Damage Characteristics of Foamed Asphalt Mixture Modified by Silane Coupling Agent Under Freeze-thaw Cycles
DAI Wenting1, LIU Dandan2, GUO Wei2, LI Yingsong3, AN Yin2
1 College of Construction Engineering, Jilin University, Changchun 130026, China 2 College of Transportation, Jilin University, Changchun 130022, China 3 College of Transportation, Southeast University, Nanjing 211102, China
Abstract: In this paper, the design optimization of foam asphalt and the road performance of foam asphalt mixture after freeze-thaw cycles were studied. Using the self-designed asphalt foaming machine, combined with the optimal foaming conditions,the foaming temperature was 159 ℃ and the stirring rate was 1 156 r/ min, of 70# base asphalt, the influence of foaming water consumption on foaming effect was studied, and four kinds of asphalt mixtures were prepared by modifying asphalt with silane coupling agent. The results showed that the penetration degree of foam asphalt increased with the increase of foaming water consumption, and the softening point, ductility and viscosity decreased with the increase of water consumption. When the freeze-thaw cycle is 30 times, compared with the none modified mixture, the high-temperature stability, low-temperature crack resistance and water stability of the foam asphalt modified by silane coupling agent increased by 20.63%, 28.51% and 20.14%. The modified asphalt foam had high temperature performance, low temperature crack resistance and the water stability is relatively stable. The adhesion strength of modified asphalt foams with silane coupling agent has been enhanced, and the problem of the decrease of cohesive force caused by water inside the foamed asphalt has been improved.
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2021, Vol. 35 
