Behaviour of recycled tyre polymer fibre reinforced concrete at elevated temperatures
Behaviour of recycled tyre polymer fibre reinforced concrete at elevated temperatures
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DOI：
10.1016/j.cemconcomp.2021.104257
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发表时间：
2021-09-16
影响因子：
10.5
通讯作者：
Zhang, Mingzhong
中科院分区：
文献类型：
--
作者：
Chen, Meng;Sun, Zhihao;Zhang, Mingzhong
本文对再生轮胎聚合物(RTP)纤维用于减轻混凝土高温损伤的可行性进行了系统的研究。通过一系列试验研究了RTP纤维对高温(20℃、105℃、250℃、400℃和600℃)下混凝土的力学和热性能、孔压积累和微观结构演变的影响，并在此基础上探讨了RTP纤维减轻混凝土损伤的机理。结果表明，由于RTP纤维的熔融和RTP纤维与混凝土之间的温度不相容促进了混凝土连通孔隙-微裂缝网络的形成，RTP纤维的掺入有效地防止了孔压积累，显着减轻了混凝土在高温下的损伤。RTP纤维被证明是一种有前途的可持续替代人造聚合物纤维的材料，用于增强混凝土的高温和耐火性能。综合考虑减损效果和强度损失，RTP纤维的最佳掺量为1.2 kg/m~3。
This paper presents a systematic study on the feasibility of using recycled tyre polymer (RTP) fibres for mitigating the damage of concrete induced by elevated temperatures. A series of tests were conducted to investigate the effect of RTP fibres on mechanical and thermal behaviour, pore pressure build-up and microstructural evolution of concrete exposed to elevated temperatures (20, 105, 250, 400 and 600 degrees C), based on which the mechanism of RTP fibres in mitigating damage of concrete was explored. Results indicate that the addition of RTP fibres effectively prevented pore pressure accumulation and significantly mitigated damage of concrete at high temperatures as the melting of RTP fibres and thermal incompatibility between RTP fibres and concrete promoted the formation of interconnected pore-microcrack network of concrete. RTP fibre was proved as a promising sustainable alternative to manufactured polymer fibres for enhancing high temperature and fire resistance of concrete. The optimal RTP fibre content was 1.2 kg/m3 considering the damage mitigation efficiency and strength loss.