Experimental investigation of the bond strength between new to old concrete using different adhesive layers
Experimental investigation of the bond strength between new to old concrete using different adhesive layers
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不同粘结层新旧混凝土粘结强度的试验研究
DOI：
10.1016/j.conbuildmat.2020.118798
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发表时间：
2020-07-20
影响因子：
7.4
通讯作者：
Sarwar, Muhammad Azam
中科院分区：
文献类型：
--
作者：
Rashid, Khuram;Ahmad, Madiha;Sarwar, Muhammad Azam
本工作旨在评估基层混凝土和新覆盖混凝土之间的粘结层的性能，在拉应力和剪应力的作用下。在真实的应用中经常使用的四种类型的粘合剂层（即，水泥净浆、环氧树脂粘结剂、丁苯橡胶（SBR）-胶乳和碳纤维增强聚合物（CFRP）。通过劈裂、双面和斜剪强度试验，对复合材料试件进行了拉伸、剪切和拉剪复合应力下的性能测试。SBR-胶乳通过形成聚合物膜而具有上级粘结性能，因此在拉伸和剪切应力的联合作用下，对修复系统显示出有希望的结果。正如预期的那样，CFRP表现出最高的强度时，这种复合材料系统的作用下的拉伸或剪切应力，并有很强的潜力，用于连接预制构件。水泥净浆是一种广泛使用的粘接修复材料，由于其脆性，在拉伸试验中表现出较差的抵抗力。此外，断裂表面的粗糙度进行了量化，并在细观层次上解释了故障模式。这项工作的结果可以指导设计人员在选择合适类型的粘合剂层的复合材料结构，可能是拉伸，剪切或拉伸剪切应力。(C)2020爱思唯尔有限公司版权所有。
This work was designed to evaluate the performance of adhesive layers between substrate concrete and freshly overlaid concrete, under the action of tensile and shear stresses. Four types of adhesive layers that are frequently used in real applications (i.e., cement paste, epoxy bonding agent, styrene butadiene rubber (SBR)-latex and carbon fiber reinforced polymer (CFRP)) were selected. Composite specimens were tested to evaluate their performance under tension, shear and tension-shear stress by split, bi-surface and slant shear strength tests. SBR-latex showed a promising result for repaired systems under the combined action of tensile and shear stresses due to its superior adhesive property via the formation of a polymer film. As expected, CFRP showed the highest strength when such composite systems were under the action of tensile or shear stresses and had a strong potential for use for jointing precast members. Cement paste, which is a widely used adhesive repair material, showed poor resistance in the tension test due to its brittle nature. In addition, the roughness of the fractured surfaces was quantified and the failure modes were explained at the meso-level. The outcomes of this work may guide designers in the selection of appropriate types of adhesive layers for a composite structure that may be under tensile, shear or tensile-shear stress. (C) 2020 Elsevier Ltd. All rights reserved.