Research On Asphalt Mixture Functional Layer For Cement Concrete Pavement

Cement concrete pavement is an important road structure form of high-grade pavement with long service life, low maintenance workload, less energy consumption, simple construction, as well as strong adaptability to traffic grade and environment. However, due to various reasons, our country's early cement concrete pavement life significantly lower than design life, early disease such as fracture and disengaging are widespread. In order to extend concrete pavement service life, The dissertation mainly studyed setting asphalt mixture functional layer for Cement concrete pavement. The study palys important theoretical significance to reduce early damage,improve concrete pavement performance and build a conservation-minded society.The dissertation based on the concrete pavement interlayer effect mechanism and transition layer theory, analyzes common failure types of cement concrete pavement, according to stiffness coordination problems between base and surface course of rigid base cement concrete pavement and the base erosion problems of semi-rigid base cement concrete pavement,then point out the necessity of setting functional layer between base and surface course of cement concrete pavement. Based on laboratory test, test device is developed to test accumulated deformation of the functional layer mixture. Preferred common mixture AC-16, AC-13, AC-10, analyze the influencing factors of cumulative deformation of mixtures as well as the increasing law. According to specimen volume deformation analysis of pre and post of the test,we can make a conclusion that more important reason of deformation is shear push,rather than pressure consolidation.Based on the test results that the cumulative deformation of the functional layer is less than 3.5mm, will not affect the flatness of the concrete panels. In addition, lab shear test and water stability test are carried out to prove their excellent performance.And based on indoor shear test and water stability test, the dissertation puts forward cement concrete pavement functional layer asphalt mixture design method.