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Characterisation and Modelling of Asphalt Mastic and Their Effect on Workability
KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.
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 [en]
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: urn:nbn:se:kth:diva-150233ISBN: 978-91-87353-46-8 (print)OAI: oai:DiVA.org:kth-150233DiVA: diva2:742290
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
List of papers
1. An empirical framework for determining asphalt mastic viscosity as a function of mineral filler concentration
Open this publication in new window or tab >>An empirical framework for determining asphalt mastic viscosity as a function of mineral filler concentration
2012 (English)In: Construction and Building Materials, ISSN 0950-0618, E-ISSN 1879-0526, Vol. 35, 23-29 p.Article in journal (Refereed) Published
Abstract [en]

Sufficient coating, easy paving and good compaction are desirable parameters, which are approachable with the optimum viscosity of the mastic. In many studies, models have been developed for calculating the viscosity for different types of suspensions at various particle-to-fluid ratios. Unfortunately, none of them are applicable to asphalt mastics, since this material has a much wider range of mineral filler concentration from dilute to very concentrate. To give an overview of the existing viscosity models and to evaluate their range of applicability to asphalt mastics, an extensive literature review was performed. A new empirical framework was developed that removes some of the stipulated limitations of the existing theories.

Keyword
Asphalt mastic, Asphalt mixture, Filler concentration, Suspension, Viscosity
National Category
Infrastructure Engineering
Identifiers
urn:nbn:se:kth:diva-84101 (URN)10.1016/j.conbuildmat.2012.02.093 (DOI)000309493700004 ()2-s2.0-84865532590 (Scopus ID)
Note

QC 20121015. Updated from accepted to published.

Available from: 2012-02-13 Created: 2012-02-13 Last updated: 2017-12-07Bibliographically approved
2. A new protocol for measuring bituminous mastic viscosity as a function of its filler concentration
Open this publication in new window or tab >>A new protocol for measuring bituminous mastic viscosity as a function of its filler concentration
2014 (English)In: International Journal on Road Materials and Pavement Design, ISSN 1468-0629, E-ISSN 2164-7402, Vol. 15, no 2, 420-433 p.Article in journal (Refereed) Published
Abstract [en]

In this contribution the development and results of a new test protocol for measuring the viscosity of bituminous mastics are presented. The paper describes the various considerations that need to be taken into account when dealing with mastics, gives a detailed description of the sample preparation, the test set-up and the actual test performance. A demonstration of the use of the test procedure is given by developing three types of mastics in which different filler types, but a similar bitumen base, were used. From the results it can be seen that the developed protocol is sensitive enough to allow for detailed studies of the effect of filler shape, chemistry and size distribution. In continuation of this work, more types of mastics will be investigated and the test results will be linked to additional chemical and mechanical test results to further enhance the fundamental understanding of mastics.

Keyword
viscosity, Rheology, fillers, asphalt mastics
National Category
Civil Engineering
Identifiers
urn:nbn:se:kth:diva-145268 (URN)10.1080/14680629.2013.876926 (DOI)000334333300012 ()2-s2.0-84899461896 (Scopus ID)
Note

QC 20140515

Available from: 2014-05-15 Created: 2014-05-15 Last updated: 2017-12-05Bibliographically approved
3. Evaluation of Environmental Susceptibility of Bituminous Mastic Viscosity as a Function of Mineral and Biomass Fillers:
Open this publication in new window or tab >>Evaluation of Environmental Susceptibility of Bituminous Mastic Viscosity as a Function of Mineral and Biomass Fillers:
2013 (English)In: Transportation Research Record, ISSN 0361-1981, E-ISSN 2169-4052, no 2371, 23-31 p.Article in journal (Refereed) Published
Abstract [en]

Bituminous mastics influence many other important asphalt mixture properties in addition to their own allowance for the load transfer in the aggregate skeleton. The influence of bituminous mastics extents to the overall stability of a mixture, air void distribution, bitumen draindown during transport, a mixture's workability during the laying process, and the overall in-time performance of the pavement. To understand the properties of asphalt mixtures and their resistance to environmentally induced failure mechanisms, it is paramount to study not only bitumen and the asphalt mixture but also the mastic itself. Current asphalt design procedures do not take mastic behavior into account, however; this omission leads to a significant flaw in the ability to design and predict asphalt concrete response. This paper presents the results of an ongoing research project to enhance the understanding of the mastic phase as well as to develop a new test protocol to characterize mastics. A description is given of the measurements of mastic viscosity for different types of mastics in which the bitumen source is kept as a constant but with varying fillers as well as concentrations. Environmental susceptibility was investigated by subjecting the samples to aging and moisture conditioning. Biomass fillers were included in some of the mastics, in addition to some of the traditional fillers, to show their impact on the viscosity under varying conditions. Results showed that the developed test protocol was able to identify clearly the impact of filler properties on the mastic viscosity. A critical filler concentration was identified beyond which the viscosity behavior became nonlinear. The results also showed that moisture and aging had significant effects on the viscosity of mastics.

Keyword
Aggregate skeletons, Critical filler concentration, Failure mechanism, Filler properties, Mixture properties, Moisture conditioning, Overall stabilities, Viscosity behavior
National Category
Other Civil Engineering
Identifiers
urn:nbn:se:kth:diva-107716 (URN)10.3141/2371-03 (DOI)000329411200004 ()2-s2.0-84890103165 (Scopus ID)
Note

QC 20140130. Updated from accepted to published.

Available from: 2012-12-17 Created: 2012-12-17 Last updated: 2017-12-06Bibliographically approved
4. Numerical and experimental evaluation of the influence of the filler-bitumen interface in mastics
Open this publication in new window or tab >>Numerical and experimental evaluation of the influence of the filler-bitumen interface in mastics
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.

Keyword
Mastic, Filler-bitumen interaction, Viscosity, Interface properties, Asphalt modification
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-149190 (URN)10.1617/s11527-013-0237-8 (DOI)000339377200006 ()2-s2.0-84904406671 (Scopus ID)
Note

QC 20140818

Available from: 2014-08-18 Created: 2014-08-18 Last updated: 2017-12-05Bibliographically approved
5. Effect of mixing sequence on the workability and performance of asphalt mixtures
Open this publication in new window or tab >>Effect of mixing sequence on the workability and performance of asphalt mixtures
(English)In: International Journal on Road Materials and Pavement Design, ISSN 1468-0629, E-ISSN 2164-7402Article in journal (Other academic) Submitted
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-150232 (URN)
Note

QS 2014

Available from: 2014-09-01 Created: 2014-09-01 Last updated: 2017-12-05Bibliographically approved

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Citation style
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Output format
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