粉煤灰在蒸养条件下的氯离子固化性能  

Chloride Binding Ability of Fly Ash Under Steam Curing Condition

作　　者：李东[1] 张济涛 耿健[2] 申世贵 LI Dong;ZHANG Jitao;GENG Jian;SHEN Shigui(Department of Civil Engineering,Shanghai University,Shanghai 200444,China;Ningbo Institute of Technology,Zhejiang University,Ningbo 315100,China)

机构地区：[1]上海大学土木工程系,上海200444 [2]浙江大学宁波理工学院,浙江宁波315100

出　　处：《材料科学与工程学报》2021年第3期373-377,共5页Journal of Materials Science and Engineering

基　　金：国家自然科学基金资助项目(51778578);浙江省自然科学基金资助项目(Y17E080072)。

摘　　要：通过模拟粉煤灰在硅酸盐水泥中的水化环境,采用二次等温吸附法研究了标准养护和蒸汽养护条件下粉煤灰水泥体系中粉煤灰氯离子固化能力的变化,采用灰色关联分析法对实验结果进行了分析。研究结果表明:粉煤灰氯离子化学结合能力随恒温温度和恒温时间的增加而降低,而物理吸附能力基本不变;在标准养护条件下粉煤灰水化生成的铝酸盐是C_(4)AH_(13),而在蒸汽养护条件下是C_(3)AH_(6),C_(3)AH_(6)氯离子固化能力相对较弱,使得蒸养条件下的粉煤灰氯离子固化能力小于标准养护条件;当以氯离子固化总量为参考数列时,蒸汽养护制度中恒温温度的影响大于恒温时间。By simulating the hydration environment of fly ash in port land cement,the secondary isotherm adsorption method was used to study the difference of chloride binding capacity of fly ash between standard curing and steam curing conditions,and the experimental results were analyzed through grey correlation analysis(GRA)method.The results indicates that the chloride chemically binding capacity of fly ash decreases with the increases of isothermal temperature and isothermal time,while the physically adsorption capacity is basically unchanged;Compared with the hydration product aluminate C_(4)AH_(13) under standard curing conditions,the hydration product of fly ash under steam curing condition is aluminate C_(3)AH_(6),and its chloride binding capacity is weaker,leading to the chloride binding capacity of fly ash under the steam curing condition less than that under the standard curing condition.When the total binding amount of chloride is taken as a reference,the influence degree of isothermal temperature is greater than isothermal time.

关 键 词：蒸汽养护 氯离子固化 粉煤灰 水化铝酸三钙 灰色关联度 

分 类 号：TU528[建筑科学—建筑技术科学]