Task 6 : material thermal input for Iowa materials.
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Task 6 : material thermal input for Iowa materials.

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    • Alternative Title:
      Material thermal input for Iowa materials : task 6 ; Material Thermal Inputs of Iowa Materials for MEPDG ;
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      Final report.
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    • Abstract:
      The present research project was designed to determine thermal properties, such as coefficient of thermal expansion

      (CTE) and thermal conductivity, of Iowa concrete pavement materials. These properties are required as input values by

      the Mechanistic-Empirical Pavement Design Guide (MEPDG).

      In this project, a literature review was conducted to determine the factors that affect thermal properties of concrete and the

      existing prediction equations for CTE and thermal conductivity of concrete. CTE tests were performed on various lab and

      field samples of portland cement concrete (PCC) at the Iowa Department of Transportation and Iowa State University. The

      variations due to the test procedure, the equipment used, and the consistency of field batch materials were evaluated.

      The test results showed that the CTE variations due to test procedure and batch consistency were less than 5%, and the

      variation due to the different equipment was less than 15%. Concrete CTE values were significantly affected by different

      types of coarse aggregate. The CTE values of Iowa concrete made with limestone+graval, quartzite, dolomite,

      limestone+dolomite, and limestone were 7.27, 6.86, 6.68, 5.83, and 5.69 microstrain/oF (13.08, 12.35, 12.03, 10.50, and

      10.25 microstrain/oC), respectively, which were all higher than the default value of 5.50 microstrain/oF in the MEPDG

      program. The thermal conductivity of a typical Iowa PCC mix and an asphalt cement concrete (ACC) mix (both with

      limestone as coarse aggregate) were tested at Concrete Technology Laboratory in Skokie, Illinois. The thermal

      conductivity was 0.77 Btu/hr•ft•oF (1.33 W/m•K) for PCC and 1.21 Btu/hr•ft•oF (2.09 W/m•K) for ACC, which are

      different from the default values (1.25 Btu/hr•ft•oF or 2.16 W/m•K for PCC and 0.67 Btu/hr•ft•oF or 1.16 W/m•K for

      ACC) in the MEPDG program. The investigations onto the CTE of ACC and the effects of concrete materials (such as

      cementitious material and aggregate types) and mix proportions on concrete thermal conductivity are recommended to be

      considered in future studies.

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