pavement base
7.The causation of main defects is analyzed from the view of design and improvements are suggested from the structural design, such as the test and determination of basic data of pavement design, rational selection of raw materials, adopting appropriate aggregate sizes, improving blend design method, rational selecting the thickness of asphalt layer and reinforcing the binding between the asphalt pavement layer and the base layer to further improve the operational function of the asphalt pavement and reduce the occurrence of traffic accidents.
10.Lastly, with the fatigue equation, the paper establishes the fatigue stress coefficient which is used in the load stress calculation for lean concrete as undersurface of cement concrete pavement, and the structure coefficient of flexural tensile strength which is used in the flexural stress check for lean concrete as base of asphalt pavement.

