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Non-Contact Excitation of Fundamental Resonance Frequencies of an Asphalt Concrete Specimen
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
2015 (English)In: AIP Conference Proceedings, 2015, Vol. 1650, 1401-1408 p.Conference paper, Published paper (Refereed)
Abstract [en]

Impact hammer and non-contact speaker excitation were applied to an asphalt concrete, a PVC-U and a concrete specimen to measure the fundamental longitudinal resonance frequency at different strain levels. The impact and the non-contact excitation methods resulted in similar resonance frequencies for the undamaged asphalt concrete and for the PVC-U specimen. However, the two excitation approaches gave different results for the concrete specimen, which was shown to have a nonlinear response to increasing strain levels. A reduction and a following recovery of the resonance frequency of the asphalt concrete were shown after the specimen was exposed to a small amount of damage. However, no fast nonlinear dynamics were observed for the asphalt concrete through the speaker measurements.

Place, publisher, year, edition, pages
2015. Vol. 1650, 1401-1408 p.
Series
AIP Conference Proceedings, ISSN 0094-243X ; 1650
National Category
Infrastructure Engineering
Identifiers
URN: urn:nbn:se:kth:diva-155905ISI: 000354938100166ISBN: 978-0-7354-1292-7 (print)OAI: oai:DiVA.org:kth-155905DiVA: diva2:763290
Conference
41th Annual Review of Progress in Quantitative Nondestructive Evaluation, Boise, USA
Note

QC 20141117

Available from: 2014-11-14 Created: 2014-11-14 Last updated: 2015-08-18Bibliographically 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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