期刊
CEMENT & CONCRETE COMPOSITES
卷 55, 期 -, 页码 91-102出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2014.09.001
关键词
Alkali activated slag; Mechanism; Microstructure; BSEM; In-situ isothermal calorimetry; Hydration
资金
- National Science Foundation (NSF) under CMMI Award [1055641]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1055641] Funding Source: National Science Foundation
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. (C) 2014 Elsevier Ltd. All rights reserved.
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