本文以实验数据为基础，利用“Jander”动力学方程，借助现代分析手段，对粉煤灰地聚物反应体系下的反应动力学进行了研究。主要研究内容有：液固比对粉煤灰在强碱体系下反应过程的影响；粉煤灰在地聚物体系下反应动力学阶段的划分；温度及碱浓度对动力学各反应阶段的影响以及地聚物宏观强度产生的机理等。研究结果表明：液固比的降低会造成反应速率的下降，固相产物形成所需的反应程度提前及反应产物形态的变化；地聚物反应过程以动力学方程模型中N＝2和N＞2以扩散反应阶段为主；温度的升高在提高各阶段反应速率的同时可降低反应时长。碱浓度的升高可有效提高各阶段的反应速率。粉煤灰主体与反应产物在化学成分上的明显差异与地聚物反应过程及其宏观强度的形成有密切关联。
In this paper , based on the experimental data , with the help of "Jander"kinetic equation and modern analytical methods , the reaction kinetics of fly ash geopolymer system were studied .The research content include:the effect of liquid-solid ratio on the reaction process , the reaction kinetics stage of fly ash based geopolymer , the effects of temperature and alkali concentration on the each reaction kinetics stage and generating mechanism of compressive strength .The results show that:Reducing liquid-solid ratio will cause a decline in the reaction rate , promote the formation of solid products and the structure change of reaction products .The main reaction kinetics stage belong to diffusion reaction stage ( model N=2 and N>2).Increasing temperature can improve each reaction rate and at same time reduce stage duration of each kinetics stage .Higher alkali concentration could effectively increase the reaction rate of each kinetics stage.The difference of chemical composition between fly ash particles and reaction produces is related to the geopolymer reaction process and the formation of compressive strength .
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