主管:中华人民共和国应急管理部
主办:应急管理部天津消防研究所
ISSN 1009-0029  CN 12-1311/TU

Fire Science and Technology ›› 2025, Vol. 44 ›› Issue (2): 236-241.

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Experimental study on shear behavior of fiber-reinforced high-strength grout-concrete interface after elevated temperature

Xu Chen1, Mao Xiaoyong1,2, Zhu Yong1, Cai Xinjiang1   

  1. (1. School of Civil Engineering, Suzhou University of Science and Technology, Suzhou Jiangsu 215011, China;2. Suzhou City University, Suzhou Jiangsu 215104, China)
  • Received:2024-04-10 Revised:2024-08-02 Online:2025-02-15 Published:2025-02-15

Abstract: To examine the shear behavior of the interface between concrete and fiber-reinforced high-strength grout after high-temperature exposures, Z-type double shear test specimens were designed and tested via ther‐ mal and push-out shear experiments. The test parameters include temperatures of 20, 100, 300, 500, and 600 ℃, interface roughness and grout strength. The results show that the shear resistance of the interface decreases with the increase in temperature. By improving the interface roughness, the interfacial shear capacity was enhanced, and the efficiency of the enhancement remained relatively stable as the temperature increased. Moreover, the shear resistance of the interface was found to be positively correlated with the strength of the grout.

Key words: post-elevated-temperature, concrete-CGM interface, shear resistance, interface roughness