Research On Material Composition Analysis And Application Of Graded Crushed Aggregate Of Urban Main Roads

The semi-rigid base asphalt pavement is applicated widely in this time, but following the deeper research of the structure, the weakness of this pavement is realized by researcher gradually. The vast survey data show that the reflection crack is the main problem of the semi-rigid base asphalt pavement, also it is the major reason of the disease in the early stage of the asphalt pavement in highway. For the satisfactory performance in drainage and reflection crack elimination of the graded crushed aggregate base asphalt pavement, and following the deeper realization of this pavement, it will be an important structure in the diversified development of highway pavement in our country. Based on the above mentioned, this dissertation researched the performance and application of the graded broken stone.Firstly, the dissertation research the basic performance of graded crushed aggregate and it's influence factor, analyse the technical data of the material used in graded crushed aggregate, research the different mechanical properties in different graduation by using different molding methods to confirm the influence factor of graduation and advance that the best graduation should be made up in the consideration of maximum size of aggregate by prioritized use shaking molding method. Then, research the influence of all grades of coarse aggregate to the percentage of voids in aggregate by using uniform design method, and confirm the best graduation by verifying use the Bailey Method.Secondly, the dissertation research on the design methods and analysis of the mechanical properties of graded crushed aggregate asphalt pavement, and raise the suitable design method in our country's reality by comparing the methods in other countries. Then, the dissertation analyse the influence of modulus and depth of graded crushed aggregate to compressive strain in the top surface of subgrade and pavement deflection.At last, the dissertation advances that the quality control in the construction should use the mechanical properties checking and general degree of compaction checking considering the pavement structure, graduation design and construction process, also the rational construction manual. The constructed test road solved the problem of construction process in hot and sticky South China and provided the support to development of the flexible base asphalt pavement.