Effect of Sawdust on the Geotechnical Properties of a Lateritic Soil

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Effect of Sawdust on the Geotechnical Properties of a Lateritic Soil

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Abstract

In this work, laboratory investigation on the stabilization of residual lateritic soil with up 15 % sawdust by dry weight of the soil was carried out with the aim of determining its potential effects on the properties of the soil. The index properties, swelling properties, unconfined compressive strength, permeability characteristics, CBR and moisture density relationship of the stabilized soil were studied. X-ray diffraction analysis showed that the lateritic soil consists of kaolinite, quartz, mica, hematite, and K-feldspar. The lateritic soil classified as ML in the USCS and in group A-7-5 of the AASTHO classification. The liquid limit, plasticity index and maximum dry unit of the soil decreased with increasing sawdust content while the linear shrinkage and optimum moisture content increased with increasing sawdust content. CBR, cohesion and unconfined compressive strength increases with addition of sawdust up to an optimum value of about 7.5%, beyond which these parameters begin to decrease. On the other hand, permeability and compression index decreases to lowest values at about 7.5 %, beyond which they begin to increase. This study reveal that the stabilized soil may not be suitable for road construction as the UCS and soaked CBR of the stabilized soil failed to meet the requirements for embankment, sub-base and base course materials.


Publication Info:

Author: Owoyemi, O.O.

Volume: 57

Issue: March

Published By: Journal of Mining and Geology, 2024-03-01

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