Pavement Design of Ilaro- Papa Alanto Highway, Ogun State, Nigeria

Authors : A.C. Apata; A.A. Adekoya; U.U. Imoh

Volume/Issue : Volume 7 - 2022, Issue 3 - March

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The Ilaro to Papa Alanto highway is a major transportation route in the industrial complex of Portland cement manufacturing axis of Ogun State, Nigeria. Several years of studies and the observation ofthe rate and mode of the highways destabilization or failures prompted the necessityto carry out series geotechnical investigation of the various factor causing the failure, in order tooffer appropriate solutions for the failures and utilize the results of the investigation as credible basis for assisting the evolution of Nigeria standards for highway design. At present, no reliable standards exist in Nigeria, as current standards are generally considered inadequate. The Ilaro - Papa Alanto highway is a typical example of this unfortunate scenario. The present axle load is 505 heavy vehicle traffic which cannot be supported by the road pavement thickness of 120mm. Papa Alanto subbase has high Liquid Limit of 40% and Plasticity Index of 25% while Ilaro 50 %and 15% respectively. Both fall below the minimum requirement for road pavement of 35% for liquid limit and 12% for Plasticity Index. The soaked CBR of the Ilaro and Papa Alanto subgradeand subbase are 6.29% and 8.99% and 3.08% and 9.32% respectively. The increase in CBR reduced the required pavement thickness from 550mm to 50mm (1100% decrease) and reduced the cost of pavement construction from N8billion to N753million.

Keywords : Road failures, Highway, Geotechnical, Techniques, Engineering Properties and Terralite.


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31 - December - 2023

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