Research On Application Of Cemeni Concrete Pavement Slabs Empty Of Polyurethane Foam Void Treatment

With the development of materials science,many new materials gradually been applied in road engineering, and new materials have become a major force in the path of development. Polyurethane foam have the feature of high expansion, early strength, waterproof, environmental protection, so you can completely cut off the infiltration of water, mud pump and solve Slabs empty disease. In this paper, polyurethane foam, and combine GPR techniques, analysis of polymer grouting material and grouting Treatment Slabs empty feasibility.Firstly, Slabs of empty traditional approach by Beckman Beam Deflection tests to determine Slabs empty location, then the void at the injection grout, grout although extensive source material, inexpensive, but its resistance to water damage weak, poor mobility, high temperature sensitivity, leading to this method in dealing Slabs of empty areas is not obvious. Polyurethane foam is injected into Slabs of empty positions, the rapid expansion of the volume of material and cured, thereby filling the void, strengthening grassroots loose, lift pavement. Coupled with the dip radar NDT techniques, and gradually form a highly efficient, fast, safe and environmentally friendly maintenance methods.Secondly, the board at the end to form a void main reason is squirt mud diseases, rain along the road into the grass roots seams, loose grass roots mixed with fine material in the vehicle under repeated loads, a negative vacuum pressure, fines are table with a way out, the bottom plate gradually void, if not Treatment, will continue to increase.Finally, relying on substantial projects conducted a field test grouting. The results showed that the polyurethane grouting method can eliminate the wrong station, after grouting smooth pavement has greatly improved; secondly, grouting point deflection value overall decreasing trend, and the bottom of the front panel grouting serious Void greatly reduce the magnitude of the deflection position; and finally, radar test results show grouting pavement structure can be discharged in the water, treatment grassroots loose. Therefore, the use of polyurethane grouting method to deal with minor dislocation is feasible in road maintenance practice.