Research on Adaptability of Semi-rigid Material as Base Course for Long-life Asphalt Pavement

Abstract

In the light of semi-rigid material as base course for perpetual asphalt pavement, the bearing capacity and fatigue life of asphalt pavement with semi-rigid base cause and different asphalt layer’s thickness were computed with BISAR3.0 after chosen typical pavement. The impact of thickened layer on the stress of the semi-rigid base, the dry shrinkage and temperature shrinkages of the material were analyzed, and its adaptability as base for perpetual pavement was studied. The result shows that (1) under the same load, with thickening of the asphalt layer, the compressive stress on the top and the tensile stress at the bottom of the semi-rigid base decrease obviously and the fatigue life of the base increases substantially; (2) the impact of temperature and humidity on the semi-rigid base is remarkably weakened, which leads to the fractures, erosion and reflecting cracks of the semi-rigid base to be controlled effectively.