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Automated Non-contact Resonance Excitation Method for Low Temperature Behavior of Asphalt Concrete
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Materials.ORCID iD: 0000-0002-4845-2458
(English)Manuscript (preprint) (Other academic)
Abstract [en]

This paper studies the applicability of an automated non-destructivetesting method to monitor the stiffness of asphalt concrete at lowtemperatures. A loudspeaker is used as a source of non-contact excitation ofthe axially symmetric fundamental resonance frequencies of a disc-shapedasphalt concrete specimen positioned inside an environmental chamber. Measuredresonance frequencies are used to calculate the dynamic moduli of the specimenat different temperatures. The repeatability of the method as well as theeffect of loudspeaker height above the sample are studied. Results show thatthe main advantage of the non-contact excitation method, compared to manuallyapplied impact hammer excitation, is that repeatable automated measurements canbe performed while the specimen is placed inside an environmental temperaturechamber. This methodology enables to study the effect of only low temperatureconditioning on the dynamic modulus of asphalt concrete without interferencefrom mechanical loading.

Keywords [en]
Resonance frequency, non-contact Resonance, dynamic modulus, asphalt concrete
National Category
Infrastructure Engineering
Research subject
Civil and Architectural Engineering
Identifiers
URN: urn:nbn:se:kth:diva-239949OAI: oai:DiVA.org:kth-239949DiVA, id: diva2:1269039
Funder
Swedish Transport Administration, T7752
Note

QC 20181210

Available from: 2018-12-07 Created: 2018-12-07 Last updated: 2018-12-10Bibliographically approved
In thesis
1. Application of Automated Non-contact Resonance Testing for Low Temperature Behavior of Asphalt Concrete
Open this publication in new window or tab >>Application of Automated Non-contact Resonance Testing for Low Temperature Behavior of Asphalt Concrete
2019 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Impact resonance testing is a well-documented non-destructive testing method and its applications on asphalt concrete have also been implemented successfully. The test is carried out manually by inducing an impact in order to excite the test specimen and taking measurements of the vibrational response. In an effort to improve the manual procedure of impact resonance testing, an automated non-contact methodology is developed and its applicability with regards to low temperature behaviors of asphalt concrete is investigated. Results from this work show that repeatable fundamental resonance frequency measurements can be performed on a disc shaped specimen in an automated manner without the need to open the thermal chamber. The measurements obtained from the new method have been verified by taking similar resonance frequency measurements using an instrumented impact hammer. It has also been shown in this work that the proposed method is suitable to investigate the lone effects of cyclic thermal conditioning on asphalt concrete without any other possible biasing effects associated with contact in the conventional testing. A hysteretic behavior of stiffness modulus is obtained on three different asphalt concrete specimens subjected to repeated low temperature cyclic conditioning. Reduced modulus values at each temperature are obtained in all the tested specimens after a low temperature stepwise conditioning at temperatures from 0oC to -40 oC. This observed behavior shows that the dynamic modulus of the tested specimens is affected by low temperature conditioning. The norm of the complex modulus decreases and the phase angle or damping ratio increases after low temperature conditioning. Hence, valuable and practical low temperature characteristics of different asphalt concrete mixtures can possibly be obtained by using the proposed methodology.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2019. p. 23
Series
TRITA-ABE-DLT ; 1844
Keywords
Resonance testing, stiffness modulus, asphalt concrete, Non-contact excitation, Resonance frequency
National Category
Infrastructure Engineering
Research subject
Civil and Architectural Engineering
Identifiers
urn:nbn:se:kth:diva-239946 (URN)978-91-7873-058-2 (ISBN)
Presentation
2019-01-22, U61, Brinellvägen 28A, Stockholm, 10:00 (English)
Opponent
Supervisors
Funder
Swedish Transport Administration, T7752
Available from: 2018-12-10 Created: 2018-12-07 Last updated: 2018-12-10Bibliographically approved

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