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IMPROVE PERFORMANCE OF ASPHALT CONCRETE OVERLAY BY USING SBR AS MODIFIED | ||
| Al-Qadisiyah Journal for Engineering Sciences | ||
| Article 1, Volume 6, Issue 3, 2013, Pages 247-267 PDF (0 K) | ||
| Authors | ||
| Dr. Riadh A. Abass; Dr. Abdulaziz A. Kifae; Hayder K. Shanbara | ||
| Abstract | ||
| The performance of asphalt concrete pavement depends on the bitumen properties, asphalt concrete mixtures volumetric properties and external factors such as traffic volume and environment.Overlay is one of the quickest preventive maintenance techniques that apply to retard asphalt pavement deterioration and prolonged service lives. This study focuses on prepare good performance and flexible modified thin hot mix asphalt used as an overlay. Styrene-butadiene rubber (SBR) at three contents (3, 6 & 9 % by asphalt weight) were used either alone to modify local asphalt penetration grade 40/50. Properties of modified and unmodified asphalt binder (Penetration, Softening point, Flash point and Ductility) were examined. Performance of modified and unmodified asphalt mixtures was evaluated through Marshall, Indirect Tensile Strength and Wheel Tracking Test. Test results showed that all properties of the base asphalt binder and asphalt mixes were improved by the addition of the modifier. The best improvements in the modified binders and modified mixes were obtained at 6% SBR. Stiffness of modified asphalt mixes were improved at 6% SBR was introduced. Marshall stability was increased by 26% and flow was decreased by 12.5% at 6% SBR. Resistant of the modified asphalt mixes to rutting was increased by 61% at the same modifier content. The three mix types prepared and tested according to Marshall Method. Marshall Stability and Indirect tensile tests were conducted on Marshall specimens. Wheel tracking test were conducted on (50×10×5 cm) AC mix beams. | ||
| Keywords | ||
| AC overlay; Performance; AC modifiers | ||
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