冻融循环作用对非饱和乳化沥青冷再生混合料性能的影响

doi:10.13229/j.cnki.jdxbgxb20210303

摘要/Abstract

摘要：

针对季冻区乳化沥青冷再生混合料路面服役实际情况设计了冻融循环试验，通过宏观性能试验，测定非饱和乳化沥青冷再生混合料空隙率、冻融劈裂强度比、低温劈裂强度和高温抗剪强度随冻融循环次数的衰减规律。借助扫描电子显微镜（SEM），观察不同冻融循环次数下非饱和混合料的微观形貌变化。基于对宏观性能衰变规律与微观损伤情况的分析，探索了非饱和乳化沥青冷再生混合料的冻融损伤机理。经过20次冻融循环后，非饱和乳化沥青冷再生混合料空隙率增加1.06%，劈裂强度比下降26.3%，高、低温性能均产生大幅度损伤。混合料结构内部乳化沥青-水泥砂浆界面的水泥水化产物受冻融循环作用由外至内发生破坏，沥青胶浆剥落，沥青与集料粘附性降低，集料间的空间架构逐步受损，最终导致非饱和乳化沥青冷再生混合料性能损伤。

关键词: 道路工程, 乳化沥青冷再生混合料, 非饱和, 冻融循环, 宏观性能, 微观损伤

Abstract:

According to the actual of emulsified asphalt cold recycled mixture pavement in seasonal frozen area， the freeze-thaw cycle test is designed to explore the performance decay law of the unsaturated emulsified asphalt cold recycled mixture under freeze-thaw cycles. Through the emulsified asphalt cold recycled mixture with different number of unsaturated freeze-thaw cycle， emulsified asphalt cold recycled mixture of ultrasonic wave velocity， void fraction， freeze-thaw splitting strength， low temperature splitting strength and high temperature shear strength were determined， emulsified asphalt cold recycled mixture macro performance changes are analyzed. The micro morphology of the mixture under different times of unsaturated freeze-thawing cycle is observed by Scanning Electron Microscope （SEM）. The results showed that after 20 cycles of unsaturated freeze-thaw， the void ratio of the emulsified asphalt cold-recycled mixture increased by 1.06%， the ultrasonic wave speed decreased and the splitting strength decreased by 26.3%. Both high temperature performance and low temperature performance are greatly damaged. The cement hydration products at the interface between emulsified asphalt and cement mortar in the mixture structure are damaged from the outside to the inside by freeze-thaw cycles， the asphalt mortar peels off， the adhesion between asphalt and aggregate decreases， and the space structure between aggregates is gradually damaged， which eventually leads to the performance damage of unsaturated emulsified asphalt cold recycled mixture.

Key words: road engineering, emulsified asphalt cold recycled mixture, unsaturated, freeze-thaw cycle, macro performance, micro damage

中图分类号:

U416

杨彦海,崔宏,杨野,张怀志,刘赫. 冻融循环作用对非饱和乳化沥青冷再生混合料性能的影响[J]. 吉林大学学报(工学版), 2022, 52(10): 2352-2359.

Yan-hai YANG,Hong CUI,Ye YANG,Huai-zhi ZHANG,He LIU. Effect of freeze-thaw cycle on performance of unsaturated emulsified asphalt cold recycled mixture[J]. Journal of Jilin University(Engineering and Technology Edition), 2022, 52(10): 2352-2359.

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