Abstract
Semi-flexible pavement has been widely used in China's road construction due to its excellent rutting resistance. Due to the large difference in volume stability between the matrix asphalt mixture and the cement mortar, the internal stress of the semi-flexible pavement material is concentrated and cracking is likely to occur. To explore the influence of different Influencing factors on the cracking resistance of semi-flexible pavement materials. This paper used the orthogonal design method to design the mix ratio of ordinary cement mortar. On this basis, admixtures (silica fume, ordinary emulsified asphalt, water-based epoxy resin) were added to prepare special cement mortar. Then, using cement mortar type, matrix porosity, matrix asphalt type, matrix aggregate type as the influencing factors, this article has studied his influence on the crack resistance of semi-flexible pavement materials. Tests show that cement mortar type, matrix porosity, matrix asphalt type, matrix aggregate type have varying degrees of influence on the crack resistance of semi-flexible pavement. The effect of matrix porosity on low temperature crack resistance is the greatest, followed by asphalt and cement mortar types, and the lowest by aggregate type. Enhancing the flexibility of cement mortar and enhancing the elastoplasticity of the matrix are conducive to improving the low-temperature performance of semi-flexible pavements.
Highlights
Semi-flexible pavement is a new type of pavement structure formed by pouring the high-performance cement mortar into the pavement structure with large voids
The influence of chemical shrinkage reducer and water reducers of various functions on the performance of cement mortar was discussed by Cai Anlan[9].Hu Shuguang[10] analyzed the influential factors of the volume stability and crack resistance of semi-flexible pavement, and develop polymer cement mortar with strong fluidity and small shrinkage deformation
Based on the internal stress control method, the internal cracking mechanism of semi-flexible pavement materials was explored by Wang Duanyi and so on[13]
Summary
Semi-flexible pavement is a new type of pavement structure formed by pouring the high-performance cement mortar into the pavement structure with large voids. The influence of chemical shrinkage reducer and water reducers of various functions on the performance of cement mortar was discussed by Cai Anlan[9].Hu Shuguang[10] analyzed the influential factors of the volume stability and crack resistance of semi-flexible pavement, and develop polymer cement mortar with strong fluidity and small shrinkage deformation. This paper first obtains the mix ratio of ordinary cement mortar based on orthogonal experiments, and selects silica fume, emulsified asphalt, and water-based epoxy resin as cement mortar admixtures from the perspective of engineering application, and optimizes the performance of cement mortar, prepare three kinds of special cement mortars, and makes analysis on the anti-cracking performance of semi-flexible pavement with the cement mortar type, the matrix void ratio, the matrix aggregate type, the matrix asphalt type as influential factors, providing operability technical reference for the optimization of crack resistance of semi-flexible pavement
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