Causes and Prevention of Cracks in Large Channel Concrete
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Abstract:
We analyzed the impacts of cement type, fly ash, and fiber on the shrinkage of lining concrete according to the structural features and situation of large channel lining concrete, and the shrinkage included plastic shrinkage，drying shrinkage, and autogenous shrinkage. The results showed that (1) the concrete shrinkage reduces effectively with high-quality fly ash adding into the concrete mixture; (2) the shrinkage resistance of concrete improves with fiber adding into the concrete mixture; (3) P·O42.5 cement has higher shrinkage resistance than P·C32.5 cement; and (4) the concrete has high crack resistance with high-quality fly ash and fiber adding into concrete and the usage of P·O42.5 cement. In order to prevent the channel concrete cracks, several recommendations were proposed according to the characteristics and impact factors of different cracks.
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