流变参数对自密实混凝土等效砂浆静态稳定性的影响

发布时间：2018-06-09 06:15

本文选题：自密实混凝土 + 混凝土等效砂浆　；参考：《硅酸盐学报》2017年02期

【摘要】：采用旋转黏度计测试了基于混凝土等效砂浆法所配制砂浆的塑性黏度和触变性,采用冲模揭板试验研究了不同塑性黏度和触变性的砂浆硬化后表面的气泡特点,采用硬化后砂浆表层气泡率和表层气泡直径对砂浆的静态稳定性进行了表征。结果表明:塑性黏度和触变性对硬化后砂浆表层气泡率和直径均有重要影响。相对于触变性,塑性黏度与砂浆表层气泡率和直径的相关性更高。砂浆表层气泡率和气泡直径均随黏度增大而显著减少,砂浆黏度不低于3.5 Pa·s时,表层气泡率小于5%,直径大于5 mm的气泡数量接近零。砂浆表层气泡率随触变性增加而减少,砂浆触变性不低于12.5×10~3 Pa/s时,砂浆表层气泡率基本小于10%。当砂浆塑性黏度不低于3.5 Pa·s且触变性不低于12.5×10~3 Pa/s时,其静态稳定性较好。
[Abstract]:The plastic viscosity and thixotropy of mortar prepared by the equivalent concrete mortar method were measured by rotary viscometer. The bubble characteristics of hardened mortar with different plastic viscosity and thixotropy were studied by punching die uncovering test. The static stability of hardened mortar was characterized by surface bubble rate and bubble diameter. The results show that the plastic viscosity and thixotropy have an important effect on the bubble rate and diameter of the hardened mortar. Compared with thixotropy, the relationship between plastic viscosity and bubble rate and diameter of mortar surface is higher. The bubble rate and bubble diameter in the surface layer of mortar decrease significantly with the increase of viscosity. When the viscosity of mortar is not less than 3.5 Pa / s, the bubble rate of surface layer is less than 5 and the number of bubbles larger than 5 mm is close to zero. The bubble rate decreases with increasing thixotropy. When the thixotropy of mortar is not less than 12.5 脳 10 ~ (3) Pa / s, the bubble rate of mortar surface layer is less than 10 ~ (3). When the plastic viscosity of the mortar is not less than 3.5 Pa / s and the thixotropy is not less than 12.5 脳 10 ~ (-3) Pas, the static stability of the mortar is better.
【作者单位】：中南大学土木工程学院高速铁路建造技术国家工程实验室重载铁路工程结构教育部重点实验室;
【基金】：国家自然科学基金(51678569,51678568) 国家“973”计划(2013CB036201) 中南大学教师科学基金(2014JSJJ013)资助
【分类号】：TU578.1

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