Improvement in Compaction Characteristics of Lateritic Gravel Soils Stabilised with Locust Bean Pod Extract
DOI:
https://doi.org/10.26437/ajar.v10i2.843Keywords:
Chemical stabilisation. compaction. gravel. lateritic. soil.Abstract
Purpose: The compaction properties of chemically stabilised weak or marginal sub-grade soils were investigated using locust bean pod extract (LBPE) derived from soaked locust bean pods (LBP).
Design/Methodology/Approach: An experimental approach was employed. The extract was created by pounding and soaking the locust bean pods for varying durations, ranging from 1 day to 28 days. Soil samples for the research were collected from three different sources: Agyei Ano South and behind the AVIC laboratory of Sunyani Technical University, both located in the Sunyani East Municipality and Fiapre in the Sunyani West Municipality. The tests were conducted at the geotechnical engineering laboratory (AVIC lab) of Sunyani Technical University (STU) in the Bono Region of Ghana. Chemical and elemental analyses were carried out.
Findings: The experimental findings indicate that the locust bean pod extract generally raises the Maximum Dry Density (MDD) and reduces the Optimum Moisture Content (OMC). In comparison, the control specimen recorded 1.97g/cm3 and 13.10% for MDD and OMC, respectively. The soil's dry density increases with the extract's rising concentration. Concentrations of 50g/l and 100g/l of extract notably increased the MDD of the stabilised soil compared to the control.
Research Limitation: Soil samples were collected from three locations, so the findings cannot be generalised.
Practical Implication: This research can enhance eco-friendly soil stabilisation methods, consequently reducing carbon footprints.
Social Implication: This study will assist road construction industry policymakers in finding sustainable ways of improving the compaction characteristics of lateritic gravel soils using a biopolymer such as a locust bean pod extract.
Originality/ Value: This study is grounded in cost reduction and sustainability in road construction, specifically in resource use and earth movement reduction.
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