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Analysis of Incremental Load Damaging Effects of Overloaded Trucks on Federal Highway Pavement Structures in Nigeria

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Document pages: 21 pages

Abstract: The study is to assess thepresent serviceability rating of Nigerian highways and the load damage effects of overloaded trucks. The researchers used theAmerican Association of StateHighway and Transportation Officials (AASHTO) methods. In this study, thehighway section of Lokoja-Abuja, Ilorin-Jebba and Abakiliki-Ogoja via Mbok roads were selected, and data were collectedthrough an axle-load survey, automatic traffic count and from secondarysources. The rate of gross vehicle weight violation was found, ranging from 20 to 94 of the axle load distribution across the studied network. Comparing theoverloaded vehicle damage factor (V.D.F.) and standard V.D.F., the range wasfrom 1.2 to 41.34 times across the road networks studied, and this explainedwhy the pavement structures of Nigerian roads tend to deteriorate during its service life rapidly. Presentserviceability rating was estimated at 3.45, 4.41 and 3.35 for Lokoja-Abuja,Ilorin-Jebba and Abakiliki-Ogoja roads respectively, showing depletion fromtheir initial conditions. The damaging effects of the HGV are more severe at Lokoja-Abuja Road (with g = 0.30), followed by Ilorin-Jebba Road (with g = 0.35) andin Abakiliki-Ogoja Road (with g = 0.43). The heaviest overload of 94 ofthe 6-axle vehicles plying at the Lokoja-Abuja road could explain this intensedamaging effect on the road pavement.

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