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
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. Vol. 132, no 4, 2304-2312 p.
Asphalt concrete, Dynamic response, Optimization, Three dimensional
IdentifiersURN: urn:nbn:se:kth:diva-104235DOI: 10.1121/1.4747016ISI: 000309650600036ScopusID: 2-s2.0-84867340539OAI: oai:DiVA.org:kth-104235DiVA: diva2:563591
QC 201211122012-10-302012-10-302014-11-17Bibliographically approved