Improving Asphalt Binder’s Elasticity through Controlling the Interaction Parameters between CRM and Asphalt Binder
Crumb rubber modifier (CRM) is considered one of the most commonly used modifiers that enhances the rheological properties of asphalt binders. Optimizing the interaction process between CRM and asphalt binder to enhance the asphalt binder’s elasticity without additional additives is the main purpose of the article. Rheological properties were measured in this article for neat asphalt and crumb rubber modified asphalt (CRMA) binders. Two sets of interactions were selected. In the first interaction set, one interaction temperature (190°C), one interaction speed (3,000 rpm), and different interaction times (0.5, 1, 2, 4, and 8 h)were used. The used CRM percentage was 10 % by weight of the neat asphalt binder. Two sources of asphalt binder, one source and different percentages of CRM, one interaction temperature (190°C), one interaction speed (3,000 rpm), and different interaction times were selected for the second interaction set. This set was designated to confirm the rheological properties obtained for the first set. Thermogravimetric analysis (TGA) was performed on CRM particles before and after their interaction with asphalt binder after different interaction times. The CRMA binders that interacted for the entire 8-h interaction times had significantly enhanced properties, especially the elasticity, as compared to the neat asphalt binder. The 8-h interaction time showed the highest CRM dissolution percentage by dissolution and TGA testing. At this interaction time, more CRM components were released into the asphalt binder liquid phase, which was detected by observing Fourier-transform infrared peaks at 966 cm−1 for polypropylene and 699 cm−1 for polystyrene.
E. Deef-Allah et al., "Improving Asphalt Binder’s Elasticity through Controlling the Interaction Parameters between CRM and Asphalt Binder," Advances in Civil Engineering Materials, vol. 9, no. 1, pp. 262-282, ASTM International, May 2020.
The definitive version is available at https://doi.org/10.1520/ACEM20190204
Civil, Architectural and Environmental Engineering
Keywords and Phrases
Elasticity; Crumb Rubber Modifier; Multiple Stress Creep Recovery; Master Curve; Thermogravimetric Analysis; Rutting; Fatigue Cracking; Thermal Cracking
International Standard Serial Number (ISSN)
Article - Journal
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13 May 2020