Wang Yiqi, Tan Yiqiu, Guo Meng, Wang Xinglong
School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, China.
College of Civil and Architectural Engineering, Heilongjiang Institute of Technology, Harbin 150050, China.
Materials (Basel). 2017 May 6;10(5):504. doi: 10.3390/ma10050504.
Properties of cement-stabilized gravel modified by emulsified asphalt under freezing and thawing cycle conditions were investigated by adjusting the dosage of cement. Mercury intrusion porosimetry (MIP) and Scanning electron microscopy (SEM) were introduced to analyze the influential mechanism. The results indicate that cement emulsified asphalt stabilized gravel with 5 wt % of cement performed well in both mechanics and frost-resistance. Although the addition of emulsified asphalt would lead to a partial decrease of strength, it can extend the process of strength loss and improve the freezing resistance. The main reason for this is that the permeability can be improved by the filling effects of emulsified asphalt. The frost-heave stress caused by the phase transition of water can also be remitted by emulsified asphalt, the elasticity modulus of which is much lower than the matrix. The generating speed of the micro crack can also be slowed down by emulsified asphalt.
