Based on the introduction of the basic concept of mass concrete and the classification of cracks, through the study of the causes of mass concrete cracks, this paper puts forward the matters needing attention in the actual construction and how to prevent them. Thirdly, the control and repair methods of the massive cracks are proposed. Finally, this paper takes the overflow dam section of a hydropower station as an example to analyze and deal with the re pouring concrete construction operation.<br>
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