Set Of Stress-absorbing Layer Of Cement Concrete Pavement Asphalt Overlay Structure

It is a simple and effective way to rehabilitate Old Cement Concrete Pavements with Asphalt Overlays. However, How to control the initiation and development of the reflective cracking in Hot Mix Asphalt (HMA) Overlay is the most important key to the application of this pavement structure. Recently, many researchers and engineers around the world have been involving in active research of reflective cracking in HMAO, but not very effective. Compared with different ways for the problem in a systematic way and considered the great difference between PCC and HMA in mechanical characteristics, the application of a new technique, Cosail, is consist of dense-graded mix, which is used as stress-absorbing interlays was to solved the problem.Combining material strength theory and using 3D finite elements model, detailed analysis of loading, thermal, coupled stress condition in joint area of overlay is given effected by stress-absorbing interlays parameters of thickness, modulus, with in-place pavement sensors, it was generalized max temperature changes. The analysis results showed the main causes of reflection cracking of AC overlay on. PCC are the vehicle loading and temperature changes. With the increase of thickness of AC, the affection is not very clear. When the stress-absorbing interlays, which is 2~3cm and low modulus was added in the pavement, the stress in pavement system was reduced obviously.By detailed analysis of the laboratory experiments, this paper studies the principle respectively how the geo-textile, glass fiber grid and interlayer stress absorbing mixture prevents and controls reflection cracking. Their advantages and shortcomings are also analyzed comparatively in this paper. And by the LLM apparatus, it is comparatively analyzed interface strength law.The design parameters, design criteria and design methods for the stress-absorbing interlays structure on PCC and ACO on cracking and seating slab are discussed. The computation method for equal resilient modulus on top of cracked slab is studied.