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Document Type |
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Thesis |
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Document Title |
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EVALUATION OF ASPHALT BINDERS AND MIXES CONTAINING RECLAIMED ASPHALT PAVEMENT WITH REJUVENATORS تقييم مواد الربط و الخلطات الإسفلتية المحتوية على مواد رصف معاد استخدامها و المحسنة بالمحفزات |
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Subject |
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Faculty of Engineering |
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Document Language |
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Arabic |
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Abstract |
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Reclaimed asphalt pavement (RAP), which is produced from the milling of old asphalt pavement, is one of the most widely recycled materials in the world. Asphalt mixtures that contain a lower percentage of RAP can perform similarly to conventional mixtures. However, a high RAP percentage in producing hot asphalt mixtures is limited due to the adverse effect it has on the mixture’s properties. To overcome this adverse effect, it is necessary to rejuvenate the aged binder.
This study objective is to determine the effect of rejuvenators on the properties of RAP recovered binder. Two vegetable-based rejuvenators, soybean (SOY) and sunflower (SnF), were used at doses of 3 and 6% by weight to rejuvenate recovered RAP binders. Laboratory tests on the binder included penetration, softening point, loss on heating, Dynamic Shear Rheometer (DSR), and Bending Beam Rheometer (BBR).
The results from the tests indicated that with the rejuvenator addition, the penetration of RAP recovered binders increased while the softening points decreased. In addition, the viscosity of recovered RAP binders was reduced when rejuvenating agents are used. DSR results showed that the rejuvenator percentage significantly affected the complex modulus of rejuvenated recovered binders at high temperatures; however, the type of rejuvenator did not significantly affect the asphalt binder complex modulus. At intermediate temperatures, binder results showed a statistically significant effect of rejuvenator percentages and rejuvenated types on complex modulus values. BBR test results showed that low-temperature creep stiffness was statistically significant for both rejuvenator type and rejuvenator percentage. In addition, a higher low-temperature resistance was found in the RAP recovered binder with a 6% rejuvenator.
To verify that the rejuvenated paving mixture complies with the requirements of the Saudi Ministry of Municipality and Rural Affairs (MMRA), the effects of the rejuvenated binders were assessed on Marshall Mix Design properties and moisture damage resistance. Results showed that all paving mixtures with rejuvenated RAP binders met the MMRA specification.
Keywords: (Reclaimed Asphalt Pavement, Asphalt Rejuvenator, Rheological Tests, Asphalt Mixture) |
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Supervisor |
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Dr. Shaher Zahran Zahran |
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Thesis Type |
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Doctorate Thesis |
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Publishing Year |
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1445 AH
2023 AD |
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Added Date |
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Wednesday, October 25, 2023 |
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Researchers
| کمال الدين کمال | Kamal, Kamaluddin | Researcher | Doctorate | |
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