砂率对自密实混凝土工作性能的影响  

Effect of sand ratio on working performance of self-compacting concrete

作　　者：徐杰[1] 叶燕华[1] 朱铁梅[1] 薛洲海[1] 

机构地区：[1]南京工业大学土木工程学院,江苏南京210009

出　　处：《混凝土》2013年第4期101-103,115,共4页Concrete

基　　金：国家自然科学基金(51178218)

摘　　要：研究了砂率对自密实混凝土工作性能的影响,随着砂率的增加,混凝土的塑性黏度降低,流动性提高,提高了拌合物的钢筋通过能力,同时,砂率必须控制在一定的范围之内才能保证自密实混凝土工作性能良好。砂率对自密实混凝土模板侧向压力也有影响。砂率越大,初始侧向压力越高,下降速度越慢。The effect of sand ratio on working performance of self-compacting concrete had been investigated.The higher the sand ratio was,the lower the plastic viscosity of fresh concrete was.At the same time,the flow rate increased,that led to a better ability to pass through the spacing of bars.Meanwhile in order to keep the working performance of self-compacting concrete well, the sand ratio should be limited in a certain range.The lateral pressure of formwork had a close relationship with the sand ratio,the higher the sand ratio was, the greater the initial lateral pressure was, and also the slower the descent speed was.

关 键 词：砂率 自密实混凝土 模板侧压力 

分 类 号：TU528.041[建筑科学—建筑技术科学]