete mix and concrete in the manufacture of slabs, plasticizing and air-entraining (gas-forming) chemical additives should be used in accordance with GOST 24211 *.
________________
* The document is not valid on the territory of the Russian Federation. GOST 24211-2008 is valid. - Database manufacturer's note.

1.4.9. The quality of the materials used for the preparation of concrete must ensure that the technical requirements established by this standard for concrete slabs are met.

1.4.10. Portland cement according to GOST 10178, intended for concrete of airfield pavements, should be used as a binder.

1.4.11. Coarse and fine aggregates - according to GOST 10268 * (grain size of coarse aggregate - no more than 20 mm).
________________
* The document is not valid on the territory of the Russian Federation. GOST 26633-2012 is valid. - Database manufacturer's note.

The use of gravel as a coarse aggregate is allowed upon agreement with the consumer with an appropriate feasibility study.

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

Water - according to GOST 23732 *.
________________
* The document is not valid on the territory of the Russian Federation. GOST 23732-2011 is valid. - Database manufacturer's note.

1.5. Requirements for reinforcing and assembly-butt products

1.5.1. The shape and dimensions of reinforcing and assembly-butt products must comply with those given in GOST 25912.4.

1.5.2. Welded reinforcing and assembly-butt products must meet the requirements of GOST 10922 *.
________________
* The document is not valid on the territory of the Russian Federation. GOST 10922-2012 is in force, hereinafter in the text. - Database manufacturer's note.

1.5.3. Grades of reinforcing steel of classes A-III, A-II and A-I, as well as grades of ordinary quality carbon steel used for the manufacture of joint products, must correspond to the grades established by the design documentation of a particular structure or specified when ordering plates.

1.5.4. Reinforcing steel must meet the requirements:

bar reinforcing steel of classes:

At-V, At-IVC, At-IV and At-IIIC - GOST 10884*;
________________
* The document is not valid on the territory of the Russian Federation. GOST 10884-94 is valid. - Database manufacturer's note.

A-V, A-IV, A-III, A-II and A-I - GOST 5781;

reinforcing wire class Vr-1 - GOST 6727.

1.6. Tension of prestressing reinforcement

1.6.1. The tension of the prestressed longitudinal reinforcement of the slab should be carried out mechanically or electrothermally.

1.6.2. The heating temperature of the prestressed reinforcement with the electrothermal method of tensioning it should not exceed 450 °C.

1.6.3. Stress values ​​in prestressed reinforcement, controlled after its tension on stops, for reinforcing steel of classes:

At-V and A-V - 590 MPa (6000 kgf/cm);

At-IV, At-IVC and A-IV - 530 MPa (5400 kgf/cm).

Deviations of stress values ​​in prestressed reinforcement should not exceed ±10%.

1.7. The materials used to lubricate the molds must not have a harmful effect on the concrete.

Form lubricant should be applied in a thin layer evenly over the entire surface of the mold tray, with the removal of excess lubricant formed in some places.

1.8. The laying of the concrete mixture into the mold during the manufacture of slabs with the working surface "down" (clause 1.3.4) is carried out at a temperature difference between the mold tray and the concrete mixture of not more than 20 ° C.

The working surface of the slabs made by this surface "up" leveled after compaction of the concrete mixture is treated with nylon brushes or canvas tape, cleaned of hardened cement mortar. Before heat-moisture treatment of boards, the said surface should be covered with burlap, polyethylene film, bituminized paper or other similar materials.

1.9. The mode of heat treatment of plates must comply with the established technological documentation in accordance with the instructions of SNiP 3.09.01.

The temperature of isothermal heating should not exceed 70 °C.

The relative humidity of the environment during the period of isothermal heating of plates in pit-type chambers must be at least 98%; in tunnel-type chambers - not less than 96%.

1.10. The transfer of the compression force to the concrete (tension release of the prestressing reinforcement) should be carried out after the concrete of the slab reaches the required transfer strength (clause 1.4.2).

1.11. Requirements for the accuracy of plate manufacturing

1.11.1. The actual deviations of the geometric parameters of the plates should not exceed the limit specified in Table. one.

Table 1

In plates of the highest quality category, the actual deviations in the dimensions of the plates in millimeters should not exceed:

along the length ±5;

thickness +3;

from the flatness of the working surface 4.

1.11.2. The actual deviations of the thickness of the protective layer of concrete to the reinforcement from its nominal value specified in the drawings should not exceed ± 3 mm.

1.11.3. The ends of the prestressing reinforcement should not protrude beyond the end surfaces of the plates by more than 5 mm.

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

1.12.1. The working surface of the plates (clause 1.3.4) must not have cracks.

Shrinkage and technological cracks with a width of more than 0.05 mm and a length of more than 50 mm are not allowed on the non-working surface and side faces of the plates.

The corrugated surface of the plate should have a clear corrugation pattern without groove edges.

1.12.2. Peeling of concrete is not allowed on the working surface of the slabs.

1.12.3. The dimensions of shells, local sags and depressions on the concrete surface and around the concrete of the ribs of the slabs should not exceed the values ​​\u200b\u200bspecified in Table 2.

table 2

1.12.4. Correction of defects on the working surface and sealing around the edges of the slabs is not allowed.

1.12.5. The side edges at the bottom and top surfaces of the slabs, as well as the open surfaces of the assembly-and-butt products, must be cleared of concrete sagging.

1.13. Marking

1.13.1. Plate marking must comply with the requirements of GOST 13015.2 * and this standard.
________________
* The document is not valid on the territory of the Russian Federation. GOST 13015-2012 is valid. - Database manufacturer's note.

1.13.2. Marking inscriptions are applied on the side longitudinal edge of the plate.

Markings must contain:

plate brand (clause 1.3.8);

trademark or short name of the manufacturer;

technical control stamp;

date of manufacture of the board.

1.13.3. On the longitudinal edges of the slab at a distance of 1 m from its end, a mounting mark "Bearing point" is applied.

1.13.4. On the working surface of the slab, the mark of the manufacturer must be applied, the designation and method of application of which is agreed with the customer and indicated in the contract for the supply of slabs.

2. ACCEPTANCE

2.1. Acceptance of plates is carried out in batches in accordance with the requirements of GOST 13015.1 * and this standard.
________________
* The document is not valid on the territory of the Russian Federation. GOST 13015-2012 is in force, hereinafter in the text. - Database manufacturer's note.

The batch includes plates of the same type, manufactured by the enterprise using the same technology from materials of the same type and quality within no more than one day.

The batch size should not exceed 200 pcs.

2.2. Plates are accepted according to the results:

acceptance tests - in terms of concrete strength (classes of tensile strength in bending and compressive strength, transfer and tempering strength), water-cement ratio of the concrete mixture, compliance of reinforcing and assembly-butt products, thickness of the protective layer of concrete to reinforcement, accuracy of geometric parameters , surface quality and appearance of the slabs, according to the crack resistance of the lower and upper zones of the slab;

periodic tests - in terms of frost resistance of concrete, in terms of the volume of air involved in the compacted concrete mixture.

2.3. A batch of slabs in terms of their strength and stiffness is accepted if the requirements established by this standard for a set of normalized and design indicators characterizing the strength of concrete, slab thickness, diameter and location of reinforcement, thickness of the concrete protective layer before reinforcement, the main parameters of reinforcing and assembly-butt products , tension of prestressing reinforcement, physical and mechanical properties of reinforcing steel, which are checked during the input, operational and acceptance control in accordance with GOST 13015.1.

2.4. Acceptance control of concrete strength (based on test results of concrete samples or non-destructive methods) is carried out in accordance with GOST 18105.

The determination of the tensile strength of concrete in bending, as well as the compressive strength of concrete at the design age (clause 1.4.3) is carried out only on the basis of samples.

2.4.1. To control the transfer and tempering strength of concrete in compression by non-destructive methods, three slabs are selected from the batch.

Concrete strength control is carried out in five sections of any surface of the slab - one in the middle of the slab and in each corner at a distance of 30-40 cm from its top along the bisector.

2.4.2. In cases where it is established during the control that the tempering surface of the concrete of the slabs does not meet the requirements specified in clause 1.4.5, the supply of such slabs to the consumer should be carried out only after the concrete slabs have reached a strength corresponding to the classes of tensile strength in bending and strength for compression (clause 1.4.3).

2.5. Periodic tests in terms of frost resistance of concrete slabs, as well as in terms of the volume of air involved in the compacted concrete mixture, are carried out at least once every 6 months, as well as when changing the manufacturing technology of slabs, changing the starting materials and the composition of the concrete mixture used to prepare concrete.

2.6. The control of the water-cement ratio in the concrete mixture is carried out for each batch of concrete slabs.

2.7. Acceptance of reinforcing and assembly-butt products is carried out before they are installed in a mold in accordance with GOST 10922 and GOST 23858.

2.8. Acceptance of plates in terms of the accuracy of geometric parameters, the thickness of the protective layer of concrete to the reinforcement, the quality of the surface, controlled by measurements, should be carried out based on the results of selective single-stage control.

Acceptance of slabs by the presence of assembly-and-butt products, by cleaning their open surfaces and ribs of slabs from concrete influxes, by the presence of peeling of concrete and grease spots on the working surface of the slab, by the correct application of markings and signs, is carried out according to the results of continuous control.

2.9. When accepting plates in terms of crack resistance of their lower and upper zones, one plate is selected for testing from each batch of plates, which satisfies the requirements of this standard in other respects.

It is allowed to use for testing a slab that has shells, local sags and gaps in concrete, the dimensions of which exceed those allowed by this standard (clause 1.12.3) by no more than two times, and other defects that do not affect the strength of the slabs.

The slab is considered to have passed the test if, under the control load specified in clause 3.8.4, no cracks are found on the surface of the test zone and side faces upon careful examination through a magnifying glass with a fourfold increase.

In case of unsatisfactory results of the crack resistance test for at least one zone, an additional test of two plates of this batch is carried out. If at least one of the two boards does not pass the test, then all boards of this batch are subjected to the test.

By agreement with the consumer, it is allowed to test the plates for crack resistance not from each batch, but from a larger number of plates and at other times depending on the volume of their production, but at least once a month.

2.10. Based on the results of acceptance, a document is drawn up on the quality of the supplied plates in accordance with GOST 13015.3 *.
________________
* The document is not valid on the territory of the Russian Federation. GOST 13015-2012 is valid. - Database manufacturer's note.

In addition, the quality document should include:

brand of concrete for frost resistance;

class of reinforcing steel used as longitudinal prestressing reinforcement (At-V, A-V, At-IVC, At-IV, A-IV);

grades of reinforcing steel of classes A-I - A-III and grades of carbon steel of ordinary quality, from which assembly and butt products of plates are made.

3. CONTROL METHODS

3.1. The strength of concrete during its control by samples is determined according to GOST 10180 * on a series of samples made from a concrete mixture of the working composition and stored under conditions in accordance with GOST 18105.
________________
* The document is not valid on the territory of the Russian Federation. GOST 10180-2012 is valid. - Database manufacturer's note.

Determination of the actual transfer and tempering strength of concrete in compression during their control by non-destructive methods in slabs (clause 2.4) is carried out by the ultrasonic method according to GOST 17624 *, mechanical action devices or the separation method with chipping according to GOST 22690 *.
________________
* The document is not valid on the territory of the Russian Federation. GOST 10181-2000 is valid. - Database manufacturer's note.

3.4. Control methods for reinforcing and assembly-butt products - according to GOST 10922 and GOST 23858.

3.5. Methods for controlling raw materials used for the manufacture of boards must comply with established standards or specifications for these materials.

3.6. Measurement of controlled stress in prestressed longitudinal reinforcement - according to GOST 22362.

3.7. Dimensions, deviations from the straightness of the profile, from the flatness of the slab, from the perpendicularity of adjacent faces, the thickness of the concrete protective layer to the reinforcement, the position of the joint products, as well as the quality of the concrete surfaces and the appearance of the slabs are checked by the methods established by GOST 26433.0 and GOST 26433.1.

3.8. Control of crack resistance of plates

3.8.1. Testing of plates for crack resistance of the lower zone should be carried out according to scheme A, shown in Fig. 6. The test of plates for crack resistance of the upper zone is carried out according to scheme A or B, shown in Fig.6.

Heck. 6. Scheme A, according to which the plates are tested for crack resistance of the lower zone; Scheme B, according to which the plates are tested for crack resistance of the upper zone

1 - test plate; - wooden bars with a section of 10x10 cm; 4 - loading ballast

Note. Dimensions in parentheses refer to the test schemes for PAG-18 and PAG-20 boards.

3.8.2. Testing of plates after heat treatment (with concrete tempering strength) should be carried out no earlier than 4 hours and no later than 2 days.

3.8.3. First, the plate is tested for crack resistance of the lower zone, and then the same plate is tested for crack resistance of the upper zone. When testing the plate for crack resistance of the upper zone according to scheme A, shown in Figure 6, the plate is turned over after testing the lower zone.

The loading of the plate during the test is carried out in steps. The share of the load of each stage should be no more than 10% of the control load, and the last two steps - no more than 5%.

After applying each stage of the control load, the slab is kept under load for at least 10 minutes, and after applying the full control load - for at least 30 minutes.

3.8.4. The values ​​of the control load for testing the crack resistance of the plate are given in Table 3.

Table 3

4. TRANSPORT AND STORAGE

4.1. Transportation and storage of plates should be carried out in accordance with the requirements of GOST 13015.4 * and this standard.
________________
* The document is not valid on the territory of the Russian Federation. GOST 13015-2012 is valid. - Database manufacturer's note.

4.2. The boards should be transported and stored in a horizontal position.

4.3. The height of the stack of plates during their transportation is set depending on the carrying capacity of the vehicles and the permissible loading dimensions, but not more than the height of the stack of plates during their storage (clause 4.8).

4.4. Loading of plates and their fastening during transportation on open railway rolling stock (gondola cars, 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 USSR Ministry of Railways.
________________
*Probably an original error. It should read: "Technical Conditions for Loading and Securing Cargoes". - Database manufacturer's note.

The approximate consumption of wire with a diameter of 6 mm for fixing plates on a train is 1.2 kg per 1 m of transported plates.

Transport marking - in accordance with GOST 14192 *.
________________
* The document is not valid on the territory of the Russian Federation. GOST 14192-96 is valid. - Database manufacturer's note.

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

The slabs should be transported with reliable fastening on vehicles, excluding longitudinal and transverse displacement of the slabs, as well as their mutual collision and friction during transportation.

4.6. During transportation and storage, the bottom plates should be supported on wooden pads, and spacers should be placed between the plates along the height of the stack. Linings and gaskets should be placed at a distance of 1 m from the end of the slab, perpendicular to its long side and vertically one above the other.

The thickness of wooden linings with a rigid base must be at least 50 mm, and with a soil base - at least 100 mm. The thickness of the gaskets is at least 20 mm.

4.7. Loading and unloading operations with gripping for assembly and butt products should be carried out one plate at a time. It is forbidden to lift two or more slabs with a grip on the assembly-butt products of the lower slab.

When using special rigging devices that work without gripping the assembly-and-butt products, the number of plates in the lifted package should not exceed three.

4.8. Plates should be stored in warehouses in stacks sorted by brands and lots.

In a stack, it is allowed to stack no more than 10 slabs in height.

Electronic text of the document
prepared by Kodeks JSC and verified against:
official publication
Reinforced concrete slabs for
airfield pavements: Collection.
GOST 25912.0-91 - GOST 25912.4-91. -
M.: Publishing house of standards, 1991