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Changes in geotechnical properties of urban soils during carbonation

Lookup NU author(s): Dr Ehsan Jorat, Dr Ben Kolosz, Dr Elisa Lopez-Capel, Professor David Manning

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Abstract

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.


Publication metadata

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

Pages: 912-918

Print publication date: 01/11/2015

Acceptance date: 01/01/1900

Publisher: IOS Press

URL: http://dx.doi.org/10.3233/978-1-61499-603-3-912

DOI: 10.3233/978-1-61499-603-3-912

Series Title: Fundamentals to Applications in Geotechnics


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