TY - JOUR
T1 - Effects of curing temperature and NaOH addition on hydration and strength development of clinker-free CKD-fly ash binders
AU - Wang, Kejin
AU - Shah, Surendra P.
AU - Mishulovich, Alexander
PY - 2004/2/1
Y1 - 2004/2/1
N2 - Effects of curing temperature and NaOH addition on hydration and strength development of cement kiln dust (CKD)-fly ash (FA) binders were investigated. Pastes made with 50% CKD and 50% FA, having 0, 2, and 5% NaOH addition, and cured at temperatures of 24, 38, and 50 °C were evaluated. The hydration products of the binders were examined by thermogravimetric analysis (TGA) and X-ray diffraction (XRD) tests. The results indicate that the major crystalline hydration product of the CKD-FA binders is ettringite, and the ettringite is stable in the CKD-FA system at age over 100 days. Curing at elevated temperature is more effective for CKD-FA binder strength improvement than NaOH addition, the later often depressing ettringite formation in a CKD-FA system. At a proper curing temperature (38 °C), addition of a small amount of NaOH (2%) may increase CKD-FA binder strength; while at a high curing temperature (50 °C), addition of NaOH (2%) may reduce the binder strength.
AB - Effects of curing temperature and NaOH addition on hydration and strength development of cement kiln dust (CKD)-fly ash (FA) binders were investigated. Pastes made with 50% CKD and 50% FA, having 0, 2, and 5% NaOH addition, and cured at temperatures of 24, 38, and 50 °C were evaluated. The hydration products of the binders were examined by thermogravimetric analysis (TGA) and X-ray diffraction (XRD) tests. The results indicate that the major crystalline hydration product of the CKD-FA binders is ettringite, and the ettringite is stable in the CKD-FA system at age over 100 days. Curing at elevated temperature is more effective for CKD-FA binder strength improvement than NaOH addition, the later often depressing ettringite formation in a CKD-FA system. At a proper curing temperature (38 °C), addition of a small amount of NaOH (2%) may increase CKD-FA binder strength; while at a high curing temperature (50 °C), addition of NaOH (2%) may reduce the binder strength.
KW - Cement kiln dust
KW - Elevated curing temperature
KW - Fly ash
KW - NaOH addition
KW - Thermal analysis
KW - X-ray diffraction
KW - XRD
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U2 - 10.1016/j.cemconres.2003.08.003
DO - 10.1016/j.cemconres.2003.08.003
M3 - Article
AN - SCOPUS:0742272523
VL - 34
SP - 299
EP - 309
JO - Cement and Concrete Research
JF - Cement and Concrete Research
SN - 0008-8846
IS - 2
ER -