Journal Published Online: 22 June 2018
Volume 47, Issue 1

Poisson’s Ratio of Asphalt Concrete Mixes Using Indirect Tensile Test

CODEN: JTEVAB

Abstract

Increased interest in mechanistic evaluation of flexible pavement structures has brought a demand for accurate and practical methods, models, or both to estimate the mechanical properties of asphalt concrete mixtures. One of these properties is the Poisson’s ratio (ν) of asphalt concrete mixtures, which is often assumed to have a constant value of 0.35 in asphalt concrete evaluations. However, investigations have reported that mixture type, air void content, and temperature produce considerable variation in measured ν-values that could have a significant effect on evaluations of asphalt concrete mixes. The objective of this study was to evaluate the effect of air voids, binder type, and testing conditions on the measured ν-values. Indirect tensile (IDT) tests were conducted to measure ν-values. The study indicated that the Poisson’s ratio of the asphalt concrete mixes, on average, attained a maximum value at a particular level of air void content. Furthermore, when comparing the Poisson’s ratio values in relation to the dynamic modulus, calculated using the Mechanistic Empirical Pavement Design Guide (MEPDG) equation, higher ν-values were attained. This demonstrates the importance of measuring the Poisson’s ratio of a mix type.

Author Information

Lindelöf, Peter
Department of Technology and Society, Lund University, Lund, Sweden
Said, Safwat
Swedish National Road and Transport Research Institute, Highway Engineering, Linköping, Sweden
Ahmed, Abubeker
Swedish National Road and Transport Research Institute, Highway Engineering, Linköping, Sweden
Pages: 13
Price: $25.00
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Stock #: JTE20170516
ISSN: 0090-3973
DOI: 10.1520/JTE20170516