Reuse of excavated soils in MSW landfills liners is not always feasible, due to their geotechnical properties that have to meet the requirements of the existing regulation. This paperdeals with a case history occurred in the north east of Italy and shows an in-situ mixing procedure of a sandy silt with a medium plastic clays, able to achieve a homogenous mineral barriers suitable for landfill. A laboratory investigation was firs carried out to evaluate the best percentages of silt and clay in the mix. Field tests were planned using a soil stabilizer machine for mixing the two soils at different percentages by weight. Laboratory tests, performed on samples collected in situ, showed a very good soil homogenization. In this case history, the reuse of a relevant quantity of excavated silt, has also assumed a strategic importance related to economic issues and environmental sustainability.
USE OF SILT-CLAY MIXTURES IN MSW LANDFILLS COVER SYSTEMS
FAVARETTI, MARCO
2013
Abstract
Reuse of excavated soils in MSW landfills liners is not always feasible, due to their geotechnical properties that have to meet the requirements of the existing regulation. This paperdeals with a case history occurred in the north east of Italy and shows an in-situ mixing procedure of a sandy silt with a medium plastic clays, able to achieve a homogenous mineral barriers suitable for landfill. A laboratory investigation was firs carried out to evaluate the best percentages of silt and clay in the mix. Field tests were planned using a soil stabilizer machine for mixing the two soils at different percentages by weight. Laboratory tests, performed on samples collected in situ, showed a very good soil homogenization. In this case history, the reuse of a relevant quantity of excavated silt, has also assumed a strategic importance related to economic issues and environmental sustainability.Pubblicazioni consigliate
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