Influence of starting material on the early age hydration kinetics, microstructure and composition of binding gel in alkali activated binder systems
Influence of starting material on the early age hydration kinetics, microstructure and composition of binding gel in alkali activated binder systems
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DOI：
10.1016/j.cemconcomp.2013.11.010
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发表时间：
2014-04-01
影响因子：
10.5
通讯作者：
Peethamparan, Sulapha
中科院分区：
文献类型：
--
作者：
Deir, Elisabeth;Gebregziabiher, Berhan S.;Peethamparan, Sulapha
研究了原料对碱激发胶凝材料水化动力学和胶凝凝胶组成的影响。所用的起始材料是经研磨的粒化高炉矿渣、C级粉煤灰和F级粉煤灰。使用SiO2/Na 2 O比为1.5的碱性溶液活化所有起始材料。水化动力学进行了监测，使用原位等温传导量热法和粘合剂凝胶的化学组成进行了测定，通过能量色散X-射线光谱。在粉煤灰体系中，量热曲线只有一个峰，发生在反应的前30分钟，没有诱导期。两个峰值是可区分的渣系统，虽然诱导期是远远短于一个典型的OPC系统。凝胶组成比，包括Ca/Si，Na/Si，Na/Al和Al/Si，在每个系统中是不同的，并进行了详细讨论。(C)2013爱思唯尔有限公司保留所有权利。
The influence of starting material on the hydration kinetics and composition of binding gel in alkali activated binder systems was evaluated. The starting materials used were ground granulated blast furnace slag, class C fly ash and class F fly ash. All starting materials were activated using alkaline solution with a SiO2/Na2O ratio of 1.5. The hydration kinetics were monitored using in situ isothermal conduction calorimetry and the chemical compositions of the binder gels were determined by energy dispersive X-ray spectroscopy. In the fly ash systems, the calorimetric curves had only one peak, which occurred in the first 30 min of reaction, and lacked an induction period. Two peaks were distinguishable in slag systems, though the induction period was much shorter than that of a typical OPC system. The gel composition ratios, including Ca/Si, Na/Si, Na/Al and Al/Si, were different in each of the systems and are discussed in detail. (C) 2013 Elsevier Ltd. All rights reserved.