The Application Studying Of Asphalt Overlay In Reforming Of The Old Cement Concrete Pavement

With sharply increasing of the volumes of the traffic and the loading capacity of the cars in recent years, the road's construction breaking is gradually becoming sharply. More and more diseases have coming out with different degrees in old cement concrete pavements, and urgently need strength handling. Therefore urgently the original old cement concrete roads need to be proceeded thoroughly reforming. For making use of the old cement concrete pavements and saving investment, one of the validity measures o improve the function of the roads is adopting the overlay of asphalt concrete. Because the disease harming influence in the segment from the K553 to K558 of Nanning-Liuzhou freeway of Guangxi area was serious, it needs completely to be reformed now. This paper is mostly analyzed on the early disease harming of the cement concrete pavements, and brings up a designing project to improve the old cement concrete pavement by adding an asphalt concrete overlay on it, and spreads a testing segment to validate the argument.The overlay of asphalt concrete on the cement concrete road is a special pavement construction, and the stress-diversification has biggish difference from normally flexibility samdwich system. Because of the existing cracks, the asphalt concrete overlay is placed in a complicated three-dimension stress state while under the outside loading. Based on the researching of the original cement concrete pavements'condition and through the analysis of different types of the disease, it brings up different punishing methods and designing projects for the overlay. From the choice of the original material and matching ration design of the mixtures to the disease handling and construction quality controlling, all proceeded detailed researching and analysis. While adopting the void filling method to design the material's matching ratio of the SMA-13 and KH-13 dense-broken grading wearing layer, it's coming out that: the KH-13 dense-broken grading wearing layer can completely attain the usage result compared to SMA-13 when adopting that method to design the KH-13. When adopting the void filling method to design the mixtures'matching ratio, it can consumedly reducing the trying work, and guaranteeing its having good synthesizing road function and surface function, and ameliorating the antinomy between the surface anti-slippery function and close-grained enduring of the bitumen mixtures.