ISSN: 0090-3973
Page Count: 10

Determining Asphalt Concrete Properties via the Impact Resonant Method
Whitmoyer, SL
Graduate research assistant and assistant professor, North Carolina State University, NC

Kim, YR
Graduate research assistant and assistant professor, North Carolina State University, NC

(Received 12 April 1993; accepted 4 October 1993)

Abstract

Various publications have demonstrated that the results from the resilient modulus test (see ASTM D 4123, Method for Indirect Tension Test for Resilient Modulus of Bituminous Mixtures) display a wide range of variability. Considering this, an alternate testing method that produced more consistent results with a simpler test setup was pursued. A standardized vibrational test procedure for Portland cement concrete (ASTM C 215, Test Method for Fundamental Transverse, Longitudinal, and Torsional Frequencies of Concrete Specimens) was modified to measure the material properties of asphalt concrete. The impact resonant method provided three separate, independent tests, two measuring the elastic modulus and one the shear modulus. Poisson's ratio was obtained by comparing moduli results. Unlike the semi-nondestructive nature of the resilient modulus test, the impact resonant method was a true non-destructive test. The method also allowed for a possible laboratory link to nondestructive analysis of in-situ pavement. Experimental test results demonstrated that the impact resonant method provided precise and reproducible results. Further experiments revealed that the impact resonant method could detect different magnitudes of microcrack healing.

Keywords:
impact resonant method, resilient modulus, stress wave analysis, asphalt concrete, nondestructive test

Paper ID: JTE12648J
DOI: 10.1520/JTE12648J
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