DEEP ANALYSIS ON INTERLAYER RESTRAINING REFLECTIVE CRACKS IN ASPHALT OVERLAY OLD CONCRETE PAVEMENT

摘要

It is a common technology in pavement rehabilitation to overlay old concrete slabs with asphalt mixtures. The main problem in this practice is that reflective cracks often show up easily in the asphalt overlay. It is known that the initiation or propagation of the reflective cracks can be delayed or prevented by adding an interlayer between the asphalt overlay and the old concrete pavement. With the three-dimensional finite element model and analysis, the load and thermal stresses in the asphalt overlay on old concrete pavements with cracks were studied. This paper showed a detailed study of the effects of the stress absorbing interlayer and the reinforced layer on restraining reflective cracks. Based on the principles of fracture mechanics, the stress intensity factor around cracks was discussed.