|Table of Contents|

Performance evolution law and gradation recommendation of porous asphalt concrete under freeze-thaw action(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2025年03期
Page:
39-51
Research Field:
道路工程
Publishing date:

Info

Title:
Performance evolution law and gradation recommendation of porous asphalt concrete under freeze-thaw action
Author(s):
SI Wei1;  LUO Xiang-yu1;  PANG Guang-wei1;  PU Chao2;  WANG Hua-tao2;  WANG Bin2; YANG Ruo-cong3;  LIU Jie2
(1. Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang'an University,Xi'an 710064, Shaanxi, China; 2. Xinjiang Key Laboratory for Safety and Health of Transportation Infrastructure in Alpine and High-Altitude Mountainous Areas, Xinjiang Transportation Planning,Survey and Design Institute Co., Ltd., Urumqi 830006, Xinjiang, China; 3. CCCC Civil Engineering Science and Technology Co., Ltd., Xi'an 710075, Shaanxi, China)
Keywords:
road engineering;  porous asphalt concrete;  freeze-thaw cycle;  void structure;  mechanical property
PACS:
U416.2
DOI:
10.19721/j.cnki.1671-8879.2025.03.004
Abstract:
To investigate the effects of freeze-thaw action on the structure, performance and service life of porous asphalt concrete(PAC), and to recommend suitable gradation types and optimal void contents of PAC in cold regions, the X-ray computed tomography(CT)and digital image processing(DIP)technology were employed to extract the three-dimensional void network of PAC and quantify its structural parameters. Low-temperature splitting tests, uniaxial compression tests, and indirect tensile fatigue tests were conducted to study the evolution laws of void structure parameters, low-temperature splitting strength, uniaxial compressive strength, and fatigue life of PAC under freeze-thaw action. Based on the evolutions of void structure and concrete performance, a mix proportion optimization method based on multi-criteria decision analysis theory was established for PAC in cold regions. The research results reveal that during the process of 0-12 freeze-thaw cycles, the internal void content of PAC increases rapidly, mainly due to the interconnected expansion among voids. After 12 freeze-thaw cycles, the further generation of small voids becomes the primary mechanism for the increase in the void content. Therefore, the freeze-thaw cycle is divided into early stage as 0-12 freeze-thaw cycle action and later stage as 13-20 freeze-thaw cycle action. During the freeze-thaw cycle process, the voids larger than 10 mm2 gradually increase in proportion at the early stage and then slowly decrease at the later stage, whereas the voids smaller than 10 mm2 exhibit the opposite trend. The attenuations in the low-temperature splitting strength, uniaxial compressive strength and fatigue life of PAC are closely related to the nominal maximum aggregate size and void content. Under non-freeze-thaw condition, void content has a more pronounced effect on the low-temperature splitting strength, while under freeze-thaw condition, the nominal maximum aggregate size has more significant impact on the low-temperature splitting strength, uniaxial compressive strength and fatigue life. The PAC-13b gradation characterized by a smaller nominal maximum aggregate size and a void content within 21%-22% exhibits the best performance against freeze-thaw damage.5 tabs, 10 figs, 30 refs.

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Last Update: 2025-05-30