Three-Stage Evolution of Air Voids and Deformation of Porous-Asphalt Mixtures in High-Temperature Permanent Deformation
Three-Stage Evolution of Air Voids and Deformation of Porous-Asphalt Mixtures in High-Temperature Permanent Deformation
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DOI：
10.1061/(asce)mt.1943-5533.0003300
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发表时间：
2020-09-01
影响因子：
3.2
通讯作者：
Dong, Qiao
中科院分区：
文献类型：
--
作者：
Wang, Xiaowei;Gu, Xingyu;Dong, Qiao
本文的目的是研究高温下多孔沥青混合料的气孔（AV）和变形的演变及其破坏机制。采用先进的重复加载永久变形（ARLPD）试验研究了聚丙烯腈混合料的高温永久变形。设计分期ARLPD试验（第一阶段试验、第二阶段试验和第三阶段试验）和分期x射线计算机断层扫描（CT）扫描试验来评估ARLPD试验中AV和变形的三阶段演变。总AV含量（AVtotal）和互联AV含量（AVinterconnected）在第一阶段降低，AVtotal、AVinterconnected和AVnum数量（AVnum）在第二阶段增加。第三期AVtotal和AVinterconnected减少，AVnum增加。基于AV的变化和直观的图像分析，探讨了PA混合料的破坏机理。第一阶段为致密化阶段，径向变形发展速度快于垂直变形。致密化破坏发生在第三纪，表明竖向变形发展速度快于径向变形。(c) 2020年美国土木工程师学会。
The objective of this paper was to investigate the evolution of air voids (AV) and deformation and the failure mechanism of porous asphalt (PA) mixtures under high temperatures. An advanced repeated loading permanent deformation (ARLPD) test was used to investigate the high-temperature permanent deformation of PA mixtures. A staged ARLPD test (first stage test, secondary stage test, and third stage test) and a staged X-ray computed tomography (CT) scanning test were designed to evaluate the three-stage evolution of the AV and deformation in the ARLPD test. Total AV content (AVtotal) and interconnected AV content (AVinterconnected) decrease in the first stage, and AVtotal, AVinterconnected, and the number of AV (AVnum) increase in the secondary stage. AVtotal and AVinterconnected decrease and AVnum increases in the tertiary stage. Based on the changes of AV and intuitive image analysis, the failure mechanism of PA mixtures was discussed. The first stage is a densification stage, during which radial deformation develops faster than vertical deformation. Densification failure was observed in the tertiary stage, which shows that vertical deformation develops faster than radial deformation. (c) 2020 American Society of Civil Engineers.