Influence of activator type on hydration kinetics, hydrate assemblage and microstructural development of alkali activated blast-furnace slags
Influence of activator type on hydration kinetics, hydrate assemblage and microstructural development of alkali activated blast-furnace slags
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DOI：
10.1016/j.cemconres.2010.11.016
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发表时间：
2011-03-01
影响因子：
11.4
通讯作者：
Lothenbach, B.
中科院分区：
文献类型：
--
作者：
Ben Haha, M.;Le Saout, G.;Lothenbach, B.
采用多种方法研究了氢氧化钠和水化偏硅酸钠(俗称水玻璃)对两种不同Al(2O)O(3)含量矿渣的水化作用。在所有体系中，主要水化产物为含铝C-S-H和镁铝比接近2的类水滑石相。氢氧化钠活化浆体中的C-S-H凝胶结晶度较高，水含量较少；在较长的水化时间内观察到钙含量相近的水化硅酸钙(C-S-H)和富钠C-N-S-H。用NaOH活化可获得较高的早期强度，但7天及以上的强度低于偏硅酸钠体系。在相同的渣反应程度下，C-S-H结构的巨大差异导致活化的氢氧化钠比偏硅酸钠活化的渣具有更粗的毛管孔隙率和更低的抗压强度。(C)2010爱思唯尔有限公司。保留所有权利。
The hydration of two slags with different Al(2)O(3) contents activated with sodium hydroxide and hydrous sodium metasilicate (commonly named water glass) is studied using a multi-method approach. In all systems, C-S-H incorporating aluminium and a hydrotalcite-like phase with Mg/Al ratio similar to 2 are the main hydration products. The C-S-H gels present in NaOH activated pastes are more crystalline and contain less water; a calcium silicate hydrate (C-S-H) and a sodium rich C-N-S-H with a similar Ca content are observed at longer hydration times. The activation using NaOH results in high early strength, but strength at 7 days and longer is lower than for the sodium metasilicate systems. The drastic difference in C-S-H structure leads to a coarser capillary porosity and to lower compressive strength for the NaOH activated than for the sodium metasilicate activated slags at the same degree of slag reaction. (C) 2010 Elsevier Ltd. All rights reserved.