Hydrothermal reactions of fly ash. [Quarterly] report, April 1, 1993--June 31, 1993
Reactions which occur when fly ash is treated under hydrothermal conditions are being investigated, in order to determine the nature of the phases that form, assess the stabilities of these phases in the ambient environment and, finally, assess whether these phases are capable of sequestering hazardous species. Another reason for undertaken this proposed study is that, depending on the composition of the ash and the presence of selected additives, it may be possible under hydrothermal conditions to form compounds which have cementitious properties. Formation of four classes of compounds, which bracket likely fly ash compositional ranges. have been selected for study: calcium silicate hydrates, calcium silicosulfates, calcium aluminosulfates, and alkali aluminosilicates. Hydration of tricalcium aluminate in presence of Sr(OH){sub 2} or SeO{sub 2}, and of fly ash with Ca(OH){sub 2} and CaSO{sub 4}, 2H{sub 2}O was carried out and the product and pure structure analyzed.
- Research Organization:
- Pennsylvania State Univ., University Park, PA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG22-91PC91302
- OSTI ID:
- 10180328
- Report Number(s):
- DOE/PC/91302--7; ON: DE93041224
- Country of Publication:
- United States
- Language:
- English
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