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首先对膏体物料特性开展量化表征研究,通过分析膏体细观结构的物质组成,提出了一种全面描述物料特征的综合指标——固体填充率;开展膏体流变实验,基于宾汉模型对流变曲线进行拟合获得相应的屈服应力及塑性黏度,分析了体积分数、质量加权平均粒径、不均匀系数、细颗粒及水泥质量分数等因素对流变参数的影响规律,并从细观结构的角度对其影响机制进行了解释,最终构建了流变参数关于固体填充率的计算模型.研究结果表明:相同条件下,膏体屈服应力及塑性黏度随体积分数增大呈指数增大,随物料不均匀系数增大而减小,随细颗粒含量增大呈先减小再增大的变化趋势.
Firstly, the quantitative characterization of the paste material properties was studied. By analyzing the material composition of the meso-structure of the paste, a comprehensive index of the material characteristics was comprehensively put forward, that is solid filling rate. The paste rheological experiment was carried out. Based on the Bingham model The yield curves and plastic viscosities were fitted by fitting the rheological curves. The influences of volume fraction, mass weighted average particle diameter, non-uniform coefficient, fine particles and cement mass fraction on the rheological parameters were analyzed. The mechanism of influence was explained, and finally the calculation model of the rheological parameters on the solid filling rate was constructed.The results show that under the same conditions, the yield stress and the plastic viscosity of the paste increase exponentially with the increase of the volume fraction, The material nonuniformity coefficient increases and decreases, with the increase of fine particle content, it first decreases and then increases.