动水冲刷作用下季冻区沥青混合料水损害发展的细观过程

doi:10.11896/cldb.21040158

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Abstract The dynamic water scouring is one of the most important factors causing water damage of asphalt mixture. In this work, the air void of the ordinary AC asphalt mixture, mixtures with cement, hydrated lime and polymer anti stripping agent were measured under the combined action of dynamic water scouring and freeze-thaw (DWS-FT) cycle by a self-made simulation equipment. Meanwhile, the evolution of meso pore structure in the process of water damage of asphalt mixture was analyzed with the CT scanning test combined. The test results show that with the increase of DWS-FT cycle times, more frost heaving holes were found in the mixture. Combined with the loss of fine materials under the action of dynamic water. The frost heaving effect is intensified and holes are gradually connected which may aggravate the scouring effect of dynamic water in reverse. The effect of DWS-FT became stronger and the range of pore penetration was wider for the parts with more agglomerated pores and the edge area of specimens. The 3D pore model data show that the bulk porosity of the mixture has a decreasing trend from the upper to the bottom. For the mixture with cement and slaked lime, the porosity increase rate of the upper layer is close to that of the middle layers, indicating that the depth of the DWS-FT cycle is the largest. The porosity increase rate of the pore of the asphalt mixture with polymer is the smallest. With the traditional freeze-thaw test compared, the splitting tensile strength of the mixture decreases more significantly under the DWS-FT cycle mode, and the decay trend of mechanical strength is basically consistent with the change law of macro and micro pore structure. The comprehensive data show that the asphalt mixture with polymer anti stripping agent has the best performance and water stability after cycling, followed by the mixture with hydrated lime and cement.

Key words： asphalt mixtures dynamic water scour freeze-thaw cycle void rate pore structure

Published: Online: 2022-05-24

CLC number:

U414

Fund:National Natural Science Foundation of China (51868047) and the Gansu Natural Science Foundation (20JR10RA171).

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	Articles by authors
	WANG Ying
	YANG Xi
	JIANG Jibin
	LI Ping
	NIAN Tengfei

Cite this article:

WANG Ying,YANG Xi,JIANG Jibin, et al. The Micro Process of Water Damage in Asphalt Mixture in Seasonal Frozen Area Under the Dynamic Water Erosion[J]. Materials Reports, 2022, 36(10): 21040158-7.

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http://www.mater-rep.com/EN/10.11896/cldb.21040158 OR http://www.mater-rep.com/EN/Y2022/V36/I10/21040158

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