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 Dynamic Modulus Of Elasticity Elastic Analysis Elasticity (Mechanics) Mechanistic Design MEPDG Modulus Of Elasticity Pavement Design Portland Cement Concrete Regression Analysis Shrinkage Statistical Analysis Strength Of Materials Tensile Strength Thermal Conductivity Thermal Properties Coefficient Of Thermal Expansion (CTE)

  More +
• 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.
  
  
• Format:
  PDF
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:b0595919561c2350320028982028275ddb7f5102d10c5a72720e661c5df7740de3c20050ef844892156bc77d4b00527374baf17d17a4caa03bf6432c98886f79
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/24333/dot_24333_DS1.pdf
• File Type:
  [PDF - 4.59 MB ]