Hydrothermal reactions of fly ash with Ca(OH){sub 2} and CaSO{sub 4}{center_dot}2H{sub 2}O
Journal Article
·
· Cement and Concrete Research
- Pennsylvania State Univ., University Park, PA (United States). Intercollege Materials Research Lab.
Hydrothermal reactions of fly ash were investigated. Variations in reactivity depended on the presence of added Ca(OH){sub 2} or CaSO{sub 4}{center_dot}2H{sub 2}O. Isothermal calorimetry determined the kinetics of the reactions between fly ash and these compounds. Fly ash was activated by these calcium salts and activation influenced hydration rates as determined by the rates of heat evolution. X-ray diffraction analysis determined the phases formed as a result of hydrothermal treatment. Calcium silicate hydrate, tricalcium aluminate hydrate and ettringite were observed. The mechanical properties developed by hydrothermal treatment demonstrates that hazardous ashes could be consolidated to be handled. Alternatively, non-hazardous ashes can be reacted to form useful products.
- OSTI ID:
- 544095
- Journal Information:
- Cement and Concrete Research, Journal Name: Cement and Concrete Research Journal Issue: 8 Vol. 27; ISSN 0008-8846; ISSN CCNRAI
- Country of Publication:
- United States
- Language:
- English
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