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Compressive strength and microstructural characteristics of class C fly ash geopolymer
AbstractGeopolymers prepared from a class C fly ash (CFA) and a mixed alkali activator of sodium hydroxide and sodium silicate solution were investigated. A high compressive strength was obtained when the modulus of the activator viz., molar ratio of SiO2/Na2O was 1.5, and the proper content of this activator as evaluated by the mass proportion of Na2O to CFA was 10%. The compressive strength of these samples was 63.4MPa when they were cured at 75°C for 8h followed by curing at 23°C for 28d. In FTIR spectroscopy, the main peaks at 1036 and 1400cm−1 have been attributed to asymmetric stretching of Al–O/Si–O bonds, while those at 747cm−1 are due to the Si–O–Si/Si–O–Al bending band. The main geopolymeric gel and calcium silicate hydrate (C–S–H) gel co-exist and bond some remaining unreacted CFA spheres as observed in XRD and SEM–EXDA. The presence of gismondine (zeolite) was also observed in the XRD pattern.
Compressive strength and microstructural characteristics of class C fly ash geopolymer
AbstractGeopolymers prepared from a class C fly ash (CFA) and a mixed alkali activator of sodium hydroxide and sodium silicate solution were investigated. A high compressive strength was obtained when the modulus of the activator viz., molar ratio of SiO2/Na2O was 1.5, and the proper content of this activator as evaluated by the mass proportion of Na2O to CFA was 10%. The compressive strength of these samples was 63.4MPa when they were cured at 75°C for 8h followed by curing at 23°C for 28d. In FTIR spectroscopy, the main peaks at 1036 and 1400cm−1 have been attributed to asymmetric stretching of Al–O/Si–O bonds, while those at 747cm−1 are due to the Si–O–Si/Si–O–Al bending band. The main geopolymeric gel and calcium silicate hydrate (C–S–H) gel co-exist and bond some remaining unreacted CFA spheres as observed in XRD and SEM–EXDA. The presence of gismondine (zeolite) was also observed in the XRD pattern.
Compressive strength and microstructural characteristics of class C fly ash geopolymer
Guo, Xiaolu (author) / Shi, Huisheng (author) / Dick, Warren A. (author)
Cement and Concrete Composites ; 32 ; 142-147
2009-11-03
6 pages
Article (Journal)
Electronic Resource
English
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