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With asphalt mastic mixture (SMA) the black pavement surface , can improve the rut resistance of asphalt mixtures high temperature , low temperature crack resistance , fatigue resistance , water stability , road performance , road durability is significantly improved . The large number of documents we can see the SMA mix for the new highway pavement surface , rare for the renovation and expansion project , how to the SMA mix well for Overlay Engineering is main contents of this article . Wide - Shao Expressway expansion project background , starting from the practical application of engineering survey of the existing pavement damaged condition , and the causes of road damaged condition analysis , discusses the calculation method of the overlay thickness . Laboratory test with Target Proportioning and mixing plant , a large number of tests , and ultimately come to the production mix , and for construction . The deflection theory using calculated using software HMPD draw leveling layer and the overlay thickness and SMA mixture Research and mechanism . For the SMA Mixture of production and construction process , the main process of its raw materials , mixing , transportation , paving , RCC target control , in order to guide the construction . Layer thickness the proposed SMA overlay design method as well as given in , mixing ratio , mixture control temperature in Canton - Shao Expressway expansion project to be a part of the application .
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