硅酸盐学报2017，Vol.45Issue(2)：196-205,10.DOI:10.14062/j.issn.0454-5648.2017.02.04
流变参数对自密实混凝土等效砂浆静态稳定性的影响
Influence of Rheological Parameters on Static Stability of Self-Compacting Concrete Equivalent Mortar
摘要
Abstract
The plastic viscosity and thixotropy of self-compacting concrete equivalent mortar (SCCEM) were tested by rotational viscometer. The surface bubbles characteristics of mortar with different plastic viscosities and thixotropies were investigated by a self-designed filling-box device. Two parameters of surface bubbles ratio (SBR) and surface bubble diameter (SBD) of hardened mortar were used to characterize the static stability of mortar. The results show that the plastic viscosity and thixotropy both have great influences on SBR and SBD. Compared to the thixotropy, the correlation between the plastic viscosity and SBR/SBD is better. SBR and SBD of mortar decrease dramatically with the increasing plastic viscosity. When plastic viscosity is no less than 3.5 Pa·s, SBR is less than 5% and SBD larger than 5 mm is close to zero. SBR of mortar reduces with the increasing thixotropy. SBR is almost less than 10% when the thixotropy of fresh mortar is more than 12.5×103Pa/s. When the plastic viscosity is more than 3.5 Pa·s and the thixotropy of fresh mortar is more than 12.5×103Pa/s, SCCEM has a good static stability.关键词
自密实混凝土/混凝土等效砂浆/塑性黏度/触变性/静态稳定性Key words
self-compacting concrete equivalent mortar/plastic viscosity/thixotropy/static stability分类
建筑与水利引用本文复制引用
马昆林,冯金,龙广成,谢友均,陈小波..流变参数对自密实混凝土等效砂浆静态稳定性的影响[J].硅酸盐学报,2017,45(2):196-205,10.基金项目
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。 （51678569，51678568）
