期刊
CEMENT & CONCRETE COMPOSITES
卷 86, 期 -, 页码 1-8出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2017.11.004
关键词
Hot-press; Geopolymer; Thermal treatment; Reactivity; Characterization; Volcanic ash
资金
- National Elites Foundation of Iran
Hot-pressed curing of geopolymers introduces an efficient fabrication of almost pore-less and high strength binders with a minimum usage of alkali activator in an extremely short time. This study presents the dual effects of temperature and curing time on kinetics and mechanical properties of VA-based hot-pressing geopolymer. Moreover, the effects of elevated temperature on the aluminosilicate precursors dissolution and the pressure loss of the hot-pressed geopolymer are investigated. It is observed that increment in temperatures and time improves the dissolving trends of the aluminosilicates. Furthermore, pressure loss of the hot-pressing system is associated with the liquid phase removal and gelation of particles; and, a successive repressing of mixture to the initial condition reduces the porosity of the matrix significantly. The increase in curing temperature of the hot-pressing system is the key point in acceleration of the geopolymerization kinetic, however, curing time is essential in stabilization of the reaction. (C) 2017 Elsevier Ltd. All rights reserved.
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