摘   要：根据“华龙一号”核电工程PX泵房蜗壳区钢筋混凝土结构设计要求，设计了掺多功能外加剂的高性能纤维增强混凝土，研究了混凝土的工作性、力学性能、抗氯离子渗透性能和收缩性能。结果表明：掺或不掺多功能外加剂的混凝土工作性、力学性能、抗氯离子渗透性能和收缩性能均满足工程要求；多功能外加剂的掺入对混凝土的坍落度、抗压强度和氯离子扩散系数影响不大，但能显著提高混凝土的先水中14 d后空气中14 d的限制膨胀率，提高混凝土的补偿收缩能力；工程应用结果表明，掺多功能外加剂的混凝土在连续生产期间的28 d抗压强度符合相关标准中的控制要求，标准差仅为2.72 MPa，说明混凝土的质量稳定、可控。

Abstract: According to the design requirements of reinforced concrete structure in PX pump house volute area of "HPR1000" nuclear power project, the high performance fiber reinforced concrete mixed with multifunctional additives was designed, and the workability, mechanical properties, chloride ion penetration resistance and shrinkage performance of concrete were studied. The results show that the workability, mechanical properties, chloride ion penetration resistance, and shrinkage performance of concrete with or without multifunctional additives meet the engineering requirements. The addition of multifunctional additives has little effect on the slump, compressive strength, and chloride ion diffusion coefficient of concrete, but it can significantly increase the limited expansion rate of concrete in water for 14 days and in air for 14 days, and improve the compensating shrinkage ability of concrete. The engineering application results show that the 28 d compressive strength of concrete mixed with multifunctional additives during continuous production meets the control requirements of relevant standards, with a standard deviation of only 2.72 MPa, indicating that the quality of concrete is stable and controllable.