Tenability evaluation of road pavement with internal cracks

Abstract

The article is a completed stage in the study of the multilayer road pavement with internal cracks tenability. The work tested the hypothesis adequacy about internal cracks’ effect on the pavement strength. The authors reviewed and analyzed the bench testing methods of road pavement. A program has been developed for testing two-layer asphalt concrete pavement samples in the presence and absence of an imitation crack in the lower pavement layer. Pavement test cylinders were made in the laboratory and tested for uniaxial compression and shear, and test beam for tension in bending, under various temperature conditions, simulating the operating pavement conditions on highways. In general, the test results confirm the proposed hypothesis adequacy and do not contradict the generally accepted asphalt concrete strength theory. Also, were executed mathematical modeling and stress-strain state evaluation of multilayer road pavement with internal cracks in the lower pavement layer. The mathematical model showed significant changes in the stress-strain state of samples with internal cracks, which correlates with the laboratory tests results. Based on the obtained results, a sample model reinforced with geosynthetic materials was developed and tested in the laboratory and mathematically. The fractured geogrid-reinforced sample showed higher tensile strength parameters in bending. In conclusion, recommendations are given to improve the crack resistance at the stage of repair work.