Investigation of the strength of multilayer pavements with internal cracks

Abstract

In the work, the adequacy of the hypothesis about the influence of internal cracks on the strength of the coating was tested. The authors reviewed and analyzed the methods of bench testing of road surfaces. A program has been developed for testing samples of a two-layer asphalt concrete pavement in the presence and absence of an imitation crack in the lower pavement layer. Samples-cylinders of the coating were made in the laboratory and tested for uniaxial compression and shear, and samples-squirrels in tensile bending, under various temperature conditions, simulating the conditions of operation of the coating on highways. The test results, in general, confirm the adequacy of the hypothesis put forward and do not contradict the generally accepted theory of asphalt concrete strength. Based on the results obtained, a model of a sample reinforced with geosynthetic materials has been developed. The sample with a fractured geogrid showed higher tensile flexural strength parameters. In conclusion, recommendations are given for increasing the crack resistance of the road surface at the stage of repair work.