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含不同掺量矿渣或粉煤灰的复合胶凝材料的水化动力学
作者:韩方晖1 王栋民1 阎培渝2 
单位:1.中国矿业大学北京化学与环境工程学院 北京 100083 2.清华大学土木工程系 土木工程安全与耐久教育部重点实验室 北京 100084 
关键词:复合胶凝材料 矿渣 粉煤灰 动力学 水化度 水化速率 
分类号:TU528.042.2
出版年,卷(期):页码:2014,42(5):613-620
DOI:10.7521/j.issn.0454-5648.2014.05.10
摘要:

采用等温量热法测定了矿渣掺量分别为030%50%70%90%和粉煤灰掺量分别为020%35%50%65%的复合胶凝材料在298K时的水化放热速率和放热量。根据水化动力学模型计算了反应速率常数、几何晶体生长指数等动力学参数,并讨论了水化反应各阶段的反应速率与反应度的关系。结果表明:不同矿渣掺量和不同粉煤灰掺量的复合胶凝材料的水化过程均可表示为结晶成核与晶体生长、相边界反应和扩散3个阶段。所用动力学模型能较好地表征矿渣掺量在70%以内及粉煤灰掺量在65%以内的复合胶凝材料的真实水化过程。矿渣掺量90%的复合胶凝材料的水化机理发生了改变,所用动力学模型不再适用。

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Hydration heat emission rate and quantity of cement-slag blends containing 0,30%, 50%, 70% and 90% of slag and that of cement-fly ash blends containing 0, 20%, 35%, 50%, 65% of fly ash were measured at 298K using isothermal calorimetry. According to the hydration kinetics model, the reaction rate constant, the geometrical crystal growth exponent, n, and other kinetic parameters were calculated. The relationship between the hydration rate and the degree of hydration was discussed at different stages of hydration. The hydration process of composite binders can involve three stages, i.e., nucleation and crystal growth, interactions at phase boundaries and diffusion. The kinetic model was used to predict the hydration process of composite binder containing no more than 70% of slag and composite binder containing no more than 65% of fly ash. This model is no longer applicable for composite binder containing 90% of slag due to the variation of its hydration mechanism.

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基金项目:
自然科学基金-广东省联合资助重点项目(No.U1134008);国家自然科学基金面上项目(No.51278277)。
作者简介:
第一作者:韩方晖(1988—),女,博士研究生。E-mail: hanyang-1120@163.com 通信作者:阎培渝(1955—),男,博士,教授。E-mail: yanpy@tsinghua.edu.cn
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