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
Wang, Kejin ; Hu, Jiong ; Ge, Zhi Less -
Corporate Creators:
Iowa State University. Center for Transportation Research and Education
Corporate Contributors:
Iowa. Dept. of Transportation
Subject/TRT Terms:
[+]
Coefficient Of Thermal Expansion (CTE) 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
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:sha256:79ecd28169145e8fff7f59dc465d71c8cf3c18a1dfdac83b731bd48af71ccf32
Download URL:
https://rosap.ntl.bts.gov/view/dot/24333/dot_24333_DS1.pdf
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