摘   要：针对长沙地铁地下水充沛的特点，通过内掺水泥基渗透结晶型材料（简称CCCW）和硅灰，外涂CCCW和聚氨酯涂料的方法，制备地铁管片混凝土。对其抗水渗透性能、抗氯离子渗透性能及早期收缩性能进行分析，并结合预制生产工艺，得出地铁管片混凝土抗渗梯度设计及工程应用的技术措施。研究表明，CCCW对混凝土一次抗压强度和一次抗渗性能没有明显改善，对其二次抗压强度和二次抗渗性能则改善明显；混凝土掺入硅灰有利于提高其抗渗性能，使其电通量减小，内部孔径分布更合理；地铁管片混凝土初凝后150h收缩率小于0.00020，早期收缩小可降低开裂风险。涂层改善地铁管片混凝土抗渗性能较明显，可用于恶劣的渗水环境，满足抗渗梯度设计的需求。

Abstract: According to abundant groundwater environment of Changsha metro, mixed cementitious capillary crystalline waterproofing materials (hereinafter referred to as CCCW) and silica fume, coated CCCW and polyurethane, the metro segment concrete was prepared. The water impermeability, chloride ion impermeability and shrinkage performance of concrete were analyzed. Researches were combined with production process of prefabricated so that technical measures of concrete impermeability gradient design and engineering application were obtained. Results show that CCCW have no obvious improvement on primary compressive strength and impermeability of concrete, however, the secondary compressive strength and impermeability are improved significantly. Silica fume can improve the impermeability of concrete, decrease its electric flux and make inner pore distribution more reasonable. Metro segment concrete shrinkage rate is less than 0.00020 after initial set 150h so that crack risk can be reduced. Coating improves the impermeability obviously of metro segment concrete which can be used in harsh water environment to meet the impermeability gradient design requirement.