Crystal chemistry of portland cement hydrates as radioactive waste hosts. Final report, June 15, 1983-June 14, 1984. [Fixation of iodine by calcium aluminate hydrates, and fixation of strontium and cesium by using Stratling's compound]
Portland cement hydrates have been used as encapsulant/host phases in radioactive waste management. However, their phase chemistry and stability relationships are poorly defined. Therefore, on occasion, they have not performed as well as expected. As a result, their use has been mainly limited to low-level waste disposal. Since this knowledge gap existed, we had begun to investigate the crystal chemistry of the portland cement hydrates. It was our objective to identify potential hydrate host phases which were not only suitable for isolating radioactive-waste species but also inexpensive, easily processed, low-temperature materials. Initially, we were concentrating upon two areas of interest: the fixation of iodine by the calcium aluminate hydrates and the feasibility of using Stratling's compound as a host phase for cesium and strontium fixation. In both cases, a phase equilibrium study was initiated in order to identify phase relations and consequences of adding the species of interest to the system. An iodine-containing analogue of calcium monosulfoaluminate hydrate (C/sub 3/A.CaI/sub 2/.xH/sub 2/O) was identified as a possible host phase. CsOH was added to formulations in the neighborhood of Stratling's compound, in order to establish phase relations and identify the fixation ability of Stratling's compound and its associated hydrates. 11 figures, 9 tables.
- Research Organization:
- Pennsylvania State Univ., University Park (USA). Materials Research Lab.
- DOE Contract Number:
- AC02-83ER45013
- OSTI ID:
- 7069203
- Report Number(s):
- DOE/ER/45013-2; ON: DE84015112
- Resource Relation:
- Other Information: Portions are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
Similar Records
Physical chemistry of Portland-cement hydrate, radioactive-waste hosts. Progress report, June 15, 1984-January 15, 1985
Physical chemistry of portland-cement hydrate, radioactive-waste hosts: Final report, January 16, 1987--December 31, 1987
Related Subjects
PORTLAND CEMENT
PHASE STUDIES
RADIOACTIVE WASTE PROCESSING
CESIUM
IODINE 129
SOLIDIFICATION
STRONTIUM
EXPERIMENTAL DATA
HYDRATES
X-RAY DIFFRACTION
ALKALI METALS
ALKALINE EARTH METALS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BUILDING MATERIALS
CEMENTS
COHERENT SCATTERING
DATA
DIFFRACTION
ELEMENTS
INFORMATION
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
IODINE ISOTOPES
ISOTOPES
MANAGEMENT
MATERIALS
METALS
NUCLEI
NUMERICAL DATA
ODD-EVEN NUCLEI
PHASE TRANSFORMATIONS
PROCESSING
RADIOISOTOPES
SCATTERING
WASTE MANAGEMENT
WASTE PROCESSING
YEARS LIVING RADIOISOTOPES
052001* - Nuclear Fuels- Waste Processing