双膨胀水泥是在中热和低热矿渣硅酸盐水泥基础上 ,同时利用了钙矾石与氧化镁二者的膨胀 .本文对此种水泥拌制的混凝土的自生体积变形、在钢筋约束下的膨胀应力以及约束试件的强度进行了试验 .结果表明 ,双膨胀水泥混凝土具有较好的微膨胀性 ,在早期与后期均能产生一定的膨胀 ,在钢筋约束条件下能够产生比较稳定的预压应力 ,约束试件的强度比没有约束时有所提高 ,适用于具有一定约束条件的水工混凝土 Double-expansion cements are based on mesothermal and low-heat slag Portland cement and utilize both the expansions of both ettringite and magnesia.In this paper, the self-generated volume deformation of concrete mixed with cement is restrained by the reinforcement The expansion stress and the strength of the constrained specimen were tested.The results show that the double-expansion cement concrete has good micro-expansibility and can produce some expansion in the early and late stages, and can produce a relatively stable pre-compression Stress, restraint specimen strength than without restraint has improved, apply to a certain constraint hydraulic concrete