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考虑水灰比为0.50、0.25及用量只有最前者一半的水泥净浆浸泡再生粗骨料混凝土制备工艺、普通工艺和两阶段制备工艺,测定了由其拌制的再生混凝土的性能。结果发现,水灰比为0.50的全部水泥净浆浸泡再生骨料制备工艺,可提高再生混凝土28 d的抗压强度,但效果并不显著;56 d抗压强度反而有所降低,这两种龄期的劈拉强度均较低,且抗压强度离散性大;水灰比为0.25的全部水泥净浆浸泡再生骨料制备工艺,抗压、拉强度均最低,抗压、拉强度离散性大。用量一半的水泥净浆浸泡再生骨料工艺,有较高的抗压、拉强度,且强度离散性较小,但不及普通工艺和两阶段制备工艺。两阶段制备工艺不但能提高再生混凝土的抗压强度、劈拉强度,还能改善其工作性能,且强度离散性小,是制备再生混凝土的一种最优工艺。由普通工艺制备的再生混凝土,抗压、抗拉强度值均较高,强度离散性也较小,且工艺简单,也是一种较好的制备工艺。
Considering the preparation process of cement-soaked recycled coarse aggregate concrete with water-cement ratio of 0.50,0.25 and the dosage of only half of the former, common process and two-stage preparation process, the properties of recycled concrete mixed with it were measured. The results showed that the preparation process of soak recycled cement aggregate with a water-cement ratio of 0.50 could improve the compressive strength of recycled concrete for 28 days, but the effect was not significant. On the contrary, the compressive strength decreased on the 56th day. The splitting tensile strength of the age are lower and the compressive strength is more discrete; all the preparation process of soaked recycled cement aggregate with a water-cement ratio of 0.25 has the lowest compression and tensile strength, the compressive and tensile strength discrete Big. Half the amount of cement paste soaked recycled aggregate process, have higher compressive strength, tensile strength, and the strength of the smaller discrete, but less than the ordinary process and two-stage preparation process. The two-stage preparation process can not only improve the compressive strength, splitting tensile strength, but also improve the working performance of recycled concrete, and the intensity dispersion is small, which is an optimal process for preparing recycled concrete. The recycled concrete prepared by the ordinary process has higher compressive and tensile strength values, less intensity dispersion and simple process, and is also a better preparation process.