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Numerical and experimental evaluation of the influence of the filler-bitumen interface in mastics
KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.
KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.ORCID iD: 0000-0003-0889-6078
KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.ORCID iD: 0000-0003-3968-6778
2014 (English)In: Materials and Structures, ISSN 1359-5997, E-ISSN 1871-6873, Vol. 47, no 8, 1325-1337 p.Article in journal (Refereed) Published
Abstract [en]

The successful use of additives in modified asphalt mixtures, such as warm mix asphalt, depends largely on the effect such modification has on the mastic. Previous research indicated that such modifiers do not simply change the bitumen properties, but can also change the interaction between the filler and the bitumen matrix. Understanding the effect of the properties of the fillers, the bitumen and their interaction is thus important for future asphalt mix design. In order to investigate this and to define the dominant relationships, this paper combines a numerical and experimental approach. In the experiments, the viscosities of modified and unmodified mastics with different filler concentrations and types were systematically investigated utilizing a novel testing protocol. In the numerical analyses, the Finite Element Method was utilized for a micro-mechanical analysis, in which the shape and size of the filler particles were varied in the bitumen matrix. Combining the experimental and numerical results allowed for a detailed investigation of the effect of the interface properties, with and without modifiers. The research further indicated that the effect of the shape and size of the fillers varied, depending on the interface properties. From the research relationships were established between the overall mastic viscosity and the influence of the filler-bitumen interface, considering shape and size. The conclusion of this paper can thus be useful for the effective development of modified asphalt mixtures and gives strong indications towards future research directions.

Place, publisher, year, edition, pages
2014. Vol. 47, no 8, 1325-1337 p.
Keyword [en]
Mastic, Filler-bitumen interaction, Viscosity, Interface properties, Asphalt modification
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-149190DOI: 10.1617/s11527-013-0237-8ISI: 000339377200006Scopus ID: 2-s2.0-84904406671OAI: oai:DiVA.org:kth-149190DiVA: diva2:738605
Note

QC 20140818

Available from: 2014-08-18 Created: 2014-08-18 Last updated: 2017-12-05Bibliographically approved
In thesis
1. Characterisation and Modelling of Asphalt Mastic and Their Effect on Workability
Open this publication in new window or tab >>Characterisation and Modelling of Asphalt Mastic and Their Effect on Workability
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. v, 64 p.
Series
TRITA-TSC-PHD, 14:005
Keyword
Asphalt, Pavement, Mastics, Bitumen, Viscosity, Rheology, Filler, Filler-Bitumen Interaction, Workability, X-Ray CT.
National Category
Engineering and Technology
Research subject
Civil and Architectural Engineering
Identifiers
urn:nbn:se:kth:diva-150233 (URN)978-91-87353-46-8 (ISBN)
Public defence
2014-09-12, Kollegiesalen (the old chapel), brinellvägen 8, KTH, Stockholm, 09:00 (English)
Opponent
Supervisors
Note

QC 20140902

Available from: 2014-09-02 Created: 2014-09-01 Last updated: 2015-04-13Bibliographically approved

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Birgisson, BjörnKringos, Niki

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