Technique and Practice on Temperature Control and Crack Prevention for RCC Dam at High Altitude in Tibet

Abstract

The dam in the DG Hydropower Station is currently the world’s highest roller compacted concrete gravity dam. The temperature control and crack prevention of concrete under special climatic conditions have become a key technical problem in dam construction. To avoid temperature cracks in the dam, the proportion of raw materials is determined in accordance with casting time, climatic conditions, and raw material performance parameters. Furthermore, the concrete mix ratio is optimized, and concrete with high cracking resistance, relatively low hydration heat, optimal VC value, and good rolling and bleeding properties is prepared. It effectively prevents the occurrence of temperature cracks in dams and solves the technical problem of temperature control and crack prevention for RCC dam construction in high-altitude areas.