The effect of filler type and shape on HMA energy dissipation performance.
Hot mix asphalt pavements require adequate compaction to achieve
the required density to resist rutting. The amount of energy required to achieve the
optimum degree of compaction depends on the type of gradation, bitumen content,
filler type and shape, type of compaction equipment etc. In this study, the net energy
required to reduce the specimen volume (size) after each gyration of the superpave
gyratory compactor is used as the compaction energy index (CEI) to measure the
compactability of the samples. Samples with different filler types and content are used
for the analysis.
Effect of fillers on the viscosity of the mastic has been studied previously. Viscosity
of mastics in return affects the compactability of the mix in general. In this regard this
paper tries to study the effect of fillers on the compaction of hot mix asphalt with the
help of the superpave gyratory compactor. Moreover, resistance of the asphalt mix
samples against rutting is evaluated using the simple performance test. In this test, the
sample is subjected to a hydraulic loading while strain transducers attached to the
sample measure the displacement. A computer program receives the displacement
data at various frequencies and calculates the dynamic modulus and flow number
which are used for the evaluation of the pavement performance.
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