Mineralization dynamics of metakaolin-based alkali-activated cements
Mineralization dynamics of metakaolin-based alkali-activated cements
复制标题
DOI：
10.1016/j.cemconres.2017.01.001
复制
发表时间：
2017-04-01
影响因子：
11.4
通讯作者：
Srubar, Wil V., III
中科院分区：
文献类型：
--
作者：
Gevaudan, Juan Pablo;Campbell, Kate M.;Srubar, Wil V., III
本文研究了偏高岭土基碱激发水泥的早期矿物形成动力学。通过X射线衍射和固态29（Si）魔角旋转核磁共振谱，在2，7，14，和28天的硅的有效性和碱含量对矿物形成的影响进行了研究。通过使用液体（即时）或固体（逐步）硅酸钠补充剂来控制二氧化硅的可用性。矿物（沸石）和无定形微观结构特征与观察到的体积物理性质，即收缩，密度和孔隙率的变化。结果表明，虽然碱含量控制矿化立即可用的二氧化硅系统，碱含量控制二氧化硅的可用性逐渐可用的二氧化硅系统。直接二氧化硅的可用性通常导致更有利的矿物形成，如通过本体物理性质的相关改善所证明的。(C)2017爱思唯尔有限公司版权所有
This paper investigates the early-age dynamics of mineral formation in metakaolin-based alkali-activated cements. The effects of silica availability and alkali content on mineral formation were investigated via X-ray diffraction and solid-state 29(Si) magic-angle spinning nuclear magnetic resonance spectroscopy at 2, 7, 14, and 28 days. Silica availability was controlled by using either liquid- (immediate) or solid-based (gradual) sodium silicate supplements. Mineral (zeolitic) and amorphous microstructural characteristics were correlated with observed changes in bulk physical properties, namely shrinkage, density, and porosity. Results demonstrate that, while alkali content controls the mineralization in immediately available silica systems, alkali content controls the silica availability in gradually available silica systems. Immediate silica availability generally leads to a more favorable mineral formation as demonstrated by correlated improvements in bulk physical properties. (C) 2017 Elsevier Ltd. All rights reserved.