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The contents of this report reflect the views of the author(s), who is responsible for the facts and the accuracy of the data presented herein. The contents do not necessarily reflect the official views or policies of the Virginia Department of Transportation, the Commonwealth Transportation Board, or the Federal Highway Administration. This report does not constitute a standard, specification, or regulation. Any inclusion of manufacturer names, trade names, or trademarks is for identification purposes only and is not to be considered an endorsement.


Relationship of Fatigue to the Tensile Stiffness of Asphaltic Concrete
G. W. Maupin, Jr.
Year: 1972
VTRC No.: 70-R41
Abstract: The correlation between asphaltic concrete tensile stiffness and fatigue life was determined in the laboratory. Constant strain fatigue tests were utilized and indirect tensile tests were selected because of their simplicity and applicability. Four asphaltic concrete mixes of different stiffnesses were tested under constant strain fatigue and indirect tension. Each mix was fatigue tested at several strain levels in order that a strain fatigue life relationship could be developed. This enabled the correlation of tensile stiffness and fatigue life at any of the strain levels used in the tests. A correlation between tensile stiffness and fatigue life was plotted at a 150 x 10-6 in./in. strain level. The information gathered indicates that it may be possible to predict the fatigue susceptibility of a mixture with a simple indirect tension test. The fatigue life of a surface mixture was reduced by artificial aging and was altered by using asphalt cements of different hardnesses.