A Study Of Steel Mesh Reinforced Asphalt Overlays On Existing Concrete Pavements To Combat Reflective Cracking

The problem of reflective cracking of asphalt overlays on existing concrete pavements is a universal technical problem. To solve this problem, many researchers and technicians domestic and abroad have done a lot of theoretical analysis and experimental evaluations on mechanical mechanism of reflection cracking and measures in retarding reflective cracking. At present, the structure which is based on steel mesh reinforced in asphalt overlays on existing concrete pavements has a certain application in the projects, but the theoretical research remains to be studied. This paper starts from structural performance simulation of asphalt overlays on existing concrete pavements, establishes the plane mechanics model of asphalt overlays on existing concrete pavements, studies steel mesh which is a new material in pavements reinforcement, analyses the stress change of asphalt overlays on existing concrete pavements with or without steel mesh under traffic loads and temperature loads separately, and discusses steel mesh reinforced asphalt overlays on existing concrete pavements to combat reflective cracking.According to linear elasticity theory, this article establishes two-dimensional model of pavements structure based on plane stress and plane strain problems, Systematically analyses the best position of steel mesh in asphalt overlays and the affects on the internal force of asphalt overlays with steel mesh under traffic and temperature loads, using cross-sectional areas equivalent to form a thin steel. This article also analyses the stress changes of asphalt overlays on existing concrete pavements with or without steel mesh with foundation modulus and loads size changing under traffic loads. The conclusion showed that steel mesh could greatly improve the forces of asphalt overlays and restrain maximum tensile stress and maximum shear stress on the bottom of asphalt overlays obviously. From the perspective of combating reflective cracking, the minimum width of 2m steel mesh could achieve the effect of combating reflective cracking of asphalt overlays on existing concrete pavements. Steel mesh plays an important role in combating reflective cracking of asphalt overlays on existing concrete pavements.