Abstract

This study is aimed at determining the influence of stabilization by percentage increase in volume of cement on Geotechnical properties of some lateritic soils obtained from two borrow pits along Agbor-Sapele road, Western Niger Delta, Nigeria. The soils are classified as A-7-6 and A-7-5 with high percentage of Fines, averaging 60.43%. These natural soil samples falls short of the Federal Ministry of Works Standard based on grain size and consistency limits. The values of 1950.91 Kg/m3 and 22.70% obtained for maximum dry density (MDD) and optimum moisture content (OMC) when soil was treated at 10% by volume of cement, reveals the fact that higher unconfined compressive strength (UCS) values would be noticeable at 10% by volume addition of cement with increasing energy level of compaction, than that to be obtained at 5% by volume of addition of cement with MDD of 1933.80 Kg/m3 and OMC 22.78%. When the soaked California Bearing Ratio (CBR) values for treated soils were considered, the reduction in soaked CBR value is minimal at 10%, with an average of 76.33% than that obtained at 5% by volume of cement with an average of 78.45%, compacted at varying energy level. In general, the study result clearly reveals that increasing cement content would result in improved strength characteristics even as permeability decreased from 6.744x10-8 mm/s to 6.129 x 10-8 mm/s across the compaction level of the stabilized soil samples.

Highlights

  • This study is aimed at determining the influence of stabilization by percentage increase in volume of cement on Geotechnical properties of some lateritic soils obtained from two borrow pits along Agbor-Sapele road, Western Niger Delta, Nigeria

  • The Niger Delta region is characterized by soils which are susceptible to decline in geotechnical properties, a situation closely related to its annual high precipitation which generally impacts negatively on the geotechnical properties of lateritic soil found in the flat plains

  • Where these conditions are not met, soil stabilization processes are employed before such soils are considered suitable for use as road construction material, as observed by (Akpokodje, 1986b), who recommended the use of 3 – 5% by weight of cement to stabilize some lateritic soils of Eastern Niger Delta for use as road construction material

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Summary

Introduction

This study is aimed at determining the influence of stabilization by percentage increase in volume of cement on Geotechnical properties of some lateritic soils obtained from two borrow pits along Agbor-Sapele road, Western Niger Delta, Nigeria. In the work of (Tom and Krishna, 2006), they opined that the desirable properties of lateritic soil used as sub grade materials includes; stability, incompressibility, permanency of strength, minimum changes in volume under adverse weather and groundwater conditions, good drainage and ease of compaction, which is of great concern to transportation and geotechnical engineers Where these conditions are not met, soil stabilization processes are employed before such soils are considered suitable for use as road construction material, as observed by (Akpokodje, 1986b), who recommended the use of 3 – 5% by weight of cement to stabilize some lateritic soils of Eastern Niger Delta for use as road construction material. This research work is aimed at assessing the influence of increasing cement content on some geotechnical properties of selected lateritic soils of western Niger Delta o Sapele-Agbor Road, Nigeria

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