Browsing by Author "Roy, Souvik"
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Item Performance Benefits of Fiber-Reinforced Thin Concrete Pavement and Overlays(Minnesota Department of Transportation, 2021-07) Barman, Manik; Roy, Souvik; Tiwari, Amarjeet; Burnham, TomThis study investigates the performance benefits of synthetic structural fibers in mitigating distresses in thin concrete pavements and overlays. In this study, two ultra-thin (3 and 4 inches thick) and four thin (5 and 6 inches thick) concrete pavements placed on a gravel base along with two thin unbonded concrete overlay cells (5 inches thick) placed on an existing concrete pavement were constructed at the Minnesota Road Research (MnROAD) facility in 2017. This report discusses the objectives and methodology of the research, including the construction of the test cells, instrumentation, traffic load application, and data collection and analysis procedures. The structural responses and distresses observed over three years, such as fatigue cracking and faulting, as well as the joint performance measured in each cell, were discussed and compared in this report.Item Synthetic Macro-Fibers for Mitigating Distresses in Thin Concrete Pavements(2021-07) Roy, SouvikApplication of Fiber Reinforced Concrete (FRC) in constructing concrete pavement overlaysand new concrete pavements is gaining more attention. However, there has been limited research on quantifying the performance benefits of fiber and its dosage in concrete pavements, specifically in thin concrete pavements. The present study focused on determining the influence of synthetic macro-fibers in keeping the joint performance high for a longer duration of pavement service life and in mitigating thin concrete pavement distresses such as transverse joint faulting and fatigue cracking. Field data was collected from fiber reinforced in-service test sections at the MnROAD test facility, located on I-94 westbound, 35 miles north-west of the twin cities metropolitan area, Minnesota. Field data included, falling weight deflectometer (FWD), environmental strain, transverse joint faulting, international roughness index (IRI), and crack survey data. It was found that joint performance was significantly affected by the inclusion of fibers. High fiber dosage resulted in greater LTE, lower differential displacement, and lower loaded-side displacement. A faulting prediction equation was proposed on the basis of faulting data and statistical relationships. A relationship was also established between the joint faulting and IRI. The distress data analysis indicated that fatigue cracking may not be the dominant distress of the thin fiber reinforced pavements, but the transverse joint faulting is.