Abstract Much is unknown about the reaction processes responsible for the formation and polycondensation of geopolymers and other alkali activated materials. In this work, isothermal calorimeter and in-situ XRD were adopted to study the heat and mineral evolution of NaOH activated fly ash, metakaolin and ground granulated blast furnace slag. Both activator concentration and temperature have profound influences on duration of exothermal geopolymerization peaks. NaOH activated fly ash is more temperature dependable, with much higher activation energy than metakaolin and slag. The dissolution of source precursor is rapid and the formation of new phases can be detected by the end of the initial dissolution period. The in-situ XRD measurement together with the PONKCS analysis method promotes quantitative estimation of amorphous evolution during alkali activation.

中文翻译：

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NaOH 活化粉煤灰、偏高岭土和炉渣的等温量热法和原位 XRD 研究

摘要 关于导致地质聚合物和其他碱活化材料的形成和缩聚的反应过程尚不清楚。在这项工作中，采用等温量热仪和原位 XRD 来研究 NaOH 活化的粉煤灰、偏高岭土和磨碎的粒状高炉矿渣的热量和矿物演化。活化剂浓度和温度对放热地质聚合峰的持续时间都有深远的影响。NaOH 活化的粉煤灰温度更可靠，活化能比偏高岭土和炉渣高得多。源前体的溶解很快，在初始溶解期结束时可以检测到新相的形成。