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World Journal of Engineering
Research and Technology

An International Peer Reviewed Journal for Engineering Research and Technology

ISSN 2454-695X

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Abstract

GEOTECHNICAL ENGINEERING PROPERTIES OF CLAY SOIL IN IBADAN, UNIVERSITY OF IBADAN

Kareem Cornelius Aremu*, Prof. O. A. Agbede and Dr. B. I. O. Dahunsi

ABSTRACT

This project reports the outcome of an investigation into the effect of lime on the some geotechnical properties of clay soil in Ibadan, to ascertain its suitability for use as a modifier or stabilizer in clay treatment. Three samples were collected from three different locations namely, Odo-ona, Ibadan Grammar School area and Ogunpa all in Ibadan South-West, Ibadan North-East and Ibadan North-West Local Governments respectfully. Varying percentages of 2,4,8,10 and 12%lime were used in the treatment of clay. Classification, Atterberg, Compaction, and California bearing ratio (CBR) tests, were conducted on the specimens. Results of tests showed that sample „A? (Odo-ona) was an A-7-6 soil, according to the AASHTO classification system. Liquid limit reduced from 66 % at 0 % lime to 48 % at 12% lime content on sample „A?, 47.5 % at 0 % lime to 32% at 12% lime content on sample „B?, and while sample „C? drops from 36% at 0% lime to 25% at 12% lime by dry weight of the clay samples, the plastic limit increment and plastic index reduction of the three samples are tabulated on table 4.2. The maximum dry density of sample? A? reduces from 1.51 Mg/m3 to 1.38 Mg/m3, sample „B? increases from 2.05 Mg/m3 to 2.18 Mg/m3, while sample „`C? increases from 3.50 Mg/m3 to 3.59 Mg/m3 on a range of 0% - 12 % lime. At the optimum lime content, a maximum CBR value of 38 % was achieved for sample „A?, 50% for sample „B? and 48% for sample „C?. In conclusion, the improvements noticed in some of the geotechnical properties of sample „A? were not adequate for its use in roadwork but samples B and C were adequate, 40% CBR is recommended by Nigeria General Specification for highway and bridges. However, lime can be used as a modifier in the stabilization of sample A with cement or other additives but for samples B and C, lime is a stabilizer, likewise, test could be performed in a wider range across the country to provide data to enhance the relevant equation.

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