Details:

Creators:
Bennert, Thomas
Corporate Creators:
Rutgers University. Center for Advanced Infrastructure and Transportation
Corporate Contributors:
New Jersey Department of Transportation
Subject/TRT Terms:
[+]
Asphalt--Testing Dynamic Modulus Of Elasticity Hot Mix Asphalt Pavements, Flexible--Design And Construction
Publication/ Report Number:
FHWA-NJ-2009-011
Resource Type:
Tech Report
Geographical Coverage:
New Jersey
Edition:
Final report; Jan. 2007-June 2009.
Corporate Publisher:
New Jersey. Dept. of Transportation
Abstract:
One of the most critical parameters needed for the upcoming Mechanistic Empirical Pavement Design Guide

(MEPDG) is the dynamic modulus (E*), which will be used for flexible pavement design. The dynamic modulus

represents the stiffness of the asphalt material when tested in a compressive-type, repeated load test. The

dynamic modulus is one of the key parameters used to evaluate both rutting and fatigue cracking distresses in

the MEPDG. The computer software that accompanies the MEPDG also provides general default parameters for

the dynamic modulus (i.e. – Level 2 and 3 inputs). However, caution has already been issued by the National

Cooperative Highway Research Program (NCHRP) researchers as to the appropriateness of these parameters

for regional areas. The major concern is that state agencies will use these default values blindly and sacrifice

accuracy of the design. Hence, making the new mechanistic procedure no better than using a structural number

(SN) with the old AASHTO method.

There were three primary objectives of the research study. First, the current version of the dynamic modulus

test, AASHTO TP62-07, was evaluated to determine the relative precision of the test method, and if required,

recommend a modified procedure with better precision. The second objective of the study was to develop a

dynamic modulus catalog for use with the Mechanistic Empirical Pavement Design Guide (MEPDG) by testing

plant-produced and laboratory-compacted samples of various asphalt mixtures. This would supercede Level 2

inputs currently in the MEPDG for New Jersey. The third primary objective of the research study was to assess

the accuracy of two commonly utilized dynamic modulus prediction equations; 1) Witczak Prediction Equation

and 2) Hirsch Model. The database developed during the study also led to the development of correlations

between dynamic modulus and fatigue cracking and rutting performance of asphalt mixtures.


Format:
PDF
Collection(s):
US Transportation Collection University Transportation Centers
Main Document Checksum:
[+]
urn:sha256:5cbfa2e4e18421079d439158f71b7276c863b2cb1c840c18aa4209e2ac17959b
Download URL:
https://rosap.ntl.bts.gov/view/dot/17674/dot_17674_DS1.pdf
File Type:

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