On the treatment of thermal cracks in lining concrete of water conveyance system of Three Gorges Project permanent ship locks |
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| Authors: | Cong-feng Wang De-fu Liu Dong-dong Wang Ya-hui Duan |
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| Affiliation: | [1]School of Water Resources and Hydropower, Wuhan University, Wuhan 430072, China [2]College of Civil andHydroelectric Engineering, Three Gorges University, Yichang 443002, China [3]Department of Civil Engineering,Xiamen University, Xiamen 361005, China |
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| Abstract: | A comprehensive investigation was performed for repairing the different types of cracks appearing on the surface or inside
the concrete lining at various depths. The material properties used in grouting and two methods for crack repair were discussed
in details, and consequently reliable repair measures were proposed and implemented. It is a better choice to adopt the hole-drilling
method for the relatively regular crack. The grouting pressure should not be too high and it is generally between 0.4∼0.6
MPa. For the second time grouting, the pressure maybe increased to 0.8 MPa. Other method is the pasting nozzles method which
is more suitable for irregular cracks such as cracks with intensive density and crossing cracks. Its grouting pressure is
generally between 0.6∼1.0 MPa. The in-situ tests in Three Gorges Project demonstrate favorably the feasibility and applicability
of the proposed methods for crack repair within the lining concrete.
Supported by the National Natural Science Foundation of China (10602049) |
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| Keywords: | thermal cracks lining concrete Three Gorges Project permanent ship locks |
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