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传统设计法设计出的自密实混凝土集料含量偏低、胶凝材料用量较高,成本高昂,机制砂的应用增加了自密实混凝土配制难度。从集料级配优化、组成设计和流变改性着手制备一种生态机制砂自密实混凝土并研究了堆叠率、砂的体积率,胶凝材料和水粉比对Eco-SCC工作性能、物理性能的影响。研究表明:利用级配合理的机制砂,在堆叠率为0.6及砂的体积率不超过0.44的条件下能制备出性能满意的Eco-SCC;其流动性受堆叠率和砂的体积率影响显著,强度随水粉比、砂的体积率升高而降低,合理的胶凝材料的用量对SCC强度有利。
The traditional design method to design the self-compacting concrete aggregate content is low, the high amount of cementitious material, high cost, the application of machine-made sand increased self-compacting concrete preparation difficulty. From the optimization of aggregate gradation, compositional design and rheology modification, a kind of eco-mechanism sand self-compacting concrete was prepared and the effects of stacking ratio, volume fraction of sand, cementitious material and grit ratio on the working performance, physical properties Impact. The results show that, with graded rationally prepared sand, Eco-SCC with satisfactory performance can be prepared under the condition of a stacking ratio of 0.6 and a volume fraction of sand of not more than 0.44. The flowability is significantly affected by the stacking ratio and the volume fraction of sand , The intensity decreases with the increase of volume ratio of grit and sand, and the dosage of reasonable cementitious material is good for the strength of SCC.