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三异丙醇胺-碳酸钠协同激发矿渣-粉煤灰体系的力学性能和水化历程
作者：张琰，刘华清，刘佳龙，孔森，董超
（中国电力科学研究院有限公司，北京 100192）
摘要：碳酸钠激发矿渣-粉煤灰体系是一种弱碱激发的低碳胶凝材料，与强碱激发胶凝材料相比，具有更低的碳排放，但其早期水化活性差、强度发展缓慢。提出了采用三异丙醇胺（TIPA）加速体系离子溶出，进而促进胶凝材料体系水化及强度发展的技术思路。通过抗压强度测试，研究了TIPA对碳酸钠激发矿渣-粉煤灰体系力学性能的影响规律；通过水化热测试，分析了该体系的水化动力学过程；通过XRD、TGA等测试手段，分析了水化产物特征；通过SEM观测了硬化浆体的微观形貌，并讨论了离子溶出与pH值的变化规律。结果表明，掺0.03%TIPA可显著促进矿渣-粉煤灰体系的离子溶出，加速水化，提高其早期强度。
关键词：碱激发胶凝材料；离子溶出；水化动力学；碳酸钠；三异丙醇胺
中图分类号：TU526 文献标识码：A 文章编号：1001-702X（2022）07-0104-06
Mechanical property and hydration kinetics of slag-fly ash blends activated with triisopropanolamine and sodium carbonate
ZHANG Yan，LIU Huaqing，LIU Jialong，KONG Sen，DONG Chao
（China Electric Power Research Institute Co. Ltd.，Beijing 100192，China）
Abstract：Sodium carbonate activated slag-fly ash is a low carbon cementitious material adopting weak alkali. In comparison with the cementitious material activated by strong alkali，it has lower carbon emission. However，its early hydration activity is poor，and its strength growth is also unsatisfactory. In this study，triisopropanolamine was used to accelerate the ion dissolution，and thus to promote the hydration kinetics and strength development of the system. Firstly，the influence of TIPA on the compressive strength of slag-fly ash system activated by sodium carbonate was studied. Then，the hydration kinetics of this system was examined by hydration heat test. Afterwards，the characteristics of hydration products were analyzed by XRD and TGA. Finally，the micro morphology of hardened paste was observed by SEM，and the ions concentration and pH value were also measured. Results shown that 0.03% TIPA could significantly promote the ion dissolution of the system; besides，the hydration kinetics was evidently facilitated，and the early strength was also improved.
Key words：alkali activated cementitious material，ions dissolution，hydration kinetics，sodium carbonate，triisopropanolamine