Characterization of fly ash-pastes synthesized at different activator conditions

Sang-Sook Park; Hwa-Young Kang

Korean Journal of Chemical Engineering, Vol.25, No.1, 78-83, January, 2008

DOI10.1007/s11814-008-0013-6 Export Citation

Characterization of fly ash-pastes synthesized at different activator conditions

Sang-Sook Park, and Hwa-Young Kang^{1, †}

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

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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.

Keywords:Fly Ash;Alkali Activation;Microstructure;Mercury Porosimetry

[References]

Li D, Xu Z, Luo Z, Pan Z, Cheng L, Cem. Concr. Compos., 32, 1145 (2002)
Guerrero A, Goni S, Macias A, Luxan MP, J. Mater. Res., 14, 2680 (1999)
Fernandez-Jimenez A, Palomo A, Cem. Concr. Res., 35, 1984 (2005)
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)
Arjunan P, Silsbee MR, Roy DM, Chemical activation of low calcium fly ash: Part: Identification of the most appropriate activators and their dosage, Proceedings of the Intl. Ash Utilization Symposium, Kentucky (2001)
VanJaarsveld JGS, VanDeventer JSJ, Lorenzen L, Miner. Eng., 10(7), 659 (1997)
Davidovits, J. Mater. Eng., 16, 91 (1994)
Palomo A, Grutzeck MW, Blanco MT, Cem. Concr. Res., 29, 1323 (1999)
Park SS, Kang HY, Korean J. Chem. Eng., 23(3), 367 (2006)
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)
Puertas F, Fernandez-Jimenez A, Cem. Concr. Compos., 25, 287 (2003)
Engelhardt G, Michel D, High resolution solid state NMR of silicates and zeolites, Wiley (1987)
Skibsted J, Henderson E, Jakobsen HJ, Inorg. Chem., 32, 1013 (1993)
Andersen MD, Jakobsen HJ, Skibsted J, Inorg. Chem., 42(7), 2280 (2003)
Palomo A, Lopez de la Fuente JI, Cem. Concr. Res., 33, 281 (2003)

[Referenced By]

[1] Li D, Xu Z, Luo Z, Pan Z, Cheng L, Cem. Concr. Compos., 32, 1145 (2002)

[2] Guerrero A, Goni S, Macias A, Luxan MP, J. Mater. Res., 14, 2680 (1999)

[3] Fernandez-Jimenez A, Palomo A, Cem. Concr. Res., 35, 1984 (2005)

[4] Zhaohui X, Yunping X, Cem. Concr. Res., 31, 1245 (2001)

[5] Hossein R, William B, Environ. Sci. Technol., 37, 3454 (2003)

[6] Samdi A, PhD dissertation of Drexel University, Treatment of fly ash to increase its cementitious characteristics, Philadelphia, PA (1996)

[7] Arjunan P, Silsbee MR, Roy DM, Chemical activation of low calcium fly ash: Part: Identification of the most appropriate activators and their dosage, Proceedings of the Intl. Ash Utilization Symposium, Kentucky (2001)

[8] VanJaarsveld JGS, VanDeventer JSJ, Lorenzen L, Miner. Eng., 10(7), 659 (1997)

[9] Davidovits, J. Mater. Eng., 16, 91 (1994)

[10] Palomo A, Grutzeck MW, Blanco MT, Cem. Concr. Res., 29, 1323 (1999)

[11] Park SS, Kang HY, Korean J. Chem. Eng., 23(3), 367 (2006)

[12] Barbosa VFF, MacKenzie KJD, Thaumaturgo C, Int. J. Inorg. Mater., 2, 309 (2000)

[13] Richardson IG, Brough AR, Groves GW, Dobson CM, Cem. Concr. Res., 24, 813 (1994)

[14] Puertas F, Fernandez-Jimenez A, Cem. Concr. Compos., 25, 287 (2003)

[15] Engelhardt G, Michel D, High resolution solid state NMR of silicates and zeolites, Wiley (1987)

[16] Skibsted J, Henderson E, Jakobsen HJ, Inorg. Chem., 32, 1013 (1993)

[17] Andersen MD, Jakobsen HJ, Skibsted J, Inorg. Chem., 42(7), 2280 (2003)

[18] Palomo A, Lopez de la Fuente JI, Cem. Concr. Res., 33, 281 (2003)