Task 6 : material thermal input for Iowa materials.

Details

• Alternative Title:
  Material thermal input for Iowa materials : task 6 ; Material Thermal Inputs of Iowa Materials for MEPDG
• Creators:
  Wang, Kejin ; Hu, Jiong ; Ge, Zhi
• Corporate Creators:
  Iowa State University. Center for Transportation Research and Education
• Corporate Contributors:
  Iowa. Dept. of Transportation
• Subject/TRT Terms:
  • Compressive strength
  • Strength of materials
  • Elasticity (Mechanics)
  • Elastic analysis
  • Modulus of elasticity
  • Dynamic modulus of elasticity
  • Regression analysis
  • Statistical analysis
  • Shrinkage
  • Tensile strength
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• Publication/ Report Number:
  CTRE Project 06-272
• Resource Type:
  Tech Report
• Geographical Coverage:
  Iowa
• Edition:
  Final report.
• Corporate Publisher:
  Iowa State University. National Concrete Pavement Technology Center
• 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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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/24333/dot_24333_DS1.pdf
• File Type:
  [PDF - 4.59 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:b0595919561c2350320028982028275ddb7f5102d10c5a72720e661c5df7740de3c20050ef844892156bc77d4b00527374baf17d17a4caa03bf6432c98886f79