| 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01s-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. |
| 关键词: 低剪切速率 温度 浆体结构 时间 |
| DOI：103969/j.issn.1007 9629201706002 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(51278497) |
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| Influence of Temperature on Structure of Fresh Cement Paste with Low Shear Rate |
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XIAO Jia, WANG Dafu, ZUO Shenghao, WANG Jialei, LI Yun
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School of Civil Engineering, Central South University, Changsha 410075, China
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| Abstract: |
| The influences of temperature on structure of fresh cement paste with low shear rate were studied and the measurements of rheological curve were approached by means of the RHEORIAB QC type rotational viscometer. The results show that the distinction of elasticity, plasticity and viscosity of cement paste and the static yield stress depend on the shear rate, elasticity, plasticity and viscosity of cement pastes which can be effectively distinguished at the shearing rate of 01s-1. The increasing shear stress partly reflects the hydration of cement pastes. When temperature rises, elasticity, plasticity and viscosity of cement pastes increase, the initial static yield stress and storage modulus increase. Along with the hydration of cement pastes, when shear stress of cement pastes increases once again with the increase of temperature the time required will decrease linearly and both shear stress of cement pastes and their increasing rate increase with the rising temperature. |
| Key words: low shear rate temperature paste structure time |
