Evaluation of Crack Repair Effect for RC Slab Using AE Tomography

Proceedings

Hashimoto, Katsufumi¹  Okude, Nobuhiro²  Nishida, Takahiro³  Furuno, Syogo⁴  Shiotani, Tomoki⁵ 

[1] Author to whom correspondence should be addressed.;Department Civil & Earth Resources Engineering, Kyoto University, C3-b4S15, Nishikyo, Kyoto 615-8540, Japan;New Nippon Consultants Co., Ltd., 910-41, Yoshizukuri, Toyama 930-0142, Japan;Presented at the 18th International Conference on Experimental Mechanics (ICEM18), Brussels, Belgium, 1–5 July 2018.;Tokai Technology Center, 2-710, Inokoshi, Meito, Nagoya 465-0021, Japan

关键词: RC slab;    AE tomography;    crack injection;    repair;    alkali-silica reaction;   

DOI  :  10.3390/ICEM18-05331

学科分类：社会科学、人文和艺术（综合）

来源: mdpi

【 摘 要 】

Three reinforced concrete (RC) slab-panels are repaired by using the crack injection method. This is because web-shaped crack networks are observed after 46 years in service. In the present research, an attempt is made to confirm the effectiveness of the repair by comparing the velocity distribution of elastic waves obtained from Acoustic Emission (AE) tomography analysis, before and after the repair. Thus, the velocity recoveries due to injection are found in all of the slab panels, and it is confirmed that the elastic wave velocities obtained using this technique can serve as an indicator for examining the state of crack and void filling with injected material. Further, a good correlation is found between the low-velocity region before repair and the amount of injection. These results show the potential of the AE tomography technique to be used as a method for estimating the effect of injection repair.

【 授权许可】

CC BY