Utilization of Marble as a Stabilizer of Lateritic Soil for Pavement Works in Southwestern Nigeria
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Date
2017
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USEP: Journal of Research Information in Civil Engineering
Abstract
The increasing cost of traditional stabilizing agents and the need for the economical utilization of alternative materials for beneficial engineering purposes requires an investigation into the stabilizing potential of marble for the stabilization poor lateritic soils, to improve their geotechnical properties for pavement works. A lateritic soil classified as A-2-6(0) according to AASHTO classification system was treated with 0 – 6% (2% increment) proportions of crushed marble by dry weight of soil. A total of ten samples of laterite, five samples each, were collected from burrow pits in Oyun and University of Ilorin campus, Ilorin, Kwara State, Central Nigeria. The samples were mixed with marble in various proportions, and subjected to Compaction and California Bearing Ratio (CBR) tests. It was observed that the Maximum Dry Density (MDD) at 0, 2, 4 and 6% marble content were 2.0, 2.1, 1.9 and 2.0 g/cm3, respectively and the Optimum Moisture Content (OMC) were 14.5, 10.5, 13.5 and 15% for the laterite sample at Oyun. The corresponding values of MDD and OMC for the sample at the University of Ilorin Campus were 1.65, 1.83, 1.69 and 1.87g/cm3 and 20, 17, 21 and 12%, respectively. Results show that, for all marble contents, the unsoaked and soaked CBR values increased with increase in marble content from 0-2%, and decreased for further increase in marble content up to 6%. Also, the CBR for both the unsoaked and soaked conditions reached maximum values at 2% marble content, indicating that the optimum content of marble required to stabilize an A-2-6(0) lateritic soil is 2%. The soaked CBR values of %0 and 47% obtained, respectively for unsoaked and soaked conditions for the sample at Oyun, which are greater than 30% imply that 2% marble content is
Adedoyin USEP: Journal of Research Information in Civil Engineering, Vol.14,No.2, 2017
et al
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suitable for stabilizing lateritic soil for the production of subbase course in pavement works.
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Keywords
Stabilizer, marble, lateritic soil, maximum dry density, optimum moisture content, california bearing ratio