低剪切速率条件下温度对新拌水泥浆体结构的影响

发布时间：2018-06-17 14:16

  本文选题：低剪切速率 + 温度　； 参考：《建筑材料学报》2017年06期

【摘要】：采用RHEORIAB QC型旋转黏度计测定水泥浆体流变曲线,研究了低剪切速率条件下温度对新拌水泥浆体结构的影响.结果表明:水泥浆体弹性、塑性、黏性的区分及静态屈服应力与剪切速率有关,当恒定低剪切速率为0.1s-1时,通过水泥浆体的流变曲线能有效区分初始水泥浆体弹性、塑性、黏性阶段,可准确测试水泥浆体静态屈服应力,较好地反映水泥水化特征;温度升高,水泥浆体弹性、塑性和黏性增强,其初始静态屈服应力和储能模量增加,达到静态屈服应力的时间基本保持不变;随水泥浆体水化的进行,其剪切应力再次开始增加的时间随温度升高而线性减小,剪切应力及其增长速率随温度升高而增大.
[Abstract]:The rheological curves of cement paste were measured by RHEORIAB QC rotary viscometer. The effect of temperature on the structure of fresh cement paste was studied at low shear rate. The results show that the elasticity, plasticity, viscosity and static yield stress of cement paste are related to shear rate. When the shear rate is constant and low 0.1s-1, the initial cement paste elasticity and plasticity can be effectively distinguished by rheological curve of cement paste. In the viscous stage, the static yield stress of cement paste can be measured accurately, and the hydration characteristics of cement can be well reflected, the initial static yield stress and energy storage modulus increase with the increase of temperature, elasticity, plasticity and viscosity of cement paste. With the hydration of cement paste, the time when the shear stress begins to increase linearly decreases with the increase of temperature, and the shear stress and its growth rate increase with the increase of temperature.
【作者单位】： 中南大学土木工程学院;
【基金】：国家自然科学基金资助项目(51278497)
【分类号】：TU528
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本文编号：2031338