Development of High RAP–High Performance Thin-Lift Overlay Mix Design Using a Soybean Oil-Derived Rejuvenator

Podolsky, Joseph H.; Sotoodeh-Nia, Zahra; Manke, Nicholas; Hohmann, Austin; Huisman, Theodore; Williams, R. Christopher; Cochran, Eric W.

doi:10.1061/(asce)mt.1943-5533.0003203

Cited by 9 publications

(1 citation statement)

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“…These things considered, fine-graded mixes generally improve the quality of THMAO in many ways; for example, by making it extremely dense and impermeable, while being highly flexible and crack resistant [ 69 ]. According to a recent laboratory study by Podolsky et al [ 63 ], it was shown that a large amount of fine-graded RAP (40%) and a regenerating agent (>8% of the total mix) can improve the resistance of THMAO mixes to low-temperature fracture, fatigue cracking, and rutting damage. Other properties of THMAO mixes, including their stiffness and resistance to reflection cracking, have also been reported to be improved by the addition of large amounts of RAP [ 66 ].…”

Section: State Of the Artmentioning

confidence: 99%

Maximizing the Application of RAP in Asphalt Concrete Pavements and Its Long-Term Performance: A Review

et al. 2022

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The use of recycled asphalt pavement (RAP) materials in asphalt concrete pavements (ACP) brings significant cost and environmental benefits. In practice, however, the amount of RAP readily available far exceeds the amount being utilized in ACPs, which still leaves the problem of excess RAP in the environment partially solved. Additionally, ACPs containing RAP materials (i.e., RAP-ACPs) can still be landfilled after they have reached the end of their useful life, which may restore the original environmental waste problem. To address these, researchers have demonstrated different ways to maximize the application of RAP in ACPs. Among them, the use of RAP in pavement preventive maintenance (PPM) treatments and the repeated recycling of RAP-ACPs (i.e., RnAP) are specifically discussed in this review. It is envisaged that, by promoting these two practices, the application and benefits of RAP can be further maximized to improve sustainability. This review also discusses the long-term behavior of RAP-ACP, which is crucial to inspire confidence in the wider application of RAP in ACP. Studies on RAP-PPM have shown that virgin PPM treatments can successfully accommodate RAP materials by adjusting their mix design. So far, research on RnAP has been limited to how multiple-recycling affects the performance properties of the blends, showing improvements in rutting resistance and moisture susceptibility but little effect on linear viscoelasticity and cracking. Overall, the lack of sufficient research is considered to be the biggest challenge in facilitating the implementation of these two sustainable RAP technologies. Little or nothing is known about the bonding mechanisms between RAP and fresh PPM binders, the molecular and chemical changes in RnAP binders, or the functional performance characteristics, actual pavement performance, and long-term performance of both RAP-PPM and RnAP blends. An understanding of these aspects is very relevant to maximize and continue the beneficial reuse of RAP in ACPs while safeguarding human and environmental health.

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Section: State Of the Artmentioning

confidence: 99%