Effect of mixing sequence on the workability and performance of asphalt mixtures
2015 (English)In: International Journal on Road Materials and Pavement Design, ISSN 1468-0629, E-ISSN 2164-7402, 197-213 p.Article in journal (Refereed) Published
In Sweden, during recent years, a new type of mixing protocol has been applied, in which the order of mixing is changed from the conventional method. Improved workability and diminished mixing and compaction energy needs have been important drivers for this. Considering that it is the mastic phase, which is modified by changing the mixing order, it provides an interesting case study for explaining the mechanisms of workability in connection with the mastic phase. To do so, an analytical viscosity framework was combined with a mixture morphology framework to upscale to the mixing level and tribology principles to explain the interaction between the mastic and the aggregates. From the mastic viscosity protocol, it was found that the mixing order significantly affects the resulting mastic viscosity. To analyse the effect of this on the workability and resulting mixture performance, X-ray computed tomography was used to analyse mixtures produced by the two different mixing sequences. Mechanical testing was utilised to determine the long-term mechanical performance. In this part of the study, mastic viscosity as a function of particle concentration and distribution was directly coupled to improved mixture workability and enhanced long-term performance.
Place, publisher, year, edition, pages
Taylor & Francis Group, 2015. 197-213 p.
asphalt mastics, asphalt mixtures, mastic viscosity, mixing method, sequential mixing, workability, Asphalt, Computerized tomography, Mastic asphalt, Mechanical testing, Mixing, Mixtures, Viscosity, Asphalt mastic, Conventional methods, Long term performance, Mechanical performance, Particle concentrations, X-ray computed tomography
IdentifiersURN: urn:nbn:se:kth:diva-176169DOI: 10.1080/14680629.2015.1077008ISI: 000374397900009ScopusID: 2-s2.0-84941249199OAI: oai:DiVA.org:kth-176169DiVA: diva2:874686
QC 201511272015-11-272015-11-022016-06-10Bibliographically approved