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Proceedings 2018, 2(8), 433;

Evaluation of Crack Repair Effect for RC Slab Using AE Tomography

Department Civil & Earth Resources Engineering, Kyoto University, C3-b4S15, Nishikyo, Kyoto 615-8540, Japan
Tokai Technology Center, 2-710, Inokoshi, Meito, Nagoya 465-0021, 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.
Author to whom correspondence should be addressed.
Published: 11 June 2018
PDF [1919 KB, uploaded 22 June 2018]


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.
Keywords: RC slab; AE tomography; crack injection; repair; alkali-silica reaction RC slab; AE tomography; crack injection; repair; alkali-silica reaction
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Okude, N.; Shiotani, T.; Nishida, T.; Hashimoto, K.; Furuno, S. Evaluation of Crack Repair Effect for RC Slab Using AE Tomography. Proceedings 2018, 2, 433.

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