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Received November 2, 2006
Accepted June 11, 2007
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Characterization of fly ash-pastes synthesized at different activator conditions
Division of Civil and Environmental Engineering, Sunchon National University, Sunchon 540-742, Korea 1Department of Civil and Environment, Hanyeong Technical College, Yeosu 550-704, Korea
Korean Journal of Chemical Engineering, January 2008, 25(1), 78-83(6), 10.1007/s11814-008-0013-6
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Abstract
Compressive strength and mineralogical and microstructural characterization of the pastes prepared from alkali-activation of low calcium fly ash were investigated. XRD and FTIR were used to observe the mineralogical characterization; SEM, MIP, and NMR were used to observe the microstructural characterization of the pastes. The higher strength of paste was attributed to a more compact and continuous gelatinous matrix due to restructuring of reaction product. The lower values of both porosity (31.0%) and mean pore diameter (9.7 nm) of fly ash-pastes alkali-activated at 85 ℃ for 24 hr indicate higher reactivity of these pastes compared with other pastes, and result in the higher compressive strength.
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Zhaohui X, Yunping X, Cem. Concr. Res., 31, 1245 (2001)
Hossein R, William B, Environ. Sci. Technol., 37, 3454 (2003)
Samdi A, PhD dissertation of Drexel University, Treatment of fly ash to increase its cementitious characteristics, Philadelphia, PA (1996)
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VanJaarsveld JGS, VanDeventer JSJ, Lorenzen L, Miner. Eng., 10(7), 659 (1997)
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Palomo A, Grutzeck MW, Blanco MT, Cem. Concr. Res., 29, 1323 (1999)
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Barbosa VFF, MacKenzie KJD, Thaumaturgo C, Int. J. Inorg. Mater., 2, 309 (2000)
Richardson IG, Brough AR, Groves GW, Dobson CM, Cem. Concr. Res., 24, 813 (1994)
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Palomo A, Lopez de la Fuente JI, Cem. Concr. Res., 33, 281 (2003)
