Study on the bonding properties of Engineered Cementitious Composites (ECC) and existing concrete exposed to high temperature

被引：77
作者：
Gao, Shuling [1 ,2 ]
Zhao, Xiaochong [1 ]
Qiao, Jinli [1 ]
Guo, Yadong [3 ]
Hu, Guanhua [1 ]
机构：
[1] Hebei Univ Technol, Sch Civil & Transportat Engn, Tianjin 300401, Peoples R China
[2] Civil Engn Technol Res Ctr Hebei Prov, Tianjin 300401, Peoples R China
[3] China Construct Eighth Engn Div Corp Ltd, Tianjin Branch, Tianjin 300450, Peoples R China
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2019年 / 196卷
基金：
中国国家自然科学基金;
关键词：
ECC; High temperature; Slant shear strength; Splitting tensile strength; Interfacial bonding; MECHANICAL-PROPERTIES; FLY-ASH; ELEVATED-TEMPERATURE; FRACTURE-BEHAVIOR; FIRE RESISTANCE; STRENGTH; PERFORMANCE; FIBER; HYBRID; REPAIR;
D O I：
10.1016/j.conbuildmat.2018.11.136
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
This paper researches the bonding properties between the existing concrete and ECC by 66 slant shear and 66 split tensile specimens exposed to 22 degrees C, 200 degrees C, 400 degrees C, 600 degrees C and 800 degrees C. The existing concrete was firstly heated from room temperature (22 degrees C) to 200 degrees C, 400 degrees C, 600 degrees C and 800 degrees C, and then reinforced by the repairing material (strengthening concrete and ECC) respectively, named as Type A Test. While, another is that existing concrete is firstly reinforced by repairing material, and then the repaired specimens are heated from room temperature (22 degrees C) to 200 degrees C, 400 degrees C, 600 degrees C and 800 degrees C, as Type B Test. In Type A Test, when its temperature is below 200 degrees C, the slant shear strength and the splitting tensile strength increase with the temperature increasing, and the bonding performance is improved. However, when the temperature is above 200 degrees C, the slant shear and splitting tensile strength gradually decrease and the bonding performance declines with the temperature increasing. In addition, the bonding performance of the existing concrete/ECC is higher than that of the existing concrete/strengthening concrete at the same high temperature. In Type B Test, when its temperature was rose from room temperature to 600 degrees C, it is beneficial to the bonding performance of the existing concrete/ECC. Furthermore, a serious burst happened in the existing concrete/strengthening concrete specimens at 600 degrees C. But no burst happened in existing concrete/ECC specimens even at 800 degrees C, which ensured the integrity of the repairing system. (C) 2018 Elsevier Ltd. All rights reserved.
引用
收藏
页码：330 / 344
页数：15
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