Study of Iowa PCC Thermal Properties for Mechanistic-Empirical Pavement Design

摘要: The present research was designed to determine thermal properties, such as coefficient of expansion (CTE) and conductivity, portland cement concrete (PCC) used in Iowa pavements. These properties are required input values by the AASHTO Mechanistic-Empirical Pavement Design Guide (MEPDG). In this research, a literature survey conducted major factors that significantly affect PCC. CTE tests various lab field samples were performed. variations due test procedure, equipment used, consistency batch materials evaluated. results showed procedure relatively small (<5%), while variation different large (<15%). Concrete affected types coarse aggregate. made with gravel-limestone, quartzite, dolomite, dolomite-limestone, limestone 7.27, 6.86, 6.68, 5.83, 5.69 microstrain/°F (13.08, 12.35, 12.03, 10.50, 10.25 microstrain/°C), respectively, which all higher than default value 5.50 microstrain/oF (9.90 microstrain/°C) MEPDG program. addition, conductivity typical PCC mix an asphalt (ACC) (both aggregate) tested. 9.24 Btu•in/h•ft2•°F (1.33 W/m•K) for 14.52 (2.09 ACC, from (15.0 or 2.16 W/m•K 8.04 1.16 ACC) Results indicated appropriately documenting is essential updating material providing rational pavement design future.