Research on Crack Resistance of Semi-flexible Pavement Materials

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...

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Bibliographic Details
Published in:E3S web of conferences 2021-01, Vol.248, p.1020
Main Author: Jiahong, Wu
Format: Article
Language:English
Subjects:
Admixtures
Asphalt
Asphalt mixes
Asphalt pavements
Bituminous cements
Cement
Crack propagation
Elastoplasticity
Epoxy resins
Flexible pavements
Low temperature
Low temperature resistance
Mortars (material)
Pavement materials
Porosity
Residual stress
Resistance factors
Road construction
Silica
Silica fume
Silicon dioxide
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Summary: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.
ISSN:2267-1242
2555-0403
2267-1242
DOI:10.1051/e3sconf/202124801020