United States Department of Transportation
i
Development of Concrete Material Property Database for Pavement ME Input
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2021-02-01
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[PDF-7.05 MB]
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Edition:Final Report (Oct. 2018–Feb. 2021
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Abstract:The Georgia Department of Transportation (GDOT) has been moving toward using the Mechanistic–Empirical Pavement Design Guide (MEPDG), which deploys mechanistic and mathematical principles to analyze the material behaviors. For the smooth transition to this updated pavement design approach for rigid pavement design, GDOT has been developing a statewide database of concrete mixture properties to select appropriate input variables and levels for rigid pavement designs, which are consistent with the level of importance required for specific pavement design projects. The key mechanical inputs for rigid pavement design in the MEPDG are compressive strength (????′), modulus of elasticity (MOE), and modulus of rupture (MOR). In addition to these mechanical properties, the MEPDG requires thermal properties inputs, such as the coefficient of thermal expansion (CTE), portland cement concrete (PCC) heat capacity, thermal conductivity, % reversible shrinkage, days to develop 50% of ultimate shrinkage, and ultimate shrinkage. This study aims to develop the aforementioned concrete materials database specific to Georgia’s rigid pavements. For this study, twelve (12) GDOT-approved concrete mixtures using Georgia-specific concrete materials were batched, tested, and analyzed for these properties. The study investigates which of these properties are most critical in rigid pavement design through sensitivity analysis conducted with AASHTOWare Pavement ME Design at input levels 1, 2, and 3. With the measured mechanical and thermal properties as a part of the GDOT RP 18-03 study, the relationships among the concrete materials properties and the performance of rigid pavement were further investigated to better understand their interrelationship. Ultimately, this study provides design recommendations for critical mechanical and thermal properties, as well as guidance for which input level to use for the design of Georgia rigid pavements.
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