任 旭1,2,张秀贞1,2,刘志超1,2,何永佳1,2,胡曙光1,2,曾 波3
任旭,张秀贞,刘志超,等.多元胶凝材料水化热动力学研究[J].混凝土与水泥制品,2021(6):13-18.
REN X,ZHANG X Z,LIU Z C,et al.Study on Hydration Thermodynamics and Kinetics of Multiple Cementitious Materials[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(6):13-18.
多元胶凝材料水化热动力学研究
任 旭1,2,张秀贞1,2,刘志超1,2,何永佳1,2,胡曙光1,2,曾 波3
任旭,张秀贞,刘志超,等.多元胶凝材料水化热动力学研究[J].混凝土与水泥制品,2021(6):13-18.
REN X,ZHANG X Z,LIU Z C,et al.Study on Hydration Thermodynamics and Kinetics of Multiple Cementitious Materials[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(6):13-18.
摘 要:采用等温量热法测定了不同体系的多元胶凝材料水化放热速率和累计放热量,分析了矿物掺合料、温度和早强剂对胶凝材料水化放热过程的影响。基于Krstulovic-Dabic水化动力学模型计算了总放热量、水化时间和反应速率常数等动力学参数,讨论了不同体系胶凝材料水化反应各阶段的反应速率与反应程度的关系。结果表明:水泥、水泥-矿渣多元胶凝材料和水泥-粉煤灰多元胶凝材料的水化动力学过程可分为结晶成核与晶体生长(NG)、相边界反应(I)和扩散(D)3个阶段;在高温下和添加早强剂条件下,多元胶凝材料的水化动力学过程控制阶段为结晶成核与晶体生长(NG)和扩散(D)2个阶段。
Abstract: Hydration heat emission rate and cumulative hydration heat of different cementitious material were measured by isothermal calorimetry, and the effects of mineral admixtures, temperature and hardening accelerator on the hydration process of cementitious materials were analyzed. Based on the Krstulovic-Dabic hydration kinetic model, the kinetic parameters such as total hydration heat, hydration time and reaction rate constant were calculated, and the relationship between the reaction rate and the degree of hydration was discussed. The results show that the hydration kinetics of cement, cement-slag binder and cement-fly ash binder can be divided into 3 stages (NG, I and D), and the hydration kinetics of multiple cementitious materials under high temperature and hardening accelerator can be controled by 2 stages (NG and D).
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