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Evaluation of FC-5 with PG 76-22 HP to Reduce Raveling
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Evaluation of FC-5 with PG 76-22 HP to Reduce Raveling
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    Final Report, November 2016–May 2019
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    The objectives of this project were to assess the mechanical performance and durability of open-graded friction course FC-5 mixtures fabricated with a highly polymer-modified (HP) binder (that complied with the requirements of FDOT specifications, Section 916-2), compare the results with those obtained in mixtures fabricated with a conventional polymer-modified asphalt (PMA) binder, and evaluate whether the use of HP binders was a cost-effective alternative to enhance the durability of FC-5 mixtures. The project included a comprehensive experimental plan, as well as computational mechanical simulations in finite elements (FEs) and a life-cycle cost analysis (LCCA). The experimental plan included linear viscoelasticity (LVE), surface free energy (SFE), fatigue cracking, and creep recovery tests on both types of binders under different aging conditions; LVE properties and the SFE of mastics fabricated with both binders and two aggregate types (i.e., limestone and granite); and fracture and durability tests on FC-5 mixtures fabricated with a combination of two binders and two aggregates under different aging conditions. The results showed that the PMA binder and PMA mastics had better LVE properties than the HP binder and mastics. However, the HP binder and HP mastics had superior fatigue cracking and creep recovery in all aging states. The fracture tests conducted on the FC-5 mixtures corroborated these results, and the durability tests—which were conducted using the Cantabro test with multiple cycles—also demonstrated that FC-5 mixtures with HP binder were significantly more durable than those with PMA binder. Numerical FE simulations conducted in a long-term aging state indicated that FC-5 mixtures with HP binder were less prone to raveling under field operational conditions, and the LCCA showed that the extended service life of FC-5 mixtures with HP binder offered a cost-effective alternative.

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