EXPERIMENTAL VERIFICATION ON IMPROVING LONG-TERM HEALTH OF LINING CONCRETE BY CONTROLLING CRACKS

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  • 覆工コンクリートのひびわれ抑制による長期健全性向上に向けた実験的検証

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In the study, we carried out laboratory experiments and numerical analysis to verify how the curing environment and construction method of lining concrete cause cracks, so that we may prevent concrete pieces from falling and improve the long-term health of lining concrete. As a result, we found that the necessary compactness of concrete surface can be secured, if the concrete is cured in a wet condition for 7 days. As for the construction method, applying excessive compaction energy did not have a major impact on the quality of concrete. We also analyzed the crack propagation based on the physical properties obtained from laboratory tests. It was found that harmful cracks were not generated in the short-term (50 days), and in the long-term (50 years), occurrence and crack propagation caused by shrinkage strain of the concrete were not influenced by the curing environment. Based on these findings, we will propose construction management guidelines for medium-fluidity lining concrete.

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