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Development of Fly Ash/slag Cement Using Alkali-activated Reaction(2) - Reaction products and microstructure -  

Park, Sang-Sook (Division of Civil and Environmental Engineering, Sunchon National University)
Kang, Hwa-Young (Department of Civil and Environmental, Hanyeong College)
Han, Kwan-Su (Division of Civil and Environmental Engineering, Sunchon National University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.29, no.7, 2007 , pp. 810-819 More about this Journal
Abstract
Investigation of alkali activation of fly ash and blast furnace slag was carried out using waterglass and sodium hydroxide. XRD, FTIR, $^{29}Si$ and $^{27}Al$ NMR, TGA and SEM were used to observed the reaction products and microstructure of the fly ash/slag cement (FSC) pastes. The reaction products were amorphous or low-ordered calcium silicate hydrate and aluminosilicate gel produced from alkali activation of blast furnace slag and fly ash, respectively. On the basis of this investigation, waterglass solution with a modulus(Ms) of 1.0 and 1.2 is recommended for alkali activation of fly ash and blast furnace slag. Morphology of FSC pastes alkali-activated with Ms of 1.0 and 1.2 shows a more solid and continuous matrix due to restructuring of gel-like reaction products from alkali-activated fly ash and blast furnace slag together with another hydrolysis product(i.e., silica gel) from water glass.
Keywords
Alkali Activated; Fly Ash/Slag Cement; Microstructure; C-S-H Gel; Aluminosilicate Gel;
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Times Cited By KSCI : 1  (Citation Analysis)
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