Experimental investigation on the dynamic behaviors of UHPFRC after exposure to high temperature

被引：26
作者：
Yang, Yekai [1 ,3 ]
Wu, Chengqing [2 ]
Liu, Zhongxian [1 ]
Liang, Xiangwei [2 ]
Xu, Shenchun [3 ]
机构：
[1] Tianjin Chengjian Univ, Tianjin Key Lab Civil Struct Protect & Reinforcem, Tianjin 300384, Peoples R China
[2] Univ Technol Sydney, Ctr Built Infrastruct Res, Sch Civil & Environm Engn, Sydney, NSW 2007, Australia
[3] Tianjin Univ, Tianjin 300072, Peoples R China
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2019年 / 227卷
基金：
中国国家自然科学基金;
关键词：
UHPFRC; SHPB; High temperature; Strain-stress curve; DIF; SEM; HIGH-PERFORMANCE CONCRETE; HIGH-STRENGTH CONCRETE; MECHANICAL-PROPERTIES; COMPRESSIVE BEHAVIOR; ELEVATED-TEMPERATURES; STRAIN-RATE; NANOCOMPOSITES;
D O I：
10.1016/j.conbuildmat.2019.116679
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Split Hopkinson pressure bar (SHPB) tests were conducted to experimentally study the dynamic behaviors of ultra-high-performance fiber-reinforced concrete (UHPFRC) after being first exposed to elevated temperatures, followed by cooling. The dynamic stress-strain relationships were measured as key parameters to study the effects of high temperature on the dynamic behaviors of fire-damaged UHPFRC. In addition, dynamic increase factor (DIF) values for the dynamic compressive strength were generated. It was found that the strength of UHPFRC increased with the increase in strain rates with high temperatures. A significant difference in the dynamic compressive strength was found under two different temperature scenarios, i.e., elevated temperatures and cooling. Scanning electron microscopy (SEM) analysis was conducted to understand the macroscopic failure phenomenon, element composition and concrete hydration process. The results provide a basis for assessing the impact resistance and anti-collapse resistance of fire-damaged UHPFRC structures. (C) 2019 Elsevier Ltd. All rights reserved.
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页数：15
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