Effect of mixing sequence on the workability and performance of asphalt mixtures
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2015 Taylor & Francis. 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 scale up 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 analyze the effect of this on the workability and resulting mixture performance, X-Ray Computed Tomography was used to analyze mixtures produced by the two different mixing sequences. Mechanical testing was utilized 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 longterm performance.
