English：

Hualong No.1 Nuclear Island project has the characteristics of long construction period and design service life, and has particularly strict requirements on the crack resistance, durability and workability of structural concrete. Stability is the cornerstone of the development of high?performance concrete for the nuclear island project. According to the technical requirements of concrete nuclear power, starting from the quality control of raw materials and in combination with the durability requirements, the benchmark mix proportion is screened and determined, and the concrete mix proportion is finally determined and optimized through laboratory trial mixing, machine mixing, pumping test and concrete performance test. The practice shows that the scheme of mix proportion adopted meets the requirement of design and quality.