摘要
以差示扫描量热法为手段,进行了水化硅酸盐水泥浆体热分析动力学的研究.采用Kim-Park,Flynn-Wall-Ozawa和Friedman法计算了升温过程水泥浆体各阶段吸热反应活化能和反应级数.结果表明:升温过程中水泥浆体呈现3个吸热反应阶段,随温度升高各反应阶段活化能逐渐升高;Kim-Park,Flynn-Wall-Ozawa和Friedman三种方法较好地分析了前2个反应阶段的反应活化能和反应级数,第一阶段的反应活化能小于第二阶段,但反应级数n却大于后者;对于前2个吸热反应阶段,Kim-Park和Flynn-Wall-Ozawa均能较好地进行动力学分析,但Friedman法对于第三阶段即C-S-H发生脱水过程的反应活化能计算误差较大.
The kinetics of thermal analysis of hydrated cement pastes were investigated by differential scanning calorimeter（DSC） analysis in nitrogen.During the temperature-rise period the activation energy and reaction orders of pastes were calculated by Kim-Park,Flynn-Wall-Ozawa and Friedman methods.The results show that three endothermic reaction stages appear during the temperature-rise period and their activation energy increase when the temperature gradually increases.The activation energy and reaction orders of first two reaction stages are analyzed by Kim-Park,Flynn-Wall-Ozawa and Friedman methods.The activation energy of the first reaction stage is less than the second stage,but the reaction order n is greater than the latter.The first two endothermic reaction stages can be better analyzed by Kim-Park and Flynn-Wall-Ozawa methods.For the third endothermic reaction stage the calculation error of activation energy is bigger when Friedman method is adopted.
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2011年第3期601-605,共5页
Journal of Southeast University：Natural Science Edition
基金
国家重点基础研究发展计划(973计划)资助项目(2009CB623200)
关键词
硅酸盐水泥浆体
差示扫描量热法
热分析动力学
活化能
Portland cement paste
differential scanning calorimeter
thermal analysis kinetics
activation energy
作者简介
作者简介：何小芳（1980-），女，博士生；
缪昌文（联系人），男，博士，教授，博士生导师，mcw@cnjsjk．cn．
