MnROAD cells 16-23 (phase II) : forensic investigation into recycled unbound base and asphalt surface materials.
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2017-06-01
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Abstract:This report presents the findings from an eight-year performance evaluation of eight cells (Cells 16-23) built at the Minnesota Road Research Facility (MnROAD) in 2008. The constructed cells were used for two performance evaluation studies of: 1) unbound base materials (i.e., recycled asphalt pavement (RAP), recycled concrete aggregate (RCA), and taconite) and Class 5 aggregate as the road base material and 2) surface materials that include warm mix additives (WMAs), RAP, and different binders with different performance grades. The eight cells were tested via a surface distress survey, rutting tests, falling weight deflectometer tests, international roughness index (IRI) tests, and friction tests. Disk-shaped compact tension (DCT) tests also were performed using the mixture samples, and the performance of the unbound base materials (Cells 16-19) was evaluated using light-weight deflectometer (LWD), dynamic cone penetrometer (DCP), and gradation tests. After eight years of service (approximately 5.6 million equivalent single-axle loads), the cells remained in good condition in terms of their resistance to surface distresses, rutting, stiffness, IRI values, and friction. Consequently, it was difficult to compare the performance of the various unbound materials and mixtures. The unbound recycled materials and taconite performed as well as the Class 5 aggregate base material in terms of the gradation, DCP, and LWD test results. All mixture types, regardless of RAP content, binder grade, or the presence of WMA, exhibited similar performance.
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