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矿物掺合料对胶凝材料浆体流变性能和触变性的影响
作者:  黎梦圆 阎培渝 
单位:(清华大学土木工程系 城市轨道交通绿色与安全建造技术国家工程实验室 北京 100084) 
关键词:矿物掺合料 胶凝材料浆体 流变性能 触变性 Bingham模型 
分类号:TU528.041
出版年,卷(期):页码:2019,47(5):0-0
DOI:
摘要:

 基于大流态混凝土配合比,研究了各种矿物掺合料对胶凝材料浆体的流变性能和触变性的影响。结果表明:通过流变仪转速阶梯变化制度构建稳定的浆体流动状态,并利用转换方程可进行浆体流变性能参数的有效测量和计算。胶凝材料浆体的流变性能符合Bingham模型。粉煤灰和粉煤灰微珠均能降低浆体的屈服应力、塑性黏度和触变性,粉煤灰微珠作用效果更为明显;硅灰能增大浆体的屈服应力、塑性黏度和触变性;磨细矿渣粉会降低浆体的屈服应力和触变性,提高浆体的塑性黏度。在进行大流态混凝土配合比设计时应综合考虑矿物掺合料对新拌混凝土流变性能的影响。

 Effect of mineral admixtures on the rheological properties and thixotropy of binder paste was investigated based on a mix proportion for concrete with a high fluidity. Based on a stable flowing state of paste obtained through a stairstep schedule of rotation speed of rheometer and the transfer equation, the rheological data of binder paste were measured and calculated. The rheological characteristics of the binder paste follow the Bingham model. The results show that fly ash and fly ash microbeads both can reduce the yield stress, plastic viscosity and thixotopy of the paste, and the effect of fly ash microbeads is more obvious. The addition of silica fume can increase the yield stress, plastic viscosity and thixotopy of the paste. The addition of ground granulated blast furnace slag can reduce the yield stress and thixotropy, but increase the plastic viscosity of the paste. The effect of mineral admixtures could be considered synthetically during the design of mix proportion for concrete with a high fluidity.

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