High and Low Temperature Performance of Warm/Hot-Mixed Crumb Rubber Modified Asphalt Mixture under Salt Freezing-Thawing Cycles

Abstract

Abstract: Through the triaxial repeated creep test, trabecular bending test, and bending creep test, the high and low temperature performance of the warm-mixed crumb rubber modified asphalt mixture (CR-WMA) and the hot-mixed crumb rubber modified asphalt mixture (CR-HMA) under the action of salt freezing-thawing cycles were studied, and the Burgers model was used to fit and analyze the creep data. The results show that with the increase of number of times of freezing-thawing cycles, the high and low temperature performance of CR-WMA and CR-HMA gradually decreases. When the number of times of freezing-thawing cycles is 0 to 15, the high and low temperature performance reduces the speed fastest, and later the change tends to be gentle. The performance of CR-WMA reduces more slowly and less than that of CR-HMA. With the increase of salt concentration, the high and low temperature performance of CR-WMA and CR-HMA gradually decreases. When the salt concentration is 8%, the decrease amplitude reaches the maximum. The downward trend of CR-WMA is more moderate than that of CR-HMA.The change law of viscoelastic parameters fitted by creep data also verified the above conclusions, indicating that CR-WMA doped with SDYK surfactants has more stable high and low temperature performance than CR-HMA, and has better resistance to salt erosion and crack resistance.

Key words: warm/hot-mixed crumb rubber modified asphalt mixture, salt freezing-thawing cycle, high temperature performance, low temperature performance, Burgers model

CLC Number:

U414

WANG Lan, GUO Zhixiang, ZHANG Baoxin, SONG Changzhen, HE Liqi. High and Low Temperature Performance of Warm/Hot-Mixed Crumb Rubber Modified Asphalt Mixture under Salt Freezing-Thawing Cycles[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(4): 1395-1404.

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