Analysis of Low Temperature Performance of Warm Mix Crumb Rubber Powder Modified Asphalt and Its Adhesion to Aggregate

Abstract

Abstract: Through bending beam rheological (BBR) test, contact angle measurement and atomic force microscope (AFM) test, the low temperature crack resistance of warm mix crumb rubber powder modified asphalt (WCR) before and after aging and its adhesion change law to aggregate were studied from macroscopic and microscopic perspectives, and hot mix crumb rubber powder modified asphalt (HCR) was used as a comparison. The results show that with the increase of aging degree, the ratio of creep rate (m) to bending creep stiffness (S) (m/S) of HCR and WCR decreases, and the low temperature crack resistance becomes worse. The low temperature crack resistance and aging resistance of WCR are better than HCR. The adhesion of HCR, WCR to three kinds of aggregates before and after aging is limestone > basalt > granite, and the adhesion of WCR to aggregates is better than that of HCR. The micro Derjaguin-Muller-Toporov (DMT) modulus of the two asphalts before and after aging has a good linear relationship with the low temperature rheological parameter (m/S), and the micro surface energy and adhesion work obtained based on Johnson-Kendall-Roberts (JKR) mechanical model has a strong correlation with the macro surface energy and adhesion work obtained based on the surface energy theory.

Key words: warm mix crumb rubber powder modified asphalt, macro and micro method, long-term and short-term aging, low temperature crack resistance, surface energy, adhesion

CLC Number:

U414

CHEN Baiyinshuang, WANG Lan, ZHANG Qi, ZHOU Xiaodong, LUO Xuedong. Analysis of Low Temperature Performance of Warm Mix Crumb Rubber Powder Modified Asphalt and Its Adhesion to Aggregate[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(2): 704-714.

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