Analysis of Rheological Properties and Micromechanism of Foamed Warm Mix Asphalt Mastic
WEN Yankai1, GUO Naisheng1, WANG Lin1, GU Wei2, YOU Zhanping3
1 Transportation Engineering College, Dalian Maritime University, Dalian 116026, China 2 Department of Road and Bridge Engineering, Liaoning Provincial College of Communications, Shenyang 110122, China 3 Department of Civil and Environmental Engineering, Michigan Technological University, Houghton 499312, USA
Abstract: The objective of this study is to explore the rheological properties of foamed warm mix asphalt (foamed asphalt) mastic with different filler-binder ratios completely, by using the dynamic shear rheometer (DSR) with temperature and frequency sweep, and bending beam rheometer (BBR) tests, respectively. Also, the influence of filler-asphalt ratio on the high and low temperature performance of the foamed asphalt mastic was analyzed, and the effectiveness of time-temperature superposition principle was discussed for the foamed asphalt mastic by the vGP graph. The master curve of foamed asphalt mastic was established, and then the master curve was used to perform a rheological analysis in a wide temperature and frequency domain. In addition, this study investigated the micromechanism of the foamed asphalt mastic by using direct microstructure observations and thermal property testing, including scanning electron microscope (SEM) and differential scanning calorimeter (DSC). The results show that the addition of mineral filler exhibits a significant influence on the high and low temperature performance of the foamed asphalt. Then, with the increase of filler-binder ratio, the high temperature performance of the foamed asphalt mastic increases, and the low temperature performance decreases. The time-temperature superposition principle can be employed in the foamed asphalt mastic investigated. The foamed asphalt mastic shows high temperature performance better than the base asphalt mastic in a wide temperature and frequency domain. The low temperature grading temperature of the foamed asphalt mastic exhibits a favorable consistency with that of the base asphalt mastic in this study. The distribution of filler in the base asphalt mastic is inferior to that in the foamed asphalt mastic. The base asphalt mastic with larger amount of micro-hole is found compared with foamed asphalt mastic. The foamed asphalt indicates a thermal stability lower than base asphalt, however, the thermal stability of foamed asphalt mastic displays an obvious increase as compare to that of base asphalt mastic. The foamed asphalt mastic performs glass transition temperature higher than the base asphalt mastic when the filler-binder ratio is less than 1.0. The filler-binder ratio in the foamed asphalt mastic is proposed to be less than 1.0 through the rheological properties and micromechanism investigation.
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2020, Vol. 34 
