Cement pavement repair method you right?

Seam joints are weak parts of cement concrete pavement slabs, and they are also the key to pavement maintenance. Sealing materials are generally replaced in about 3-5 years, so as to avoid gaps in the joints after aging of the jointing materials, thus mud, sand, Intrusion of debris and other debris into the plate expansion obstacles, intrusion of hard objects will cause plate edge cracking, and rain and snow water can penetrate along this gap, damage the base layer and cushion to form holes, resulting in deformation of the plate Such damage. Next Xiaobian introduced cement pavement repair methods.

1. Injection grouting method

a, due to the hydration of cement, concrete cutting joints are not timely and inadequate roadbed strength, uneven and many other reasons, will cause road panel block, cross-cross cracks, cracked plate corners, cracked network, cracks and other cracks damage.

b. For non-extensible surface cracks with a width of 0.5 mm or less, a pressure injection grouting method may be used.

Use air compressor to remove debris inside the joint, press a grouting nozzle every 50 cm, seal the seam with tape, and seal the rosin wax on the grout nozzle and tape (Rosin: paraffin = 1:2 ratio heating and melting ) Finally press the epoxy solution into the seam. If the condition is not available or the crack damage is light, it can also be sealed directly with joint fillers.

2, expansion joint grouting method

When local cracks and wide slits, expansion joint grouting method can be adopted.

The slits are first widened to 1.5cm square grooves along the crack. The depth of the groove is determined by the depth of the crack, but the maximum depth must not exceed 2/3 of the board thickness. Blow out the swarf with air compressor, apply interface agent or epoxy solution, fill in 0.5 cm in diameter cleaning chips, and apply 15:2 polysulfide modified epoxy and curing agent. Grooves, with far-infrared lamp heating to enhance 2-3 hours to traffic.

3, direct grouting method

For non-extensive cracks, direct grouting can be used. First remove the impurities in the seams, seams, mud, etc., and blow the net with air compressor to ensure that the joints are dry and free of water. Apply a layer of polyurethane primer to the seams at a thickness of 0.3Â±0.1. Cm, the amount of primer is 0.15, and the component A composed of polypropylene glycol, toluene diisocyanate, plasticizer, white carbon, filler and the like is used. The B component consists of a catalyst, a curing agent, and an anti-sagging agent. When used, press A:B=10;1 to prepare the ratio. A, B liquid should not be exposed to the air for a long time to prevent self-polymerization. Then the prepared polyurethane adhesive is poured into the seam and cured after 4-6 hours.

4, strip cover method

For full-thickness cracked cracks, stripping should be used to repair. First, along the two sides of the crack about 20cm, and parallel to the contraction slit 7-10cm deep two transverse joints, in which artificially cut 7-10cm, 10cm along both sides of the crack, every 50cm drilling a pair of palladium 20cm long bending Hook length 7cm, Â¢16 rebar, coated with interface agent or epoxy resin solution in the hole, and then cast fast hardening ç ¼, spraying curing agent. Deepen the shrinkage joint with a slitting machine, fill the sewing material, and finally, repair the blind ditch at the end of the crack to facilitate drainage.

5, surface cracking treatment

For more surface cracks and surface cracks, the crack can be classified as a construction surface, the cracks in the construction surface can be chiseled into a 7-10cm groove and blown with a compressor, and then coated with an interfacial agent or epoxy. Resin solution, filled with T-6 latex mortar (according to cement: sand: stone: J-6: water = 1:1.6:3.25:0.019:0.35: slump of 1-2cm), spraying curing agent, 4 hours It will be open to traffic.

Editor's summary: The cement pavement repair method was introduced here and I hope it will help everyone. If you want to know more related information, you can pay attention to this website information.

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