nerc.ac.uk

Retention of chlorine-36 by a cementitious backfill

van Es, E.; Hinchliff, J.; Felipe-Sotelo, M.; Milodowski, A.E.; Field, L.P.; Evans, N.D.M.; Read, D.. 2015 Retention of chlorine-36 by a cementitious backfill. Mineralogical Magazine, 79 (6). 1297-1305. 10.1180/minmag.2015.079.6.05

Before downloading, please read NORA policies.
[thumbnail of Open Access Paper]
Preview
Text (Open Access Paper)
Cl-36 Mineralogical Magazine 2015.pdf - Published Version
Available under License Creative Commons Attribution 4.0.

Download (417kB) | Preview

Abstract/Summary

Radial diffusion experiments have been carried out to assess the migration of 36Cl, as chloride, through a cementitious backfill material. Further experiments in the presence of cellulose degradation products were performed to assess the effect of organic ligands on the extent and rate of chloride diffusion. Results show that breakthrough of 36Cl is dependent on chloride concentration: as the carrier concentration increases, both breakthrough time and the quantity retained by the cement matrix decreases. Experiments in the presence of cellulose degradation products also show a decrease in time to initial breakthrough. However, uptake at various carrier concentrations in the presence of organic ligands converges at 45% of the initial concentration as equilibrium is reached. The results are consistent with organic ligands blocking sites on the cement that would otherwise be available for chloride binding, though further work is required to confirm that this is the case. Post-experimental digital autoradiographs of the cement cylinders, and elemental mapping showed evidence of increased 36Cl activity associated with black ash-like particles in the matrix, believed to correspond to partially hydrated glassy calcium-silicate-sulfate-rich clinker.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1180/minmag.2015.079.6.05
ISSN: 0026461X
Date made live: 15 Jan 2016 11:08 +0 (UTC)
URI: https://nora.nerc.ac.uk/id/eprint/512653

Actions (login required)

View Item View Item

Document Downloads

Downloads for past 30 days

Downloads per month over past year

More statistics for this item...