Leaching of saltstones containing fly ash

Conference · Tue Jan 01 04:00:00 EST 1985

OSTI ID:6066347

Barnes, M W; Roy, D M; Langton, C A

Two types of fly ash were incorporated in saltstones designed for potential encapsulation of Savannah River Plant low level defense waste. These fly ashes have some cementitious properties while at the same time their presence in substitution for cement slows early hydration. Class C fly ash has a high calcium content and is considered cementitious; Class F fly ash has a low calcium content and is not classified as cementitious. Leach tests were performed and physical properties were measured for saltstones containing each class, to see the differences in the effect of the fly ashes. The four waste ions nitrate, nitrite, sodium and sulfate were shown to leach by diffusion. Effective diffusivities were determined for these ions. Data for nitrate, the most important species from the environmental point of view, are shown in Table A. Saltstones made with Class C fly ash have substantially lower leach rates than those made with Class F fly ash. The leach rates, and therefore the square roots of the effective diffusivities, have been found to be proportional to the pore surface area per unit volume (or the ratio of pore volume to pore radius), to the fraction of waste containing solution, and to the inverse of the fraction of calcium in the saltstone. Rates and diffusivities are not proportional to the water to cement ratio, because this number depends on whether the fly ash is counted as cementitious, as in Class C cement, or not cementitious, as in Class F cement. In fact the relatively small amount of calcium in Class F cement contributes to the cementitious properties overall, though not so much as Class C cement. 4 refs., 2 figs., 6 tabs.

• Research Organization: Pennsylvania State Univ., University Park (USA). Materials Research Lab.; Du Pont de Nemours (E.I.) and Co., Aiken, SC (USA). Savannah River Lab.
• DOE Contract Number: AC09-76SR00001
• OSTI ID: 6066347
• Report Number(s): DP-MS-85-158; CONF-851217-59; ON: DE86008046
• Country of Publication: United States
• Language: English

Related Subjects

052002 -- Nuclear Fuels-- Waste Disposal & Storage
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
36 MATERIALS SCIENCE
360604* -- Materials-- Corrosion
Erosion
& Degradation
AEROSOL WASTES
ALKALI METAL COMPOUNDS
ASHES
BUILDING MATERIALS
CATIONS
CEMENTS
CHARGED PARTICLES
CHEMICAL COMPOSITION
DATA
DISSOLUTION
EXPERIMENTAL DATA
FLY ASH
INFORMATION
IONS
LEACHING
LOW-LEVEL RADIOACTIVE WASTES
MATERIALS
NITRATES
NITRITES
NITROGEN COMPOUNDS
NUMERICAL DATA
OXYGEN COMPOUNDS
PORTLAND CEMENT
RADIOACTIVE MATERIALS
RADIOACTIVE WASTES
RESIDUES
SEPARATION PROCESSES
SODIUM COMPOUNDS
SULFATES
SULFUR COMPOUNDS
WASTE FORMS
WASTES