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An Algorithm to Estimate Rational Values of Phase Angles and Moduli of Asphalt Mixtures
KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering. Swedish National Road and Transport Research Institute (VTI).
Department of Civil Engineering Indian Institute of Technology Kharagpur .
Swedish National Road and Transport Research Institute (VTI).
2013 (English)In: International Journal of Pavement Research and Technology (IJPRT), Vol. 6, no 6, 745-754 p.Article in journal (Refereed) Published
Abstract [en]

The objective of this study was to develop and evaluate an algorithm based on Fast Fourier Transform (FFT) that can calculate rational values of phase angle (f) and moduli of the variants of asphalt mixtures for the data obtained from the different frequency sweep tests. f and moduli for ten different asphalt mixtures resulting in over 690 data points collected from both USA and Sweden were computed using FFT. Theoretical observations revealed that there were significant differences for f between FFT and other methods to the order of 10-50%; however, there was no difference in moduli estimates for any mix and was independent of the test. Precisely, the FFT method produced rational f for mixtures that deviate from conventional mixture properties. Furthermore, statistical comparisons corroborated the predicted f estimates indicative of significant differences between the analysis techniques; but, the moduli were unaffected by the analysis methods. The study successfully illustrated the FFT technique, a user-friendly analytical procedure that can obviate the errors in the rational estimation of the acutely sensitive viscoelastic parameters.

Place, publisher, year, edition, pages
2013. Vol. 6, no 6, 745-754 p.
Keyword [en]
Asphalt Mix, Frequency-Sweep test, Phase Angle, Fast Fourier Transform, Moduli
National Category
Civil Engineering
URN: urn:nbn:se:kth:diva-125011DOI: 10.6135/ diva2:638776

QC 20150202

Available from: 2013-08-02 Created: 2013-08-02 Last updated: 2015-02-02Bibliographically approved

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Ahmed, Abubeker W.
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Highway and Railway Engineering
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