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Laboratory Seismic Testing of Asphalt Concrete
KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.
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: urn:nbn:se:kth:diva-104236ISBN: 978-91-85539-97-0 (print)OAI: oai:DiVA.org:kth-104236DiVA: diva2:563604
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
List of papers
1. Application of resonant acoustic spectroscopy to asphalt concrete beams for determination of the dynamic modulus
Open this publication in new window or tab >>Application of resonant acoustic spectroscopy to asphalt concrete beams for determination of the dynamic modulus
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
Keyword
Resonant acoustic spectroscopy, Resonance frequency, Dynamic modulus, Mastercurve
National Category
Infrastructure Engineering
Identifiers
urn:nbn:se:kth:diva-104234 (URN)10.1617/s11527-012-9877-3 (DOI)000311786400009 ()
Note

QC 20121112

Available from: 2012-10-30 Created: 2012-10-30 Last updated: 2017-12-07Bibliographically approved
2. Characterizing the low strain complex modulus of asphalt concrete specimens through optimization of frequency response functions
Open this publication in new window or tab >>Characterizing the low strain complex modulus of asphalt concrete specimens through optimization of frequency response functions
2012 (English)In: Journal of the Acoustical Society of America, ISSN 0001-4966, E-ISSN 1520-8524, Vol. 132, no 4, 2304-2312 p.Article in journal (Refereed) Published
Abstract [en]

Measured and finite element simulated frequency response functions are used to characterize the low strain (similar to 10(-7)) complex moduli of an asphalt concrete specimen. The frequency response functions of the specimen are measured at different temperatures by using an instrumented hammer to apply a load and an accelerometer to measure the dynamic response. Theoretical frequency response functions are determined by modeling the specimen as a three-dimensional (3D) linear isotropic viscoelastic material in a finite element program. The complex moduli are characterized by optimizing the theoretical frequency response functions against the measured ones. The method is shown to provide a good fit between the frequency response functions, giving an estimation of the complex modulus between minimum 500 Hz and maximum 18 vertical bar 000 Hz depending on the temperature. Furthermore, the optimization method is shown to give a good estimation of the complex modulus master curve.

Place, publisher, year, edition, pages
Acoustical Society of America (ASA), 2012
Keyword
Asphalt concrete, Dynamic response, Optimization, Three dimensional
National Category
Infrastructure Engineering
Identifiers
urn:nbn:se:kth:diva-104235 (URN)10.1121/1.4747016 (DOI)000309650600036 ()2-s2.0-84867340539 (Scopus ID)
Note

QC 20121112

Available from: 2012-10-30 Created: 2012-10-30 Last updated: 2017-12-07Bibliographically approved

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