Detection and analysis of concrete cracks in raft foundation and external wall of a basement

Cracks and water seepage occurred in the raft foundation and basement exterior wall concrete of a commercial complex after construction. After demonstration by an expert group, in order to accurately analyze the causes of concrete cracks, the reinforced protective layer and concrete entity at the cracks were detected by steel bar scanning, core drilling sampling and impact echo method. After detection, some concrete cracks have been penetrated inside and outside, and there are many bubbles formed by insufficient vibration in concrete core samples at individual crack positions. The main reasons for concrete cracks are that the pouring interval is long during concrete construction, local positions are not vibrated tightly, and the concrete cannot be cured after pouring. According to the above test results, after the construction unit treated the concrete cracks according to the high-pressure grouting scheme, no leakage was found after observation, which achieved good results and has been put into normal use.