ABSTRACT
There is an increasing requirement of using porous asphalt as overlay of old pavement in maintenance engineering. It is important to study the mechanical property of the road structure with porous asphalt overlay. In this research, old road surface in different conditions are taken into account, including: pavement with different rutting depth and hot in-place recycled surface. Continuous loading measurements and rotary loaded wheel tests were performed on the core samples and cores paved with porous overlay. Finite element method was employed to simulate deformation of the road structure. It shows that the bearing capacity and rutting resistance are improved by adding the porous asphalt layer in general. The milled thickness of the original road surface layer also influences performance of the whole structure. This research can help engineers to make road structural design by using porous asphalt overlay in pavement maintenance and reconstruction.
