本文研究了C70自密实混凝土的工作性能、力学性能及耐久性能。所配制的自密实混凝土初始坍落度260mm、扩展度690mm、倒坍时间9.2s、U型槽填充高度330mm,可以满足自密实的要求,2h坍落度无损失;28d抗压强度达到104.8MPa;所配制的混凝土抗渗性能良好、抗Cl-渗透性能良好,28d收缩值比普通混凝土小23.8%,各龄期抗碳化性能良好。 This paper studies the work performance, mechanical properties and durability of C70 self-compacting concrete. The self-compacting concrete with initial slump of 260mm, extension of 690mm, collapsing time of 9.2s and filling height of U-shaped groove of 330mm can satisfy self-compacting requirements without loss of slump in 2h, compressive strength of 28.8d The prepared concrete has good impermeability, good resistance to Cl-permeation, and the shrinkage value at 28 days is 23.8% smaller than ordinary concrete, and the anti-carbonation performance is good at all ages.