Hydrothermal reactions of fly ash. [Quarterly] report, January 1, 1994--March 31, 1994

Technical Report · Sun May 01 04:00:00 EDT 1994

DOI:https://doi.org/10.2172/10147781· OSTI ID:10147781

Brown, P W

The reactions which occur when fly ash is treated under hydrothermal conditions are being investigated. This is being done for two primary reasons. The first of these is to determine the nature of the phases that form, to assess the stabilities of these phases in the ambient environment and, finally, to assess whether these phases are capable of sequestering hazardous species. The second reason for undertaking 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. These are calcium silicate hydrates, calcium silicosulfates, calcium aluminosulfates, and alkali aluminosflicates. The specific compounds fabricated will be determined and their stability regions assessed. As a part of stability assessment, the extent to which selected hazardous species are sequestered will be determined. Finally, the cementing properties of these compounds will be established.

• Research Organization: Pennsylvania State Univ., University Park, PA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FG22-91PC91302
• OSTI ID: 10147781
• Report Number(s): DOE/PC/91302--10; ON: DE94011121; BR: AA1525050
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800
ADDITIVES
ALKALI METAL COMPOUNDS
ALUMINIUM OXIDES
CALCIUM COMPOUNDS
CEMENTING
CHEMICAL PREPARATION
FLY ASH
HAZARDOUS MATERIALS
HYDRATES
HYDROTHERMAL ALTERATION
PROGRESS REPORT
SILICATES
SULFATES
WASTE MANAGEMENT
WASTE PRODUCT UTILIZATION