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Waste Water Treatment Building of the Multi National Company located in Cikande of Banten Province in Indonesia has experienced a poor function due to seepage and leakage on its reinforced concrete walls. The height of the reinforced concrete wall was 12 meters. This paper describes the surveys, investigations and repair conducted to overcome the seepage and leaks in the reinforced concrete walls. The feasibility of its concrete was investigated using Ultrasonic Pulse Velocity (UPV). The feasibility of the concrete was reviewed based on 2 (two) factors: (1) homogeneity and (2) crack depth. The result of the survey and investigation showed that the quality of homogeneity was enough and was pretty good and the average crack depth was about h = 102,5 mm. The method of repairing used was: (1) crack injection using epoxy, (2) leakage injection using cement modified polymer material and (2) waterproof coating using a cement-based coating. To prove the success of the repairing, pond testing was conducted for 14 days. Based on the test result, there was no leakage and seepage during the pond testing.

Survey, investigation and repairing on concrete wall of waste water treatment building