材料科学
煅烧
动力学
熟料(水泥)
矿物学
活化能
等温过程
高岭石
硅酸盐水泥
波特兰岩
吸附
溶解
偏高岭土
作者
Sebastian Scherb,Matthias Maier,Nancy Beuntner,Karl-Christian Thienel,Jürgen Neubauer
标识
DOI:10.1016/j.cemconres.2021.106382
摘要
Abstract Investigations of nearly pure, calcined phyllosilicates (“meta-phyllosilicates”) in clinker-free model systems were performed in presence and absence of sulfate. Calorimetric investigations show a pronounced reaction during the early reaction period only for metakaolin. Quantitative in situ X-ray diffraction reveals calcium silicate hydrate formation in the systems with metakaolin and metaillite, but not in those with metamuscovite. Ettringite crystallizes in all systems containing sulfate, where only the metakaolin system reaches the maximum ettringite content possible. The amount of aluminum ions released from 2:1 meta-phyllosilicates seems to be insufficient to reach the maximum content. Differences in portlandite dissolution and bound water indicate adsorption effects of calcium or calcium – sulfate ion pair complexes on surfaces of the calcined clay particles. Thus, the chemical as well as the physical influence of the meta-phyllosilicates must be considered to predict the reaction kinetics of calcined clays during early hydration.
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