Ion migration associated with lime piles

Barker Edwin, James (2002). Ion migration associated with lime piles. University of Birmingham. Ph.D.

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Abstract

Lime may be added to soil, in order to improve its engineering characteristics, in a number of ways which rely on both the intimate lime-clay reaction and the migration of ions from the lime source into the soil being treated. Mechanisms and effects of ion migration through four different clay soils resulting from lime pile application were investigated. Laboratory samples (LI =1.2) were tested after 0-120 days, for acid soluble aluminium, calcium, magnesium and silicon concentrations, conductivity, shear strength, plastic limit, pH, water content and electrical potential between the lime pile and clay. Similar tests were carried out on intimately mixed lime-clay samples for comparison.

The lime pile and surrounding clay were found to act as an anode and cathode respectively. Pore water and calcium, hydrogen and hydroxide ions migrated away from the lime pile, although the migration mechanisms are different due to the different directions and magnitudes of the chemical, electrical and hydraulic drivers present. A consistent pattern of plastic limit rise, fall and subsequent rise was found. Increases in shear strength (limited to within 30 mm of the pile/soil interface) were attributed to ionic changes, causing thinning of the adsorbed water layers, and the formation of pozzolanic reaction products resulting from calcium and hydroxide ion migration.

Type of Work:	Thesis (Doctorates > Ph.D.)
Award Type:	Doctorates > Ph.D.
College/Faculty:	Schools (1998 to 2008) > School of Engineering
School or Department:	Department of Civil Engineering
Funders:	Engineering and Physical Sciences Research Council
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
URI:	http://etheses.bham.ac.uk/id/eprint/17403

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