Effect of Salt Concentration on CR-WMA Cracking Characteristics under Freeze-Thaw Cycles

Abstract

Abstract: In order to scientifically analyze the effect of deicing salt erosion on the cracking characteristics of warm rubber powder modified asphalt mixture (CR-WMA) and hot rubber powder modified asphalt mixture (CR-HMA) under the action of freeze-thaw cycles, application of digital image (DIC) technique for three-point bending test repeated loading levels of the two semi-circular pieces under the test strain generated analysis were used for quantitative description damage cracking of asphalt mixture. The semicircular bending tensile test (SCB) was used to analyze the creep strain energy (DCSE) of the two specimens, and the correlation analysis with the damage and cracking index based on DIC technology was carried out. The test results show that the point with a larger value in the horizontal strain field is closely related to the evolution of damage and cracking of the specimen. The damage and cracking resistance of CR-WMA and CR-HMA first decreases and then increases with the increase of salt concentration at worst concentration of 8%. Whether it is frozen or salt water freezing conditions, D_E value and the value CR-WMA D_CSE relatively high CR-HMA, described CR-WMA cracking resistance and were superior erosion salt CR-HMA: it is found that D_E and D_CSE have a good correlation, which verifies the rationality of the DIC technology to evaluate the cracking characteristics of asphalt mixtures.

Key words: freeze-thaw cycle, salt erosion, digital image technology, warm rubber powder modified asphalt mixture, damage cracking

CLC Number:

U414

FENG Lei, CHEN Zheng, WANG Lan, LUO Xin. Effect of Salt Concentration on CR-WMA Cracking Characteristics under Freeze-Thaw Cycles[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(5): 1743-1750.

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