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Complex modulus and complex Poisson's ratio from cyclic and dynamic modal testing of asphalt concrete
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.
2015 (English)In: Construction and Building Materials, ISSN 0950-0618, Vol. 88, 20-31 p.Article in journal (Refereed) Published
Abstract [en]

The complex moduli and complex Poisson's ratio of two cylindrical asphalt concrete specimens have been determined through modal testing in this paper. These results have been compared to cyclic tension-compression measured complex moduli and complex Poisson's ratio of asphalt concrete specimens with different dimensions. The modal testing has been performed by measuring frequency response functions of the specimens using an impact hammer and an accelerometer. The material properties have been characterized by matching finite element computed frequency response functions to the measurements. The results of the different specimens show that the modal test systematically give a slightly higher absolute value of the complex moduli compared to the cyclic testing. The differences are most likely a result of the different strain levels applied in the two test methods. However, the modal and cyclic tension-compression testing resulted in similar values of the complex Poisson's ratio for the two different asphalt concrete mixtures despite the different applied strain levels.

Place, publisher, year, edition, pages
2015. Vol. 88, 20-31 p.
Keyword [en]
Asphalt concrete, Complex, Complex modulus, Cyclic testing, Frequency response functions, Modal testing, Poisson's ratio, Asphalt, Asphalt mixtures, Compression testing, Concrete mixtures, Concrete testing, Concretes, Frequency response, Modal analysis, Poisson ratio, Modal testings
National Category
Construction Management
URN: urn:nbn:se:kth:diva-167690DOI: 10.1016/j.conbuildmat.2015.04.007ISI: 000357909700003ScopusID: 2-s2.0-84927929073OAI: diva2:816072

QC 20150602

Available from: 2015-06-02 Created: 2015-05-22 Last updated: 2015-08-14Bibliographically 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.
Resonance frequencies; Modal testing; Frequency response functions; Cyclic loading; Tension-compression tests; Complex modulus; Complex Poisson’s ratio
National Category
Infrastructure Engineering
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)

QC 20141117

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

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Gudmarsson, AndersRydén, Nils
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