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Observed deviations from isotropic linear viscoelastic behavior of asphalt concrete through modal testing
KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.
KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.
KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.ORCID iD: 0000-0003-0889-6078
2014 (English)In: Construction and Building Materials, ISSN 0950-0618, E-ISSN 1879-0526, Vol. 66, 63-71 p.Article in journal (Refereed) Published
Abstract [en]

The complex Young's moduli, complex shear moduli and complex Poisson's ratio of a beam shaped asphalt concrete specimen have been characterized through low strain (similar to 10(-7)) frequency response function measurements. The assumption of isotropic linear viscoelastic behavior has been applied and investigated. The results indicate that the asphalt concrete specimen agree with the isotropic linear viscoelastic assumption at low temperatures and high frequencies (>10 kHz at 0 degrees C), but at higher temperatures and lower frequencies, discrepancies from isotropic linear behavior are shown. The dynamic shear moduli calculated from the estimated Young's moduli and Poisson's ratio of the asphalt concrete specimen are overestimated for frequencies and temperatures often applied to pavements.

Place, publisher, year, edition, pages
2014. Vol. 66, 63-71 p.
Keyword [en]
Asphalt concrete, Complex modulus, Complex shear modulus, Complex Poisson's ratio, Modal testing, Frequency response functions
National Category
Infrastructure Engineering
Identifiers
URN: urn:nbn:se:kth:diva-151326DOI: 10.1016/j.conbuildmat.2014.05.077ISI: 000340688200008Scopus ID: 2-s2.0-84902202910OAI: oai:DiVA.org:kth-151326DiVA: diva2:748060
Note

QC 20140918

Available from: 2014-09-18 Created: 2014-09-18 Last updated: 2017-12-05Bibliographically approved
In thesis
1. Resonance Testing of Asphalt Concrete
Open this publication in new window or tab >>Resonance Testing of Asphalt Concrete
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis present novel non-destructive laboratory test methods to characterize asphalt concrete. The testing is based on frequency response measurements of specimens where resonance frequencies play a key role to derive material properties such as the complex modulus and complex Poisson’s ratio. These material properties are directly related to pavement quality and used in thickness design of pavements.

Since conventional cyclic loading is expensive, time consuming and complicated to perform, there has been a growing interest to apply resonance and ultrasonic testing to estimate the material properties of asphalt concrete. Most of these applications have been based on analytical approximations which are limited to characterizing the complex modulus at one frequency per temperature. This is a significant limitation due to the strong frequency dependency of asphalt concrete. In this thesis, numerical methods are applied to develop a methodology based on modal testing of laboratory samples to characterize material properties over a wide frequency and temperature range (i.e. a master curve).

The resonance frequency measurements are performed by exciting the specimens using an impact hammer and through a non-contact approach using a speaker. An accelerometer is used to measure the resulting vibration of the specimen. The material properties can be derived from these measurements since resonance frequencies of a solid are a function of the stiffness, mass, dimensions and boundary conditions.

The methodology based on modal testing to characterize the material properties has been developed through the work presented in paper I and II, compared to conventional cyclic loading in paper III and IV and used to observe deviations from isotropic linear viscoelastic behavior in paper V. In paper VI, detailed measurements of resonance frequencies have been performed to study the possibility to detect damage and potential healing of asphalt concrete. 

The resonance testing are performed at low strain levels (~10^-7) which gives a direct link to surface wave testing of pavements in the field. This enables non-destructive quality control of pavements, since the field measurements are performed at approximately the same frequency range and strain level.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. xiii, 51 p.
Series
TRITA-TSC-PHD, 14:008
Keyword
Resonance frequencies; Modal testing; Frequency response functions; Cyclic loading; Tension-compression tests; Complex modulus; Complex Poisson’s ratio
National Category
Infrastructure Engineering
Identifiers
urn:nbn:se:kth:diva-155906 (URN)978-91-87353-50-5 (ISBN)
Public defence
2014-12-08, Kollegiesalen, Brinellvägen 8, KTH, Stockholm, 09:00 (English)
Opponent
Supervisors
Note

QC 20141117

Available from: 2014-11-17 Created: 2014-11-14 Last updated: 2015-06-02Bibliographically approved

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Birgisson, Björn

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