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Suitability of Quarry Dust as Improvement to Cement Stabilized-Laterite for Road Bases
Eze-Uzomaka, Osondu Johnson Professor, Department of Civil Engineering, University of Nigeria, Nsukka, Enugu State, Nigeria Agbo, Daniel Research student, Department of Civil Engineering, University of Nigeria, Nsukka, Enugu State, Nigeria
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ABSTRACT |
The use of laterite stabilized with cement using quarry dust as additive for use as base course material was investigated. The laterite soil used was an A-2-6 and GP soil using AASHTO and USCS classification, obtained from Ikpayongo. It was stabilized with 2-10% cement and 10-50% quarry dust by weight of dry soil. Soil samples were subjected to General classification test. Using the West African Standard (WAS) compaction energy, samples were also subjected to California Bearing Ratio (CBR) test, Unconfined Compressive Strength (UCS) test, and the Durability test to ascertain the reliability of the strength tests. Results showed that Liquid Limit, plastic Limit, Plasticity Index, and maximum dry density (MDD) decreases with increase quarry dust content, in all the cement proportions used. Unconfined Compressive strength increased with quarry dust content, for all the cement proportions regardless of curing age. California Bearing Ratio (CBR) value increased from 96% at 2%cement+10% quarry dust to 296% at 10%cement+50%quarry dust. Based on results from the study, the use of 6%cement+30%quarry is recommended for use as base course material. Economic analysis from this research reveals that stabilizing Ikpayoungu laterite with 6%cement+30%quarry dust results in savings of 21% cost compared with the use of only cement. A second order polynomial model gives the best fit to test results, and a compound linear model was found to predict well the relationship between CBR, cement and quarry dust used, but was not reasonable when tried for the 7 days UCS.
Keywords: Ikpayongo laterite, cement, stabilization, quarry dust, strength Indices.
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