Lookup NU author(s): Dr Ehsan Jorat,
Dr Ben Kolosz,
Dr Elisa Lopez-Capel,
Professor David Manning
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Urban soils that contain materials derived from demolition undergo carbonation as a consequence of a reaction between Ca derived from cement and concrete, and carbonate ultimately derived from the atmosphere. Estimated rates of CaCO3 accumulation are equivalent to the removal of 150T CO2 ha-1 yr-1. Although this process has benefits for carbon capture, the formation of CaCO3 within the soil potentially affects the geotechnical properties. Trial pits at a number of locations have consistently yielded CaCO3 contents of 20 wt% from 0-1m depth. Carbonate has formed in intergranular space within the soil, possibly with improvements in strength but also with changes in permeability that may affect through drainage. This paper investigates the limits to CaCO3 formation imposed by soil porosity for a number of artificial soils: ‘well sorted sand or gravel’, ‘sand and gravel, mixed’, ‘silt’ and ‘clay’. Calculated values for CaCO3 for the various soil types are used to determine limits to CaCO3 formation within the first 1 m of sediments at the Science Central Site in Newcastle upon Tyne, UK, using information derived from five trial pits within made ground.
Author(s): Jorat ME, Kolosz BW, Sohi S, Lopez-Capel E, Manning DAC
Editor(s): D. Manzanal and A.O. Sfriso (Eds.)
Publication type: Conference Proceedings (inc. Abstract)
Publication status: Published
Conference Name: 15th Pan-American Conference on Soil Mechanics and Geotechnical Engineering
Year of Conference: 2015
Print publication date: 01/11/2015
Acceptance date: 01/01/1900
Publisher: IOS Press
Series Title: Fundamentals to Applications in Geotechnics