Washbourne, C; (2009) Ground Engineering Using ‘Waste’ Materials. Masters thesis , University of Newcastle upon Tyne.

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Abstract

Carbonation of calcium-rich materials has been proposed as a potentially viable method of CO2 capture and storage over geological timescales, exploiting high turnover of C through soils to passively fix carbon. This study confirms that soil-mixed iron and steel slag actively promotes CO2 sequestration, in an in situ setting, in temperate U.K. soils. Geophysical modelling and analysis of ground investigation data shows the persistence of slag to significant depth at the former site of Consett Iron and Steel works, of which the upper 300mm were investigated. Calcimeter analysis of 65 soil samples yields a mean calcium carbonate concentration of 8.5% ± 0.18 throughout the site profile. Isotope data confirms the atmospheric provenance of CO2 in the calcite, with δ13C between -11.86‰ and -20.46‰ and δ18O between -10.00‰ and -12.47‰, demonstrating hydroxylation of atmospheric carbon and organic sequestration pathways. Carbon sequestration modelling for the site, illustrates an idealised carbon capture potential of 1,431,375 tonnes CO2, or 2.40tC/m2. Collated experimental data confirms the significance of slag as a potentially effective material in carbon sink engineering, as a passive sequestration agent. Keywords: Geochemical, Calcium carbonate, Slag, Consett, Sequestration, Carbon Sink, Geophysical,

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