Abstract
The natural stone industry generates large amounts of industrial waste every year. Limestone powder produced by the activity of this industry is dumped into landfills, generating an environmental impact that could be reduced by using this waste as a binder in building materials. In the present work, the use of this by-product as an addition for soil improvement of clayey soils has been studied. The tested natural soil is a soft clay from southeastern Spain, which has been mixed by adding 5, 10, 15, 20, and 25% of dry limestone dust by total dry weight of the soil. The natural soil and the additive have been characterized, in addition to the common geotechnical tests, by means of X-Ray diffraction and X-Ray Fluorescence. The improvement of the geotechnical properties of the mixed soil has been evaluated by means of the change in the Atterberg limits, free swell index, unconfined compressive strength, and one-dimensional consolidation test. The change in the microstructure of the mixed soil has been studied by scanning electron microscopy. In general, the results obtained show an increase in the strength of the soil and a reduction of its deformability when limestone powder is added.
Highlights
Soil improvement technique has been widely used to reduce soil deformability and increase the shear strength of soft soils
Sivrikaya al. [23]Sivrikaya reported et a decrease reported a decrease in Atterberg limits and an increase in the maximum dry unit weight of soil the in Atterberg limits and an increase in the maximum dry unit weight of the compacted mixed compacted whenwas marble waste powder was added to an artificial clayeyinsoil
The present work broadens the knowledge of the effect of this by-product as a binder on the compressive strength, microstructure, and swelling potential of the mixed soil, which has hardly been studied
Summary
Soil improvement technique has been widely used to reduce soil deformability and increase the shear strength of soft soils. [23]Sivrikaya reported et a decrease reported a decrease in Atterberg limits and an increase in the maximum dry unit weight of soil the in Atterberg limits and an increase in the maximum dry unit weight of the compacted mixed compacted whenwas marble waste powder was added to an artificial clayeyinsoil. Sabat and Muni [30] reported an increase in the strength properties of clayey soils when limestone dust was added. The effect of adding limestone powder waste to a clayey soil was studied. The present work broadens the knowledge of the effect of this by-product as a binder on the compressive strength, microstructure, and swelling potential of the mixed soil, which has hardly been studied. Deformability and strength properties of the mixed soil are studied by physical and mechanical tests
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