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On the Measurement of two Independent Viscoelastic Functions with Instrumented Indentation Tests
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering.
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering.
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.), Solid Mechanics (Div.).ORCID iD: 0000-0001-6232-8819
2018 (English)In: Experimental mechanics, ISSN 0014-4851, E-ISSN 1741-2765, Vol. 58, no 2, p. 301-314Article in journal (Refereed) Published
Abstract [en]

In the present paper, a methodology for complete characterization of linear isotropic viscoelastic material with spherical instrumented indentation test is proposed. The developed method allows for measuring two independent viscoelastic functions, shear relaxation modulus and time-dependent Poisson's ratio, from the indentation test data obtained at non-decreasing loading, but otherwise arbitrary. Finite element modelling (FEM) is relied upon for validating the proposed methodology and for quantifying the influence of experimental variables on the measurements accuracy. Spherical indentation experiments are performed on several viscoelastic materials: polyoxymethylene, bitumen and bitumen-filler mastics. The viscoelastic material functions obtained with the indentation tests are compared with the corresponding results from the standard mechanical tests. Numerical and experimental results presented indicate that the methodology proposed allows mitigating the machine compliance and loading rate effects on the accuracy of the viscoelastic indentation tests.

Place, publisher, year, edition, pages
Springer, 2018. Vol. 58, no 2, p. 301-314
Keywords [en]
Indentation, Viscoelasticity, Mechanics of materials, FEM, Bitumen, Bitumen-filler mastics
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-222406DOI: 10.1007/s11340-017-0342-7ISI: 000423584800008Scopus ID: 2-s2.0-85030833837OAI: oai:DiVA.org:kth-222406DiVA, id: diva2:1186311
Note

QC 20180228

Available from: 2018-02-28 Created: 2018-02-28 Last updated: 2020-04-28Bibliographically approved
In thesis
1. New Experimental and Modelling Tools for Multiscale Characterization of Asphalt Mastic
Open this publication in new window or tab >>New Experimental and Modelling Tools for Multiscale Characterization of Asphalt Mastic
2020 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Asphalt mastics act as a binding phase in asphalt mixtures and their rheological properties strongly affect the performance of asphalt mixtures with respect to virtually all damage modes. In order to measure mastics properties, relevant for field performance, testing should be performed at size-scales representative for the morphology and material inhomogeneity of asphalt mixtures. This thesis aims to contribute to solving these important issues by developing new experimental and modelling tools for the multi-scale characterization of asphalt mastics.

An instrumented indentation test for viscoelastic characterization of asphalt mastics is proposed as a new alternative to existing techniques. A methodology for spherical indentation testing of bituminous materials is developed allowing measuring their viscoelastic properties at arbitrary non-decreasing loading. The potential of indentation tests for multi-scale measurements of viscoelastic properties of binder-aggregate composites is investigated for the special case of asphalt mortar, composed of mastic and aggregates smaller than 2.36 mm. The effect of the test parameters on the measured apparent shear relaxation modulus of asphalt mortar is evaluated. Experimental and modelling results indicate that the measurement scale in the indentation tests can be controlled efficiently by testing with different indenter-specimen contact areas. Accordingly, indentation tests may be used for reliable viscoelastic characterization of binder-aggregate composites on macro-scale as well as on the mastic phase level. It may thus potentially provide a relatively simple tool for measuring viscoelastic properties of mastics in situ in asphalt mixtures. 

In order to establish a quantitative link between material design parameters of mastics and its rheology, a new finite element (FE) micromechanical modelling approach has been developed. It allows predicting the viscoelastic properties of bitumen-filler mastic from its volumetric, mechanical and geometrical design parameters. The influence of modelling parameters on the model’s accuracy is evaluated and optimal parameter combinations are identified. The model is validated with the measurements performed on several mastics and for a range of volumetric concentration of filler. It is shown that the proposed model can capture the measured viscoelastic behaviour of mastics for the examined range of loading, temperature and material parameters. Accordingly, it may be a useful tool for optimizing mastics material design for the target viscoelastic properties.

Abstract [sv]

Asfaltmastix fungerar som bindemedel i asfaltsblandningar och blandningens uppträdande vad gäller i stort sett alla skadetyper är starkt beroende av asfaltmastixens reologiska egenskaper. Att förstå de mekanismer och parametrar som beskriver asfaltmastixens reologi är därför nödvändigt för att försäkra sig om ett tillräckligt bra beteende hos asfaltsblandningar. Dessutom, för att kunna mäta mastix egenskaper, relevanta för materialets uppträdande i fält, bör provning genomföras för längdskalor som är relevanta för blandningens morfologi. Inhomogeniteter hos materialet måste också beaktas. Denna avhandling strävar mot att lösa dessa viktiga problem genom att utveckla experimentella verktyg och modelleringsverktyg för flerskalekarakterisering av mastix.Instrumenterad intryckningsmetodik, för viskoelastisk karakterisering av mastix, beskrivs i avhandlingen som ett alternativ till andra provningsmetoder. En ny metod, som utgår ifrån sfärisk intryckningsprovning av asfaltmastix, har tagits fram med avsikten att mäta viskoelastiska storheter vid godtycklig men ökande last. I avhandlingen undersöks nyttan med att använda intryckningsprov för flerskalekarakterisering av bindemedel/partikel kompositer, speciellt för fallet asfaltsbruk. Provparametrarnas inverkan på den uppmätta relaxationsmodulen utvärderas. De framtagna resultaten visar att mätskalan vid intryckningsproven kan kontrolleras effektivt genom att styra kontaktytans storlek vid experimenten. Sammantaget visas i avhandlingen att intryckningsprov är ett trovärdigt alternativ för viskoelastisk karakterisering av de aktuella kompositmaterialen, på både makronivå och komponentnivå. Metoden har alltså potential att vara ett relativt enkelt alternativ för att på plats mäta materialegenskaper hos asfaltsmaterial/asfaltsblandningar.För att fastställa en kvantitativ länk mellan materialets modellparametrar och dess reologi så har ett nytt mikromekaniskt angreppssätt, baserat på finit elementmetodik, utvecklats. Avsikten är då att beräkna de viskoelastiska egenskaperna hos asfaltmastix utgående från de av problemet givna parametrarna. Modellparametrarnas inverkan på noggrannheten utvärderas och optimala parameterkombinationer identifieras. Modellen valideras med hjälp av experiment på olika asfaltsmaterial och den visar sig kunna fånga det uppmätta viskoelastiska beteendet för det aktuella intervallet av olika undersökta parametrar. Följaktligen kan det vara ett användbart verktyg för att optimera framtagningen av asfaltsmaterial utgående från de riktmärken för det viskoelastiska beteendet som sätts upp.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2020. p. 31
Series
TRITA-ABE-DLT ; 2012
National Category
Civil Engineering Applied Mechanics
Research subject
Civil and Architectural Engineering, Building Materials
Identifiers
urn:nbn:se:kth:diva-272739 (URN)978-91-7873-513-6 (ISBN)
Presentation
2020-05-28, Via Zoom - https://kth-se.zoom.us/j/68519700863, Du som saknar dator/datorvana kan kontakta jelagin@kth.se för information / Use the e-mail address if you need technical assistance, Stockholm, 10:00 (English)
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Supervisors
Note

QC 20200506

Available from: 2020-05-06 Created: 2020-04-28 Last updated: 2020-05-06Bibliographically approved

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