Durability of a cementitious wasteform for intermediate level waste

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dc.contributor.authorMcGlinn, PJen_AU
dc.contributor.authorBrew, DRMen_AU
dc.contributor.authorAldridge, LPen_AU
dc.contributor.authorPayne, TEen_AU
dc.contributor.authorOlufson, KPen_AU
dc.contributor.authorPrince, KEen_AU
dc.contributor.authorKelly, IJen_AU
dc.date.accessioned2025-01-16T00:42:54Zen_AU
dc.date.available2025-01-16T00:42:54Zen_AU
dc.date.issued2008-12-01en_AU
dc.date.statistics2025-01en_AU
dc.descriptionPhysical copies held by ANSTO Library at DDC: 621.4838/42en_AU
dc.description.abstractCementitious material is the most commonly used encapsulation medium for low and intermediate level radioactive waste. This paper focuses on the aqueous durability of a Materials Testing Reactor (MTR) cementitious wasteform – a possible candidate for the proposed intermediate level waste management facility in Australia. A series of medium term (up to 92 months) durability tests, without leachate replacement, were conducted on samples of this wasteform. The wasteform was made from cement, ground granulated blast furnace slag and a simulated waste liquor. The compressive strength (39 MPa) was typical of MTR cement wasteforms and well above that required for handling or storage. The wasteform was an inhomogeneous mixture containing calcite, a calcium silicate hydrate phase, hydrotalcite and unreacted slag particles. After leaching for 92 months the crystallinity of the calcium silicate hydrate phase increased. The majority of the releases of Ca, Si, Al, Sr, S, Na and K was reached within 4 days of leaching, with the maxima ie. the highest concentrations in the leachates, occurring at 3 months for Ca, Al, Sr, S, Na and K, and at 1 month for Si. For the longer leach periods (6 months and 3 months respectively) there was a slight reduction in concentration in the leachates, and these levels were similar to those for the longest period of 92 months, suggesting steady-state conditions prevailing after 3 to 6 months of leaching. The highest releases of matrix elements were for Na (37%), K (40%) and S (16%). Releases for elements such as Ca, Na, Al and Sr were similar in magnitude to those reported by the UKAEA in earlier MTR studies. After leaching for 92 months there was an alteration layer about 80 ∞m deep where calcium has been depleted. Na, K and Sr showed signs of diffusion towards the outer part of the cement samples. © 2008 Materials Research Societyen_AU
dc.identifier.booktitleMRS Online Proceedings Library 1107en_AU
dc.identifier.booktitleScientific basis for nuclear waste management XXXI : symposium held September 16-21, 2007, Sheffield, United Kingdomen_AU
dc.identifier.citationMcGlinn, P. J., Brew, D. R. M., Aldridge, L . P., Paune, T. E., Olufson, K. P., Prince, K. E., & Kelly, I. J. (2008). Durability of a cementitious wasteform for intermediate level waste. Paper presented to the Scientific basis for nuclear waste management XXXI. In R. W. Grimes, J. W. Hyatt, N. C. Roberts, & W. E. Lee (Eds), Scientific basis for nuclear waste management XXXI : symposium held September 16-21, 2007, Sheffield, United Kingdom, (Vol. 1107, pp. 101-108). doi:10.1557/PROC-1107-101en_AU
dc.identifier.conferenceenddate2007-09-21en_AU
dc.identifier.conferencenameScientific Basis for Nuclear Waste Management XXXIen_AU
dc.identifier.conferenceplaceSheffield, United Kingdomen_AU
dc.identifier.conferencestartdate2007-09-16en_AU
dc.identifier.editorsR. W. Grimes, J. W. Hyatt, N. C. Roberts, W. E. Leeen_AU
dc.identifier.isbn9781605110790en_AU
dc.identifier.issn2731-5894en_AU
dc.identifier.issn1946-4274en_AU
dc.identifier.pagination101-108en_AU
dc.identifier.urihttp://dx.doi.org/10.1557/proc-1107-101en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15946en_AU
dc.identifier.volume1107en_AU
dc.languageEnglishen_AU
dc.language.isoenen_AU
dc.publisherSpringer Natureen_AU
dc.subjectIntermediate-level Radioactive Wastesen_AU
dc.subjectLow-level radioactive wastesen_AU
dc.subjectMaterials testingen_AU
dc.subjectCementsen_AU
dc.subjectSlagsen_AU
dc.subjectCalciteen_AU
dc.subjectLeachingen_AU
dc.subjectCalcium silicatesen_AU
dc.subjectCrystallizationen_AU
dc.titleDurability of a cementitious wasteform for intermediate level wasteen_AU
dc.typeConference Paperen_AU
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