[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(
)
非饱和多孔沥青混合料冻融变形特征的试验研究
)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
- 非饱和多孔沥青混合料冻融变形特征的试验研究
- 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
- 开级配抗滑磨耗层(OGFC); 冻融; 饱和度; 变形; 抗飞散
- 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.
- 为了研究非饱和多孔沥青混合料冻融变形特征, 采用应变片测量了3种空隙率和6种饱和度的集料最大公称粒径为13.2 mm 的OGFC-13的冻融变形, 并利用冻融循环前后肯塔堡飞散试验, 分析了饱和度、空隙率和冻融循环次数对OGFC-13抗飞散性能的影响.结果表明: 随着冻结时间的延长, 饱和度较低的OGFC体积逐渐收缩至稳定, 完全饱和OGFC先收缩后膨胀至稳定, 而中等饱和度OGFC在冻结过程中经历收缩—膨胀—收缩3个阶段;对于饱和度较低的OGFC, 降低空隙率可以有效降低其低温收缩率, 对于饱和度较高的OGFC, 较低的空隙率在冻结开始时会产生较大的温度收缩, 在冻结结束时产生较小的膨胀;降低饱和度和空隙率可以有效地提高冻融循环下OGFC的抗飞散能力.
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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.