冻融循环-动水冲刷对间断级配沥青混合料特性参数影响

兰州理工大学学报 ›› 2022, Vol. 48 ›› Issue (4): 132-137.

冻融循环-动水冲刷对间断级配沥青混合料特性参数影响

党志荣¹, 念腾飞^*2,3, 刘宗成², 姜继斌², 杨海丽¹, 石国雄¹

1.甘肃第七建设集团股份有限公司, 甘肃兰州 730000;
2.兰州理工大学土木工程学院, 甘肃兰州 730050;
3.甘肃路桥建设集团养护科技有限责任公司, 甘肃兰州 730000

收稿日期:2021-12-01 出版日期:2022-08-28 发布日期:2022-10-09
通讯作者: 念腾飞(1989-),陕西大荔人,博士,副教授.Email:tengfeinian@lut.edu.cn
基金资助:
国家自然科学基金(51868047),甘肃省自然科学基金(20JR10RA171),甘肃省高等学校创新基金(2022A-026)

Influence of freeze-thaw cycles-dynamic water scouring cycles on the characteristic parameters of intermittently graded asphalt mixture

DANG Zhi-rong¹, NIAN Teng-fei^2,3, LIU Zong-cheng², JIANG Ji-bin² YANG Hai-li¹, SHI Guo-xiong¹

1. The NO. 7 Construction Group Share Limited Company of Gansu Province, Lanzhou 730000, China;
2. School of Civil Engineering, Lanzhou Univ. of Tech., Lanzhou 730050, China;
3. Gansu Road & Bridge Construction Group Maintenance Technology Co. Ltd.,Lanzhou 730000, China

Received:2021-12-01 Online:2022-08-28 Published:2022-10-09

摘要/Abstract

摘要： 沥青路面在水、温和荷载长期作用下服役寿命明显降低.为探寻沥青混合料路用性能衰减规律,本文自主研发了沥青混合料动水冲刷模拟试验装置,对沥青混合料马歇尔试件开展多次冻融循环-动水冲刷循环作用,分析了沥青混合料特性参数变化规律,结合CT切片扫描,探寻了沥青混合料内部结构变化规律.结果表明:在冻融循环-动水冲刷循环前期,各特性参数都呈现出较快的增长或衰减;在外加动力水压作用下,沥青混合料内部吸水量会逐渐增加至饱水状态,沥青混合料试件内部的微开口孔隙会发生结构与形态的变化;经12次冻融循环-动水冲刷循环,沥青混合料的劈裂强度降幅高达65.44%.研究结果为深入了解沥青路面水损害机理提供了理论基础.

关键词: 沥青混合料, 冻融循环, 动水冲刷, SMA-13, 特性参数

Abstract: Under the long-term action of water, temperature and load, the service life of asphalt pavement is significantly reduced. In order to explore the decay law of asphalt mixture road performance, a dynamic water scour simulation test device for asphalt mixtures was independently developed. The asphalt mix Marshall specimens were subjected to multiple freeze-thaw cycles-dynamic water scouring cycles to analyze the change law of asphalt mix characteristics parameters, combined with CT slice scanning to explore the law of internal structural changes of asphalt mixes. The results show that each characteristic parameter shows a faster growth or decay in the pre-freeze-thaw cycle-dynamic water scour cycle. Under the action of applied dynamic water pressure, the internal water absorption of asphalt mixture will gradually increase to the full water state, and the micro-open pores inside the asphalt mixture specimens will undergo structural and morphological changes. The splitting strength of the asphalt mixture was reduced by up to 65.44% after 12 freeze-thaw cycles-dynamic water scouring cycles. The research results provide a theoretical basis for further understanding of the water damage mechanism of asphalt pavements.

Key words: asphalt mixture, freeze-thaw cycles, moving water scouring, SMA-13, characteristic parameters

中图分类号:

党志荣, 念腾飞, 刘宗成, 姜继斌, 杨海丽, 石国雄. 冻融循环-动水冲刷对间断级配沥青混合料特性参数影响[J]. 兰州理工大学学报, 2022, 48(4): 132-137.

DANG Zhi-rong, NIAN Teng-fei, LIU Zong-cheng, JIANG Ji-bin YANG Hai-li, SHI Guo-xiong. Influence of freeze-thaw cycles-dynamic water scouring cycles on the characteristic parameters of intermittently graded asphalt mixture[J]. Journal of Lanzhou University of Technology, 2022, 48(4): 132-137.

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