Composition, silicate anion structure and morphology of calcium silicate hydrates (C-S-H) synthesised by silica-lime reaction and by controlled hydration of tricalcium silicate (C3S)
Composition, silicate anion structure and morphology of calcium silicate hydrates (C-S-H) synthesised by silica-lime reaction and by controlled hydration of tricalcium silicate (C3S)
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DOI：
10.1179/1743676115y.0000000038
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发表时间：
2015-10
影响因子：
2.2
通讯作者：
E. T. Rodriguez;I. Richardson;L. Black;E. Boehm-Courjault;A. Nonat;J. Skibsted
中科院分区：
文献类型：
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作者：
E. T. Rodriguez;I. Richardson;L. Black;E. Boehm-Courjault;A. Nonat;J. Skibsted
波特兰水泥水化的主要产物是C-S-H。尽管构成超过一半的体积的水化浆体，并具有重要的作用，在强度的发展，很少有人知道的因素，决定其形态。为了研究C-S-H的化学组成、硅酸盐阴离子结构和形态之间的关系，通过二氧化硅-石灰反应和在控制的石灰浓度和有/没有促进剂的情况下通过C3 S的水合来合成样品。用29 Si魔角自旋核磁共振谱研究了样品的硅酸盐阴离子结构，用透射电镜和扫描电镜研究了样品的形貌和化学组成。通过二氧化硅-石灰反应制备的所有样品与本体Ca/Si高达1.5的箔状。当[CaO]为22 mmol L−1时，C3 S在固定石灰浓度下的水合作用产生箔状C-S-H。在加速剂的作用下，发现了硅酸盐阴离子结构与C-S-H形貌之间的关系。
The main product of Portland cement hydration is C-S-H. Despite constituting more than half of the volume of hydrated pastes and having an important role in strength development, very little is known about the factors that determine its morphology. To investigate the relationship between the chemical composition, silicate anion structure and morphology of C-S-H, samples were synthesised via silica-lime reactions and by the hydration of C3S under controlled lime concentrations and with/without accelerators. The silicate anion structure of the samples was studied by 29Si magic angle spinning nuclear magnetic resonance spectroscopy and the morphology and chemical composition by TEM and SEM. All samples prepared via silica-lime reactions with bulk Ca/Si up to 1.5 were foil-like. The hydration of C3S at fixed lime concentration yielded foil-like C-S-H for [CaO]22 mmol L−1. A relationship between the silicate anion structure and the morphology of C-S-H was found for the samples fabricated with accelerators.