Main Article Content
Abstract
There is a need to improve the performance of asphalt binders to minimize stress cracking that occurs at low temperatures and plastic deformation at high temperatures. Importation of used asphalt-polymers from abroad, leads to an increase in the total construction cost as compared to the cost if the used polymers were of local origin. The main objective of this research was to modify locally produced asphalt. Ten polymers were identified as potential asphalt modifiers based on their physical properties and chemical composition. After preliminary laboratory evaluation for the melting point of these polymers, five polymers were selected for local asphalt modification. In the initial stage, required mixing time was decided based on the relation between shear loss modulus and mixing time .The optimum polymer content was selected based on Superpave binder performance grade specifications.The suitability of improvement was verified through the evaluation of permanent deformation and fatigue behavior of laboratory prepared asphalt concrete mixes. The results indicated that the rheological properties of the modified binders improved significantly with sufficient polymer content (3%). The aging properties of the modified binders were found to be dependent on the type of polymer.The fatigue life and resistance to permanent deformation were significantly improved due to enhanced binder rheological properties. Thus, local asphalts can be modified using thermoplastic polymers.
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References
- A1-Abdul Wahhab, H., and Al-Amri, G., 1991,“Laboratory Evaluation of
- Reclaimed Rubber
- Asphaltic Concrete Mixes,” ASCE Journal of Materials, 3 (3), pp. 189-203.
- A1-Abdul Wahhab, H., Ali, F., Asi, I., and Al-Dhubeeb,I.,1996,“Adaptation of SHRP Performance Based Asphalt Specifications to the Gulf Countries,” Final Report, King Abdulaziz City for Science and Technology (KACST), Riyadh.
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- Baig, M..,, and Al-Abdul Wahhab, H., 1998, “Mechanistic Evaluation of Hedmanite and Lime Modified Asphalt Concrete Mixes,” ASCE Journal of Materials, 10 (3), pp. 153-160.
- Bouldin, M.G. et al., 1991, “Rheology and Microstructure of Polymer/Asphalt Blends,” Journal of Rubber Chemistry and Technology,67(4).
- Harrigan, E.T. et al. (Editor), 1994, “The SUPERPAVE Mix Design System Manual of Specifications, Test Methods, and Practices,” SHRP-A-379,National Research Council, Washington, D.C.
- Isacsson, U.,. and Lu, X., 1999, “Modified Asphalt Pavement Materials The European Experience,”Proceedings, AAPT, Vol. 68 p. 35.
- Khattak, M.J., and Baladi, G.Y., 2001, “Paving Asphalt Polymer Blends:Relationships between Composition, Structure and Properties,”TRB 10, No.01-2813, 80th Transportation Research Board Annual Meeting,Washington, D.C.
- Sartori, F., Bonemazzi, F., Bbraga, V., and Corrieri,R.,1996,“Characteristic of Polymers and Polymer Modified Binders,” TRR No. 1535, Transportation Research Record , Washington,D.C.
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References
A1-Abdul Wahhab, H., and Al-Amri, G., 1991,“Laboratory Evaluation of
Reclaimed Rubber
Asphaltic Concrete Mixes,” ASCE Journal of Materials, 3 (3), pp. 189-203.
A1-Abdul Wahhab, H., Ali, F., Asi, I., and Al-Dhubeeb,I.,1996,“Adaptation of SHRP Performance Based Asphalt Specifications to the Gulf Countries,” Final Report, King Abdulaziz City for Science and Technology (KACST), Riyadh.
Anderton, G.L., 1991, “Modified Asphalt Binders for Military Airfield Pavement,” Proceedings, AAPT, Vol.60.
Bahia, H., Hanson, D.I., Zeng, M., Zhai, H., Khatri, M., and Anderson, R (2001), “Characterization of Modified Asphalt Binder in Superpave Mix Design,” NCHRP Report 459, National Academy Press, Washington, D.C.
Baig, M..,, and Al-Abdul Wahhab, H., 1998, “Mechanistic Evaluation of Hedmanite and Lime Modified Asphalt Concrete Mixes,” ASCE Journal of Materials, 10 (3), pp. 153-160.
Bouldin, M.G. et al., 1991, “Rheology and Microstructure of Polymer/Asphalt Blends,” Journal of Rubber Chemistry and Technology,67(4).
Harrigan, E.T. et al. (Editor), 1994, “The SUPERPAVE Mix Design System Manual of Specifications, Test Methods, and Practices,” SHRP-A-379,National Research Council, Washington, D.C.
Isacsson, U.,. and Lu, X., 1999, “Modified Asphalt Pavement Materials The European Experience,”Proceedings, AAPT, Vol. 68 p. 35.
Khattak, M.J., and Baladi, G.Y., 2001, “Paving Asphalt Polymer Blends:Relationships between Composition, Structure and Properties,”TRB 10, No.01-2813, 80th Transportation Research Board Annual Meeting,Washington, D.C.
Sartori, F., Bonemazzi, F., Bbraga, V., and Corrieri,R.,1996,“Characteristic of Polymers and Polymer Modified Binders,” TRR No. 1535, Transportation Research Record , Washington,D.C.
Wegan, V., and Brule, B., 1999, “Polymer Modified Asphalt Cements Used in the Road Construction Industry,” Proceedings, AAPT, Vol. 68, p. 64.