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http://dx.doi.org/10.12989/cac.2019.24.3.249

Recovery of mortar-aggregate interface of fire-damaged concrete after post-fire curing  

Li, Lang (Failure Mechanics & Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province, College of Architecture & Environment, Sichuan University)
Zhang, Hong (Key Laboratory of Deep Underground Science and Engineering, Ministry of Education, Sichuan University)
Dong, Jiangfeng (Failure Mechanics & Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province, College of Architecture & Environment, Sichuan University)
Zhang, Hongen (Failure Mechanics & Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province, College of Architecture & Environment, Sichuan University)
Jia, Pu (Institute for Disaster Management & Reconstruction, Sichuan University)
Wang, Qingyuan (Failure Mechanics & Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province, College of Architecture & Environment, Sichuan University)
Liu, Yongjie (Key Laboratory of Deep Underground Science and Engineering, Ministry of Education, Sichuan University)
Publication Information
Computers and Concrete / v.24, no.3, 2019 , pp. 249-258 More about this Journal
Abstract
In order to investigate the strength recovery of fire-damaged concrete after post-fire curing, concrete specimens were heating at $2^{\circ}C/min$ or $5^{\circ}C/min$ to 400, 600 and $800^{\circ}C$, and these exposed specimens were soaked in the water for 24 hours and following by 29-day post-fire curing. The compressive strength and split tensile strength of the high-temperature-exposed specimens before and after post-fire curing were tested. The proportion of split aggregate in the split surfaces was analyzed to evaluate the mortar-aggregate interfacial strength. After the post-fire curing process, the split tensile strength of specimens exposed to all temperatures was recovered significantly, while the recovery of compressive strength was only obvious within the specimens exposed to $600^{\circ}C$. The tensile strength is more sensitive to the mortar-aggregate interfacial cracks, which caused that the split tensile strength decreased more after high-temperature exposure and recovery more after post-fire curing than the compressive strength. The mortar-aggregate interfacial strength also showed remarkable recovery after post-fire curing, and it contributed to the recovery of split tensile strength.
Keywords
concrete; high temperature; post-fire curing; mortar-aggregate interface, image analysis;
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Times Cited By KSCI : 3  (Citation Analysis)
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