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Erschienen in: International Journal of Geosynthetics and Ground Engineering 1/2022

01.02.2022 | Original Paper

Experimental Investigation and Performance Evaluation of Lithomargic Clay Stabilized with Granulated Blast Furnace Slag and Calcium Chloride

verfasst von: Balaji Lakkimsetti, Sitaram Nayak

Erschienen in: International Journal of Geosynthetics and Ground Engineering | Ausgabe 1/2022

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Abstract

South-western coast of India has vast deposits of highly problematic silty soil normally referred to as lithomargic clay in the literature. This problematic silty soil is characterized by its high sensitivity to moisture content with high erosion potential and low shear strength. This paper attempts to address this problem by chemical stabilization of lithomargic clay using Calcium chloride (CaCl2) and an industrial by-product obtained from the iron industry, i.e., granulated blast furnace slag (GBFS). Disposing of huge quantities of GBFS poses a severe impact on the environment. GBFS has high pozzolanic activity, and utilizing it for the stabilization of soils would be a sustainable and eco-friendly solution. To optimize CaCl2 and GBFS contents for achieving better geotechnical properties of the stabilized soil and to understand the mechanism governing the improvement, a series of laboratory experiments were performed on lithomargic clay by stabilizing it with different amounts of CaCl2 and GBFS. Optimum CaCl2 and GBFS contents obtained from the laboratory experiments are 6% and 20%, respectively, and a significant increase in strength was achieved with this optimized mix. Scanning electron microscope and X-ray diffraction analyses were carried out on the powdered samples of the treated soil, and the improvement in strength was justified through the microstructural changes observed due to the formation of cementitious compounds. Response of strip footings lying on unstabilized, and stabilized soils was analyzed using PLAXIS-2D. Numerical simulations showed a significant increase in the allowable bearing pressure with stabilization of lithomargic clay with GBFS and CaCl2.

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Metadaten
Titel
Experimental Investigation and Performance Evaluation of Lithomargic Clay Stabilized with Granulated Blast Furnace Slag and Calcium Chloride
verfasst von
Balaji Lakkimsetti
Sitaram Nayak
Publikationsdatum
01.02.2022
Verlag
Springer International Publishing
Erschienen in
International Journal of Geosynthetics and Ground Engineering / Ausgabe 1/2022
Print ISSN: 2199-9260
Elektronische ISSN: 2199-9279
DOI
https://doi.org/10.1007/s40891-022-00355-5

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