基于水泥净浆流变性的振动-剪切等效理论  

Vibration-shear equivalent theory based on rheological property of cement slurry

作　　者：李晓田[1] 谢广年 高竹锐 张声军 李军师 LI Xiao-tian;XIE Guang-nian;GAO Zhu-rui;ZHANG Sheng-jun;LI Jun-shi(School of Mechanical Engineering,Tongji University,Shanghai 201804,China)

机构地区：[1]同济大学机械与能源工程学院,上海201804

出　　处：《浙江大学学报（工学版）》2022年第7期1336-1341,共6页Journal of Zhejiang University：Engineering Science

基　　金：国家“十三五”重点研发计划资助项目(2017YFC0704004);山东省重点研发计划资助项目(2020CXGC011005).

摘　　要：为了分析振动条件下水泥净浆的流变特性,解释水泥净浆流变性模型的转化机制,提出适用于振动条件下水泥净浆流变性分析的振动-剪切等效理论.根据修正HI理论和回转黏度仪径向分层算法,计算振动条件下回转黏度仪内水泥净浆流场的剪切速率,将振动台正弦振动过程转化为对水泥净浆的剪切过程.采用自制回转黏度仪,开展20 Hz振动频率下的HI参数标定试验和30 Hz振动频率下的水泥净浆黏度试验.结果表明,HI参数标定结果与数值计算结果之间的误差约为7%,水泥净浆的试验黏度与数值计算的黏度之间的误差为8%并趋于收敛状态.增大振动频率,水泥净浆的黏度逐渐减小并达到峰值,流变性模型逐渐由Bingham模型转变为Hershel-Bulkley模型,最后转变为Power-Law模型.The transformation mechanism of the rheological model of cement slurry was explained in order to analyze the rheological properties of cement slurry under excitation.The vibration-shear equivalent theory was proposed for the rheological analysis of cement slurry under excitation.The shear rate of the flow field of cement paste in the rotary viscometer under the excitation condition was calculated according to the modified HI theory and the radial stratification algorithm of rotary viscometer.The sinusoidal vibration process of the shaking table was transformed into the shear process of cement paste.The HI parameter calibration test under the vibration frequency of 20 Hz and the viscosity test of cement paste under the vibration frequency of 30 Hz were conducted by using the self-made rotary viscometer.Results showed that the error between HI parameter calibration results and numerical calculation results was about 7%,and the error between test viscosity and numerical calculation viscosity of cement paste was 8%,which tended to converge.The viscosity of cement paste gradually decreased and reached a peak by increasing the vibration frequency.The rheological model gradually changed from Bingham model to Hershel-Bulkley model,which was transformed into Power-Law model.

关 键 词：水泥净浆 振动-剪切等效理论 流变特性 振动 HI理论 

分 类 号：TU528[建筑科学—建筑技术科学]