Abstract
The Louisiana Department of Transportation and Development (DOTD) and other state agencies are continuously looking for techniques to reduce roadway maintenance and construction costs. A common consideration is to introduce asphalt mixtures with a smaller nominal maximum aggregate size (NMAS) for utilization in roadways. In a previous study, DOTD concluded that mixtures with a 4.75 mm NMAS provided acceptable performance as a surface layer. Excessive stockpiles of unused smaller aggregates can result in an economically competitive source to be consi dered for asphalt mixtures. The DOTD developed mixtures with four aggregate types and two binder types. A comprehensive evaluation of performance was conducted through volumetric and mechanistic testing. Performance testing consisted of the Loaded Wheel Tracking (LWT) test to determine rutting resistance, Semi-Circular Bend (SCB) test to evaluate intermediate temperature cracking resistance, and dynamic modulus (E*) to ascertain the stiffness at intermediate temperatures. As expected, asphalt binder grade, aggregate type and mixture composition affected the performance of mixtures evaluated. Gravel mixtures were susceptible to cracking, while limestone mixtures were susceptible to rutting. An economic analysis was conducted to determine the viability of 4.75 mm mixtures. The cost per ton of 4.75 mm mixtures in Louisiana was higher than conventional 12.5 mm mixtures. However, when considering the lift thickness of potential overlays, the 4.75 mm aggregate mixtures became more viable. Further, a life-cycle analysis of a designed pavement using AASHTO Pavement-ME was performed to compare the lifetime durability of the 4.75 mm NMAS mixtures to a conventional 12.5 mm mixture.
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The authors would like to acknowledge the supports provided by Louisiana Transportation Research Center (LTRC).
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This study was supported by the Louisiana Transportation Research Center (LTRC).
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The authors confirm contribution to the paper as follows: study conception and design: Saman Salari, Samuel Cooper, Louay Mohammad, Peyman Barghabany; data collection: Saman Salari, Samuel Cooper, and Peyman Barghabany; analysis and interpretation of results: Saman Salari, Samuel Cooper, and Peyman Barghabany; draft manuscript preparation: Saman Salari, Samuel Cooper, Peyman Barghabany, Louay Mohammad. All authors reviewed the results and approved the final version of the manuscript.
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Salari, S., Cooper, S., Mohammad, L.N. et al. Development of a 4.75 mm asphalt mixture design for Implementation in Louisiana DOTD Specifications. Int. J. Pavement Res. Technol. 13, 637–644 (2020). https://doi.org/10.1007/s42947-020-6014-5
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DOI: https://doi.org/10.1007/s42947-020-6014-5