硅酸钠
氢氧化钠
等温过程
材料科学
化学工程
微观结构
动力学
诱导期
硅酸盐
等温滴定量热法
碱金属
无机化学
冶金
化学
热力学
物理化学
有机化学
物理
量子力学
工程类
作者
Berhan Seium Gebregziabiher,Robert J. Thomas,Sulapha Peethamparan
标识
DOI:10.1016/j.cemconcomp.2014.09.001
摘要
The early age reaction kinetics and microstructural development in alkali-activated slag binder are discussed. In-situ isothermal calorimetry was used to characterize the reaction progression in sodium hydroxide and sodium silicate-activated slag binders cured at ambient temperature. Microstructure and strength development were monitored to correlate the heat evolution with the property development. In-situ isothermal calorimetric data for sodium hydroxide-activated systems exhibited only one major heat evolution peak with no dormant period. Sodium silicate-activated pastes exhibited multiple peaks and extended dormant periods. Microstructural evolution, monitored using BSE–SEM, showed rapid product formation on the surface of slag grains in sodium hydroxide-activated systems, forming thin reaction shells—the thickness of which was related to the activator concentration—and leading to diffusion controlled hydration at a very early stage. Sodium silicate-activated systems exhibited slow and progressive product formation, predominately nucleated from the solution. These results are supported by electron mapping and electron dispersive X-ray spectroscopy.
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