[1] Chen Jun, Zhao Cheng, Yin Xiaojing,. Experimental study on expansion and contraction of unsaturatedporous asphalt mixture exposed to freeze-thaw cycles [J]. Journal of Southeast University (English Edition), 2022, 38 (1): 9-14. [doi:10.3969/j.issn.1003-7985.2022.01.002]

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Experimental study on expansion and contraction of unsaturatedporous asphalt mixture exposed to freeze-thaw cycles()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

38

Issue:

2022 1

Page:

9-14

Research Field:

Traffic and Transportation Engineering

Publishing date:

2022-03-20

Info

Title:

Experimental study on expansion and contraction of unsaturatedporous asphalt mixture exposed to freeze-thaw cycles

Author(s):

Chen Jun¹;  Zhao Cheng¹;  Yin Xiaojing²

¹ College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China
² China Municipal Engineering Central South Design and Research Institute Ltd., Co., Wuhan 430010, China

Keywords:

open-graded friction course(OGFC);  freeze-thaw(FT);  saturation degree(SD);  volume change;  anti-raveling

PACS:

U414

DOI:

10.3969/j.issn.1003-7985.2022.01.002

Abstract:

The expansion and contraction of an open-graded friction course(OGFC)with a nominal maximum aggregate size of 13.2 mm(OGFC-13)with three air void contents(AVCs)and six saturation degrees(SDs)exposed to freeze-thaw(FT)cycles were measured using strain gauges. Cantabro tests were conducted on OGFC-13 specimens before and after FT cycles to evaluate the degradation of raveling resistance. The effects of SD, AVC, and the number of FT cycles on the expansion and contraction of OGFC-13 and degradation of raveling resistance were analyzed. Results show that OGFC with low water saturation will contract to stability during the freezing process, whereas fully saturated OGFC will contract first and then expand to be stable. OGFC with a medium saturation experienced three stages, namely, contraction, expansion, and contraction, during the freezing process. For the OGFC with a low SD, the decrease in the void content can effectively reduce the low temperature shrinkage. By contrast, for the OGFC with a high SD, lower void content produces more temperature shrinkage at the beginning of freezing and less expansion at the end of freezing. The decreases in SD and AVC can effectively improve the raveling resistance of OGFCs exposed to FT cycles.

References:

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Memo

Memo:

Biography: Chen Jun(1981—), male, doctor, associate professor, chen_jun2728@163.com.
Foundation items: The National Natural Science Foundation of China(No. 52178421), the Natural Science Foundation of Jiangsu Province(No. BK20191300), the Fundamental Research Funds for the Central Universities(No. B210202036).
Citation: Chen Jun, Zhao Cheng, Yin Xiaojing.Experimental study on expansion and contraction of unsaturated porous asphalt mixture exposed to freeze-thaw cycles[J].Journal of Southeast University(English Edition), 2022, 38(1):9-14.DOI:10.3969/j.issn.1003-7985.2022.01.002.

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