Study On The Structure Of Asphalt Overlay On Reconstruction Of Old Pavement

With the increase of old pavement reconstruction, it is more and more important to analyze the structure of asphalt overlay simply and effectively.Now the study on the design criteria of asphalt overlay is still at the groping phase and has not been an integrated system at home and abroad . Basing on the previous results, the production of the structure analysis and the design criteria on reconstruction of old pavement and new pavement is referenced. The typical structures of asphalt overlay and their features are analyzed systemly and in-depthly. Traditional manner of dividing old pavement reconstruction with asphalt pavement and concrete pavement is broken and the new system and relevant design indices is built.For the structure of non-slabs underlayer, the compression Strain of asphalt overlay bottom and top surface tension strain of non-slabs are used for design indices. In allusion to the typical feature and influencing factor of structure of asphalt underlayer, the classical elastic layer system theory was used to analyse the compression Strain of asphalt overlay bottom and top surface tension strain of underlayer, and the design indices are tested. At the same time the influencing analysis on the load and temperature stress is used for the design principle of structure of deck under asphalt layer. For the structure of concrete slab or rigid base under asphalt layer, the finite element analysis is used and the feature of old concrete slab modulus, thickness of new asphalt layer and load are considered. The load and temperature stress of concrete slab after constructing asphalt overlay are computed. The influencing modulus picture of load stress from asphalt layer is acquired.