Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Microstructural characterization of alkali-activation of six Korean Class F fly ashes with different geopolymeric reactivity and their zeolitic precursors with various mixture designs
Abstract This study presents the mechanical strength testing results for alkali-activation of six different Class F fly ashes under varying activator/binder ratios, activator concentrations and curing temperature histories. It also reports on the synthesis of two functional zeolitic precursors formed in the fly ash geopolymerization: (1) nitrate sodalite, which may possess a relatively good Cation Exchange Capacity (CEC) for heavy metals; and (2) (basic) nitrite sodalite, which can be used for CO2 absorption. The mechanical strengths of the alkali-activated fly ashes are found to be more affected by the activator/binder ratio than the other variables. The nitrate sodalite and basic nitrite sodalite are identified in both X-Ray Diffraction (XRD) and Scanning Electron Microscope (SEM) images by showing ‘balls of yarn’ shapes. The presence of these crystalline products not only influences strength development in the alkali-activated fly ash samples but may also provide value-added properties for the geopolymer binder.
Microstructural characterization of alkali-activation of six Korean Class F fly ashes with different geopolymeric reactivity and their zeolitic precursors with various mixture designs
Abstract This study presents the mechanical strength testing results for alkali-activation of six different Class F fly ashes under varying activator/binder ratios, activator concentrations and curing temperature histories. It also reports on the synthesis of two functional zeolitic precursors formed in the fly ash geopolymerization: (1) nitrate sodalite, which may possess a relatively good Cation Exchange Capacity (CEC) for heavy metals; and (2) (basic) nitrite sodalite, which can be used for CO2 absorption. The mechanical strengths of the alkali-activated fly ashes are found to be more affected by the activator/binder ratio than the other variables. The nitrate sodalite and basic nitrite sodalite are identified in both X-Ray Diffraction (XRD) and Scanning Electron Microscope (SEM) images by showing ‘balls of yarn’ shapes. The presence of these crystalline products not only influences strength development in the alkali-activated fly ash samples but may also provide value-added properties for the geopolymer binder.
Microstructural characterization of alkali-activation of six Korean Class F fly ashes with different geopolymeric reactivity and their zeolitic precursors with various mixture designs
Jun, Yubin (Autor:in) / Oh, Jae Eun (Autor:in)
KSCE Journal of Civil Engineering ; 19 ; 1775-1786
21.01.2015
12 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Mechanical and microstructural dissimilarities in alkali-activation for six Class F Korean fly ashes
| Online Contents | 2014
Mechanical and microstructural dissimilarities in alkali-activation for six Class F Korean fly ashes
| British Library Online Contents | 2014