Fracture behaviour of steel fibre reinforced recycled aggregate concrete after exposure to elevated temperatures
Fracture behaviour of steel fibre reinforced recycled aggregate concrete after exposure to elevated temperatures
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DOI：
10.1016/j.conbuildmat.2016.10.072
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发表时间：
2016-12-15
影响因子：
7.4
通讯作者：
Zhang, H. Z.
中科院分区：
文献类型：
--
作者：
Chen, G. M.;Yang, H.;Zhang, H. Z.
在过去的十年中，再生骨料混凝土（RAC）的应用研究，使用再生混凝土骨料（RCA），吸引了世界范围内的兴趣，由于其社会，环境和潜在的经济效益。在建筑物中使用这种混凝土的主要问题之一是其在火灾中的剥落和火灾后的残余机械性能。通过加入钢纤维形成钢纤维增强再生骨料混凝土（SFRAC），可以缓解这种担忧。在这项研究中，对60根缺口梁进行了测试，以评估SFRAC在高温下的断裂行为，包括弹性模量（E）、断裂能（G（F））、起裂断裂韧性K-lc（ini）和不稳定断裂韧性K-lc（un）。研究了钢纤维体积含量（0%、0.5%、1%和1.5%）和暴露温度（室温、200 ℃、400 ℃和600 ℃）的影响。试验结果表明，钢纤维的加入延缓了再生混凝土中裂纹的萌生，限制了裂纹的张开，从而显著提高了再生混凝土高温后的断裂能和断裂韧性。(C)2016爱思唯尔有限公司版权所有
In the past decade, research on applications of recycled aggregate concrete (RAC), which uses recycled concrete aggregate (RCA), has attracted world-wide interest due to their social, environmental and potential economic benefits. One of the main concerns for using such concrete in buildings is its spalling in fire and post-fire residual mechanical properties. This concern may be alleviated by adding steel fibres to form steel fibre reinforced recycled aggregate concrete (SFRAC). In this study, 60 notched beams were tested to evaluate the fracture behaviour of SFRAC after exposure to elevated temperatures, including the modulus of elasticity (E), fracture energy (G(F)), initiation fracture toughness K-lc(ini) and unstable fracture toughness K-lc(un). The effects of steel fibre volume content (0%, 0.5%, 1% and 1.5%) and exposure temperature (room temperature, 200 degrees C, 400 degrees C and 600 degrees C), were investigated. The test results show that the addition of steel fibres postpones the initiation of cracks and limits their opening in RAC, and thus significantly enhances the fracture energy and fracture toughness of RAC after exposure to high temperatures. (C) 2016 Elsevier Ltd. All rights reserved.