The geochemistry and geotechnical (compaction) analysis of lateritic soils: A case study of Okpanam area

AshEse Journal of Engineering                                                                            

Vol. 2(3), pp. 075-082, May, 2016

ISSN: 2397-0677

© 2016 AshEse Visionary Limited

Full Length Research

Efeoghene Enaworu1*, Felix C. Ugbe1, Oluwatosin J. Rotimi2

 

1Geology Department, Delta State University, Abraka, Delta State, Nigeria.

2Petroleum Engineering Department, Covenant University, Canaanland, Ota, Ogun State, Nigeria.

 

*Corresponding author. E-mail:This email address is being protected from spambots. You need JavaScript enabled to view it.

 

Received March, 2016; Accepted May, 2016

 

Abstract

The major elements of geochemistry and compaction characteristics of lateritic soils in Okpanam area, located in the Anambra Basin were investigated. This was with a view to determine the silica sesquioxide ratio and assess the suitability of the lateritic soils as a highway sub-base and sub-grade materials. Bulk samples of soil were collected from two separate horizons – A and B at depths of 1.38m and 3.39m in a burrow pit. The major elements geochemical analysis was carried out by means of Atomic Absorption Spectrometry (AAS). The geotechnical analysis – compaction, was executed by following the modified AASHTO test (T-180). The amount of total irons in terms of iron III oxide ranged from 6.07% - 7.22%. Silica – sesquioxide of iron and aluminium molar ratios were between 1.9 and 1.96. Compaction characteristics values for this area varied with sampling depth, with an average Optimum Moisture Content (OMC) range of 11.10% to 9.30% and an average Maximum Dry Density (MDD) range of 2.00g/cm3 to 2.06g/cm3. With these values, the soils can be compacted at specific optimum moisture contents in order to ensure close packing of the soil particles under compaction energy, thus ensuring their subsequent use as sub-base and sub-grade highway construction materials.

Key words:Optimum moisture content, Compaction, Lateritic soils, Silica-sesquioxide ratio, Maximum dry density.

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