ABSTRACT
Various methods were used to design asphaltic concrete, hot rolled and mastic asphalts. Asphaltic concrete and mastic asphalt were designed principally using the Marshall procedure, while hot rolled asphalt was designed according to BS 594 and a method proposed for gap-graded mixes. A typical surface dressing design was also carried out for a lightly trafficked road suitable for Northern Nigeria. The optimum binder content and other design parameters were determined for the surfacings investigated. Some of the values obtained were 6.9%, 6.86% and 13.7% as binder content for asphaltic concrete, hot rolled and mastic asphalts respectively. 17.2kN, 8.4kN and 10.2kN for stability. 4.0%, 5.2% and 3.0% were obtained as voids in the mix. The analysis and cost estimates of test results showed that it would cost N3G5.17 to lay a m3 of asphaltic concrete against N341.70 for hot rolled asphalt. It will cost 84.86 to apply surface dressing on a m2 of road surface