摘要
采用RHEOLABQC型旋转黏度计,以剪切速率恒定的方式测试了水泥石灰石粉浆体的静态屈服应力、结构建立速率与塑性应变能,研究了不同温度下石灰石粉对新拌水泥浆体结构建立的影响.结果表明:当剪切速率为0.1s^-1时,水泥石灰石粉浆体表现为黏弹性流体,石灰石粉对水泥浆体结构建立的影响与温度有关,浆体静态屈服应力在20℃时随石灰石粉掺量增加而增大,在5,10,30℃时则受石灰石粉掺量的影响较小;浆体结构建立速率在20,30℃时随石灰石粉掺量增加而先增大后减小,并在石灰石粉掺量为10%时达到最大值,在5,10℃时则基本不受石灰石粉掺量的影响;浆体的塑性应变能在5,10,20℃时随石灰石粉掺量增加而增大,但在30℃时基本不变;而当石灰石粉掺量相同时,浆体塑性应变能随温度的升高先增大后降低,并在10℃时达到峰值.
The rheology of cement-ground limestone pastes was tested at a constant shear rate by means of RHEOLAB QC rotating viscometer at various temperatures,and the static yield stress,structural build-up rate and plastic strain energy of pastes were measured to characterize the effect of temperatures on role of ground limestone in structural build-up of pastes. The results show that the cement-ground limestone paste is a viscoelastic fluid at shear rate of 0.1 s^-1 . The temperature affects the role of ground limestone in cement paste,with the increase of ground limestone content,the static yield stress of the paste increases at 20 ℃,but there is little effect at 5 ℃,10 ℃ and 30 ℃. At 20 ℃ and 30 ℃,the structural build-up rate increases first and then decreases with the increasing ground limestone content,and the structural build-up rate reaches the maximum when the ground limestone content is 10%,and the ground limestone content has no effect basically at 5 ℃ and 10 ℃. The plastic strain energy increases with increasing ground limestone content at 5 ℃,10 ℃,and 20 ℃,but it basically remains stable at 30 ℃. When the ground limestone content is the same,the plastic strain energy increases first and then decreases with the rise temperature and reaches the maximum at 10 ℃.
作者
肖佳
左胜浩
王大富
马文峰
彭扬轩
XIAO Jia;ZUO Shenghao;WANG Dafu;MA Wenfeng;PENG Yangxuan(School of Civil Engineering,Central South University,Changsha 410075,China;Communication and Signal Construction Corporation Limited,Changsha 410005,China)
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2019年第3期327-332,347,共7页
Journal of Building Materials
基金
国家自然科学基金资助项目(51278497)
关键词
温度
石灰石粉
黏弹性
静态屈服应力
结构建立
temperature
ground limestone
viscoelasticity
static yield stress
structural build-up
