Influence of Fly Ash on Geotechnical Behaviour of Red Mud: A Micro-mechanistic Study

Jha, AK and Kumar, D and Sivapullaiah, PV (2020) Influence of Fly Ash on Geotechnical Behaviour of Red Mud: A Micro-mechanistic Study. In: Geotechnical and Geological Engineering .

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Abstract

The disposal of highly alkaline and hazardous bauxite residue mud generated from the Bayer process in the alumina industry leads to the serious environmental impact on natural resources. Effective and bulk utilization of red mud needs to be done to minimize an adverse impact on environment. The present study contracts to explore the possible utilization of red mud as a geomaterial by modifying its properties with fly ash (Class �F�). Detailed geotechnical properties (plasticity characteristics, compaction characteristics, swell index and Unconfined compressive strength (UCS)), physicochemical properties (pH and electrical conductivity) and micro-analyses (XRD, SEM, EDAX and FTIR) have been performed in the red mud amended with varying fly ash content up to 80. The characterization of red mud demonstrates the higher value of specific gravity, liquid limit, optimum water content (OWC), maximum dry density (�dmax), pH value, and electrical conductivity than that of the same of fly ash. Further, the amendment with various fly ash content has observed a significant effect on the plasticity and compaction characteristics of the red mud. The results show a significant reduction in liquid limit, plastic limit, OWC and �dmax of red mud with an increase in fly ash content. Ultimate increase in the UCS of red mud is observed at its substitution with 15 fly ash which can be considered as an Optimum Fly Ash Content (OFC) from strength point of view. Further, experimental results are elucidated through physicochemical and microanalyses.

Item Type:	Journal Article
Publication:	Geotechnical and Geological Engineering
Publisher:	Springer
Additional Information:	The copyright of this article belongs to Springer
Keywords:	Alkalinity; Alumina; Aluminum oxide; Compaction; Compressive strength; Density (specific gravity); Electric conductivity; Physicochemical properties; Plasticity, Compaction characteristics; Electrical conductivity; Geotechnical properties; Maximum dry density; Micro-mechanistic; Optimum fly ash content; Optimum water content; Unconfined compressive strength, Fly ash
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	21 Aug 2020 11:03
Last Modified:	21 Aug 2020 11:03
URI:	http://eprints.iisc.ac.in/id/eprint/66002

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