Abstract
Retention curves and permeability coefficient were obtained for a tropical soil, a fertilizer industry waste-product (phosphogypsum), and varying proportions of their mixtures. In order to determine retention curves and permeability coefficient, filter paper and permeability tests, respectively, were performed on samples compacted at optimum moisture content. Filter paper tests were carried out on wetting path and permeability tests were performed with variable hydraulic head. Geotechnical characterization, compaction curves and retention curves for one of the mixtures were close to those obtained for the soil and the permeability coefficient of this mixture was slightly lower than the soil. Therefore, should not rule out using this waste-product in situations where the purpose is ensuring adequate disposal of waste phosphogypsum, rather than improving the hydromechanical behaviour of soil.
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