JETI Admin2
Abstract
In this research, 60/70 penetration grade bitumen was modified by adding crumb rubber to partially replace 12.5mm and 9.5mm aggregate sizes in 2%, 4%, 6%, 8%, and 10% of the aggregate content weight determined by Marshall Method following the dry process. The results of the density, stability, flow, voids in the total mix, voids filled bitumen, and void in the mixed aggregate from the modified samples and control sample were compared and analyzed. Values of properties of the conventional asphalt concrete (bulk density 2.36kN/mm, VTM 3.8%, VMA 18.1%, VFB 79.2%, stability 9.1kN and flow 4.2mm) and crumb rubber modified asphalt concrete (bulk density 2.35kN/mm, VTM 3.7%, VMA 18.0%, VFB 79.4%, stability 3.9kN and flow 4.0mm) at the optimum crumb rubber content are close except for the stability of conventional asphalt concrete which is higher. Still, the crumb rubber-modified asphalt concrete has a better flow value, and the stability is within the Nigeria specification for roads and bridges.
References
[1] Onyango F., Salim R. W., M. Ndege, L. Masu, Effect of Rubber Tyre and Plastic Wastes Use in Asphalt Concrete Pavement, World Academy of Science, Engineering, and Technology International Journal of Civil, Environmental, Structural, Construction and Architectural Engineering, (9)11 (2015) 1382-1386.
[2] Mohamed, S., Maciej, S., and Jozef, H., Asphalt Pavement Material Improvement: A Review. International Journal of Environmental Science and Development, 5(5). (2014)
[3] Chris D.R., What are the Environmental Impacts of Throwing Away Tyres? (2009). [Online] Available: http://homeguides.sfgate.com/environmental-impacts-throwing-away-tires-79649.html.
[4] Bahia H.U., and Davies R., Effect of Crumb Rubber Modifiers (CRM) on Performance-Related Properties of Asphalt Binders. Journal of the Association of Asphalt Paving Technologists (1994), Volume: 63, pp. 414-449.
[5] Nabin, R.M., A Study on the Performance of Crumb Rubber Modified Bitumen by Varying the Sizes of Crumb Rubber. International Journal of Engineering Trends and Technology (IJETT) Centre for Transportation, Civil Engineering Department, JNTUH, Hyderabad, Telangana, India., 14(2) (2014).
[6] Ogundipe O. M., Aboloye O. C., and Fatuase S. O., Evaluation of the Properties of Asphalt Concrete Modified with Crumb Rubber Using Marshall Test. Proceedings of the 9th International Conference on Maintenance and Rehabilitation of Pavements—Mairepav9, Lecture Notes in Civil Engineering 76, (2020) 469-478. https://doi.org/10.1007/978-3-030-48679-2_44
[7] Huang B., Mohammad L., Graves P. and Abadie C., Louisiana Experience with Crumb Rubber-Modified Hot-Mix Asphalt Pavement. Transportation Research Record: Journal of the Transportation Research Board, (2002). Volume1789. DOI: 10.3141/1789-01.