Details:

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:
[+]
Compressive Strength Dynamic Modulus Of Elasticity Elastic Analysis Elasticity (Mechanics) Elastic Modulus Mechanistic Design MEPDG Modulus Of Elasticity Modulus Of Rupture Pavement Design Portland Cement Concrete Regression Regression Analysis Shrinkage Splitting Tensile Strength Statistical Analysis Strength Of Materials Tensile Strength
Publication/ Report Number:
CTRE Project 06-270
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 identify the typical Iowa material input values that are required by the Mechanistic-

Empirical Pavement Design Guide (MEPDG) for the Level 3 concrete pavement design. It was also designed to investigate the existing

equations that might be used to predict Iowa pavement concrete for the Level 2 pavement design.

In this project, over 20,000 data were collected from the Iowa Department of Transportation (DOT) and other sources. These data, most

of which were concrete compressive strength, slump, air content, and unit weight data, were synthesized and their statistical parameters

(such as the mean values and standard variations) were analyzed. Based on the analyses, the typical input values of Iowa pavement

concrete, such as 28-day compressive strength (f’c), splitting tensile strength (fsp), elastic modulus (Ec), and modulus of rupture (MOR),

were evaluated. The study indicates that the 28-day MOR of Iowa concrete is 646 + 51 psi, very close to the MEPDG default value (650

psi). The 28-day Ec of Iowa concrete (based only on two available data of the Iowa Curling and Warping project) is 4.82 + 0.28x106 psi,

which is quite different from the MEPDG default value (3.93 x106 psi); therefore, the researchers recommend re-evaluating after more

Iowa test data become available. The drying shrinkage (εc) of a typical Iowa concrete (C-3WR-C20 mix) was tested at Concrete

Technology Laboratory (CTL). The test results show that the ultimate shrinkage of the concrete is about 454 microstrain and the time

for the concrete to reach 50% of ultimate shrinkage is at 32 days; both of these values are very close to the MEPDG default values. The

comparison of the Iowa test data and the MEPDG default values, as well as the recommendations on the input values to be used in

MEPDG for Iowa PCC pavement design, are summarized in Table 20 of this report.

The available equations for predicting the above-mentioned concrete properties were also assembled. The validity of these equations for

Iowa concrete materials was examined. Multiple-parameters nonlinear regression analyses, along with the artificial neural network

(ANN) method, were employed to investigate the relationships among Iowa concrete material properties and to modify the existing

equations so as to be suitable for Iowa concrete materials. However, due to lack of necessary data sets, the relationships between Iowa

concrete properties were established based on the limited data from CP Tech Center’s projects and ISU classes only. The researchers

suggest that the resulting relationships be used by Iowa pavement design engineers as references only.

The present study furthermore indicates that appropriately documenting concrete properties, including flexural strength, elastic modulus,

and information on concrete mix design, is essential for updating the typical Iowa material input values and providing rational

prediction equations for concrete pavement design in the future.


Format:
PDF
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:d008e116ad77281f1fddedf6fb5853c6f1d4afb68d5e30f2c73ab490125fc50c
Download URL:
https://rosap.ntl.bts.gov/view/dot/24341/dot_24341_DS1.pdf
File Type:

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