The Evaluation And Study Of Technology For Repaving And Renewal Of Existing Cement Concrete Pavements

In recent years, quite a few of existing cement concrete pavements of our country have already been close to or exceeded anticipated service life. Some pavements don't reach anticipated service life, but they have been damaged in various degree or their use quality has dropped because the volume of traffic increases severely, automobile axle weighing becomes heavy-duty day by day or other reasons, such as design and construction. The damage of some cement concrete pavements is very serious. That has great influenced the comfortableness of driving, made the speed difficult improved and the traffic capacity dropped.So it has very important theoretical and realistic significance for studying repaving and renewal of existing cement concrete pavements of expressway that the overall and careful evaluation and analysis to existing cement concrete pavements are carried on and the research of technology for repaving and renewal of existing pavements is made on such basis.While existing cement concrete pavements damaged seriously is repaired or reconstructed, involved questions as following. First, the state of existing cement concrete pavements is evaluated, including carrying capacity, voids, the state of joints and pavement surface of such function performance, structure performance and so on. Second, the renewal of existing pavements should satisfy the need of technology, as well as it should be economical. Third, they should make the repaying pavement satisfy the need of anti-skid, evenness and compactness, and it must have enough anticipated service life that the selection of the existing pavement repaving project and design are. Fourth, the study of technological measure for interlayer management between the old pavement and the new pavement and preventing reflection crack.They are preparatory work for pavement repaving and renewal that the damage investigation and use quality evaluation for existing cement concrete pavements are. Pavement structural analysis and evaluation are the base andprecondition of pavement repaving and renewal. It is key content of the whole renewal work that the asphalt overlay structure design of existing cement concrete pavements. And the quality control of construction of pavement repaving and renewal is the key part for a successful renewal.