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Modification to the flow properties of repository cement as a result of carbonation

Purser, G.; Milodowski, A.E.; Harrington, J.F.; Rochelle, C.A.; Butcher, A.; Wagner, D.. 2013 Modification to the flow properties of repository cement as a result of carbonation. Procedia Earth and Planetary Science, 7. 701-704. 10.1016/j.proeps.2013.03.102

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Abstract/Summary

The current UK repository concept for low- and intermediate-level radioactive wastes involves using large quantities of cementitious materials for both construction and buffer/backfill. CO2 generated from degradation of waste organic material results in cement carbonation and associated mineralogical changes. Hydraulic and gas permeability tests were performed at 4 MPa and 40 °C. Carbonation halved the permeability of Nirex Reference Vault Backfill (NRVB) cement under these repository conditions. Mineralogical changes occurred in a narrow zone along the leading edge of a migrating reaction front and decreased porosity. The small reduction in permeability (and slightly elevated pressures) that resulted is considered to have minor impact on the permeable characteristics of the NRVB.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/j.proeps.2013.03.102
ISSN: 18785220
Date made live: 06 Sep 2013 08:28 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/503144

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