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Application of resonant acoustic spectroscopy to asphalt concrete beams for determination of the dynamic modulus
KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.
Lund Univ, Sweden.
KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.ORCID iD: 0000-0003-0889-6078
2012 (English)In: Materials and Structures, ISSN 1359-5997, E-ISSN 1871-6873, Vol. 45, no 12, 1903-1913 p.Article in journal (Refereed) Published
Abstract [en]

In this paper, a new application of resonant acoustic spectroscopy (RAS) is examined for constructing asphalt concrete mastercurves from seismic testing. The frequency-dependent material properties can be characterized from multiple modes of vibration through the use of RAS. Beam-shaped asphalt specimens are tested at multiple temperatures to determine the resonance frequencies of the specimens. The resonance frequencies are estimated by applying a small load impulse and measuring the resulting acceleration through the specimens. Using RAS, the material properties of the specimens are determined numerically using the measured resonance frequencies. The results presented show that the frequency-dependent dynamic modulus of the asphalt concrete specimens can be characterized using several modes of vibration at each testing temperature.

Place, publisher, year, edition, pages
Springer Netherlands , 2012. Vol. 45, no 12, 1903-1913 p.
Keyword [en]
Resonant acoustic spectroscopy, Resonance frequency, Dynamic modulus, Mastercurve
National Category
Infrastructure Engineering
Identifiers
URN: urn:nbn:se:kth:diva-104234DOI: 10.1617/s11527-012-9877-3ISI: 000311786400009OAI: oai:DiVA.org:kth-104234DiVA: diva2:563586
Note

QC 20121112

Available from: 2012-10-30 Created: 2012-10-30 Last updated: 2017-12-07Bibliographically approved
In thesis
1. Laboratory Seismic Testing of Asphalt Concrete
Open this publication in new window or tab >>Laboratory Seismic Testing of Asphalt Concrete
2012 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Nondestructive laboratory seismic testing to characterize the complex modulus and Poisson’s ratio of asphalt concrete is presented in this thesis. These material properties are directly related to pavement quality and the dynamic Young’s modulus is used in thickness design of pavements. Existing standard laboratory methods to measure the complex modulus are expensive, time consuming, not truly nondestructive and cannot be directly linked to nondestructive field measurements. This link is important to enable future quality control and quality assurance of pavements based on the dynamic modulus.Therefore, there is a need for a more detailed and accurate laboratory test method that is faster, more economic and can increase the understanding and knowledge of the behavior of asphalt concrete. Furthermore, it should be able to be linked to nondestructive field measurements for improved quality control and quality assurance of pavements. Seismic testing can be performed by using ultrasonic measurements, where the speed of sound propagating through a material with known dimensions is measured. Seismic testing can also be used to measure the resonance frequencies of an object. Due to any excitation, a solid resonates when the frequency of the applied force matches the natural frequencies of the object. In this thesis, resonance frequency measurements have been performed at several different temperatures by applying a load impulse to a specimen while measuring its dynamic response. The measured resonance frequencies and the measured frequency response functions have been used to evaluate the complex modulus and Poisson’s ratio of asphalt concrete specimens. Master curves describing the complex modulus as a function of temperature and loading frequency have been determined through these measurements.The proposed seismic method includes measurements that are significantly faster, easier to perform, less expensive and more repeatable than the conventional test methods. However, the material properties are characterized at a higher frequency range compared to the standard laboratory methods, and for lower strain levels (~10-7) compared to the strain levels caused by the traffic in the pavement materials. Importantly, the laboratory seismic test method can be linked together with nondestructive field measurements of pavements due to that the material is subjected to approximately the same loading frequency and strain level in both the field and laboratory measurements. This allows for a future nondestructive quality control and quality assurance of new and old pavement constructions.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. vii, 23 p.
Series
Trita-TSC-LIC, ISSN 1653-445X ; 12:009
National Category
Infrastructure Engineering
Identifiers
urn:nbn:se:kth:diva-104236 (URN)978-91-85539-97-0 (ISBN)
Presentation
2012-12-19, B26, Brinellvägen 23, KTH, Stockholm, 09:00 (English)
Opponent
Supervisors
Note

QC 20121120

Available from: 2012-11-20 Created: 2012-10-30 Last updated: 2012-11-20Bibliographically approved
2. 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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