Hui Cun, Liu Yan, Hai Ran, Liu Mingliang
School of Architecture and Civil Engineering, Zhongyuan University of Technology, Zhengzhou 450007, China.
Shaanxi Architecture Science Research Institute Co., Ltd., Xi'an 710082, China.
Materials (Basel). 2022 Sep 2;15(17):6104. doi: 10.3390/ma15176104.
In order to study the workability and mechanical performance of high fluidity recycled concrete, parallel tests were carried out to prepare high fluidity recycled concrete by changing the amount of recycled aggregate (20%, 30%, 40%, 50% and 60%) and the sand ratio (0.37, 0.38, 0.39 and 0.40). The fluidity, compression strength, tensile strength and flexural strength of each mix were tested. The results show that the slump of a recycled concrete mixture is 120 mm when the content of recycled aggregate is less than 30%, and the mechanical strength satisfies the requirement of the high fluidity ordinary concrete. As the ratio of sand increases, the fluidity of the recycled concrete also improved. The best sand ratio is not consistent with the strength index. When the sand ratio is between 0.37 and 0.40 and the content of recycled aggregate is not more than 40%, the concrete of C60 can be prepared. Both the fluidity and the strength index can meet the design requirements and can be used in the practical engineering.
为研究高流动性再生混凝土的工作性能和力学性能，通过改变再生骨料用量（20%、30%、40%、50%和60%）和砂率（0.37、0.38、0.39和0.40）进行平行试验来制备高流动性再生混凝土。对各配合比的流动性、抗压强度、抗拉强度和抗折强度进行了测试。结果表明，当再生骨料含量小于30%时，再生混凝土拌合物的坍落度为120mm，力学强度满足高流动性普通混凝土的要求。随着砂率的增加，再生混凝土的流动性也有所提高。最佳砂率与强度指标不一致。当砂率在0.37至0.40之间且再生骨料含量不超过40%时，可制备出C60混凝土。流动性和强度指标均能满足设计要求，可应用于实际工程。
