含不同形态硅灰的复合胶凝材料浆体的流变学特性(英文)

Rheological Properties of Composite Binder Paste Containing Different Types of Silica Fume

通过流变度和坍落度测试,研究了原状硅灰和加密硅灰对水灰比为0.25和0.30的复合胶凝材料的流变性能的影响。结果表明:初始测量中,加密硅灰(0~12%)使净浆屈服应力从0~5 Pa增加到20~60 Pa,塑性黏度从1 500 mPa·s增大到3 200 mPa·s;原状硅灰的掺加(0~12%)使净浆的屈服应力基本维持在0~8 Pa,塑性黏度在1 500~2 000 mPa·s。加密硅灰可以增大复合胶凝材料浆体的屈服应力和塑性黏度,原状硅灰则能在一定时间内使复合胶凝材料浆体保持相同的流变性。无论含有何种形态的硅灰,复合胶凝材料浆体的屈服应力和扩展度之间均呈线性关系,相关系数达到R^2=0.911 16。

The rheological properties of composition binder pastes with raw silica fume and condensed silica fume at water to binder ratios of 0.25 and 0.30 were investigated by rheometry and mini slump cone measurement. The results show that composite binder paste with condensed silica fume （0-12%） has a greater yield stress from 0-5 Pa to 20-60 Pa, and a higher plastic viscosity from 1 500 mPa·s to 3 200 mPa·s. The paste with raw silica fume （0-12% addition） has the yield stress of 0-8 Pa and the plastic viscosity of 1 500-2 000 mPa·s. It is indicated that CSF increases the yield stress and plastic viscosity of pastes, RSF has the constant yield stress and plastic viscosity of pastes and an effect on the rheological properties. In addition, a liner relationship between yield stress and slump flow of the pastes with different types of silica fume was also proposed, and the correlation index is R2=0.911 16.