Use of high strength Strain-Hardening Cementitious Composites for flexural repair of concrete structures with significant steel corrosion
Use of high strength Strain-Hardening Cementitious Composites for flexural repair of concrete structures with significant steel corrosion
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DOI：
10.1016/j.conbuildmat.2018.02.009
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发表时间：
2018-04-10
影响因子：
7.4
通讯作者：
Leung, Christopher K. Y.
中科院分区：
文献类型：
--
作者：
Chen, Yixin;Yu, Jing;Leung, Christopher K. Y.
钢筋锈蚀是钢筋混凝土结构劣化的主要原因，导致钢筋面积损失严重，影响结构安全。最常见的修复方法是将额外的钢筋拼接到腐蚀的钢筋上，这是耗时且昂贵的，因为必须移除腐蚀部分之外的大量优质混凝土以提供足够的搭接长度。本研究探索了一种新的修复技术，使用高强度应变硬化水泥基复合材料（SHCC）在上述情况。SHCC补偿了钢筋的面积损失，不需要拼接额外的钢筋或移除大量的混凝土。本文首先讨论了高强SHCC的设计问题。然后，将减小面积的钢筋埋入SHCC试块中，进行直接拉伸试验。此外，梁含有钢筋减少面积和修补SHCC下四点弯曲进行了测试。不同尺度下的试验结果验证了所提出的修复技术的可行性，该技术效率更高，成本更低。这项研究的结果可以支持未来的修复应用SHCC。(C)2018爱思唯尔有限公司版权所有。
Steel corrosion is a major cause of deterioration for reinforced concrete structures, leading to significant area loss of rebars that affects structural safety. The most common repair approach is to splice additional reinforcements to the corroded rebars, which is time consuming and costly, as a large volume of sound concrete beyond the corroded part must be removed to provide sufficient lap lengths. The present study explores a new repair technique using high strength Strain-Hardening Cementitious Composites (SHCC) in the aforementioned situation. With SHCC compensating for the area loss of rebars, splicing additional reinforcements or removing a large amount of concrete is not necessary. In this paper, the design of high strength SHCC was first discussed. Then, rebars with reduced area were embedded inside SHCC blocks and tested under direct tension. Further, beams containing rebars with reduced area and patched with SHCC were tested under four-point bending. The test results at different scales verify the feasibility of the proposed repair technique which is more efficient and less costly. The findings of this study can support future repair applications using SHCC. (C) 2018 Elsevier Ltd. All rights reserved.