Abstract
The soils which show very high shear strength in a dry state but rapidly lose their strength on wetting are known as collapsible soils. Such rapid and massive loss of strength produces severe distress leading to extensive cracking and differential settlements, instability of building foundations, and even collapse of structures built on these soils. Waste marble dust is an industrial byproduct and is being produced in large quantities globally poses an environmental hazard. Therefore, it is of the utmost need to look for some sustainable solution for its disposal. The present study focused on the mitigation of the collapse potential of CL-ML soil through a physio-chemical process. The soil is sensitive to wetting, warranting its stabilization. Waste marble dust (WMD) in varying percentages was used as an admixture. The study's optimization process showed that geotechnical parameters of collapsible soil improved substantially by adding waste marble dust. Plasticity was reduced while Unconfined Compressive Strength (UCS) significantly increased while swelling was reduced to an acceptable limit. The California Bearing Ratio (CBR) also exhibits considerable improvement. This study appraises the safe disposal of hazardous waste safely and turns these into suitable material for engineering purposes. Doi: 10.28991/cej-2021-03091746 Full Text: PDF
Highlights
Collapsible soils are moisture sensitive soils that show a huge decrease in volume after wetting
The results depict that the Optimum Moisture Content (OMC) rose from 15.7% to 18.22%, showing a directly proportional relation with Waste marble dust (WMD) dosage
A similar decrease in Maximum Dry Density (MDD) was reported by Deboucha et al (2020) [23] with a 5% addition of marble dust in fine grained soil
Summary
Collapsible soils are moisture sensitive soils that show a huge decrease in volume after wetting. These soils normally consist of silts and fine sands. These soils are traceable throughout the world but are mainly found in dry to semi-dry regions [1]. Saturation in the Collapsible soils causes a rapid decrease in the volume, especially under an additional load. Such situations cause excessive deformation in the soil, destructive for the structures [2]. Structures built on collapsible or expansive soils are vulnerable to destruction and failure. The structures built on such soils have been severely damaged in the past. Fifteen hundred and five (1505) buildings and 80 km long underground pipeline were severely damaged in China due to these collapse incidents during 1974-75 [4]
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