Journal of Materials Research and Technology (May 2024)
Evaluation of particle morphology and size of mineral filler and their effects on mastic rheological and creep behavior: Experimental and numerical characterizations
Abstract
The primary objective was to evaluate the effects of particle morphology and size of mineral fillers on mastic rheological and creep properties. Experimentally, eight fillers prepared using the same grinding procedure were characterized. Dynamic shear rheometer and bending beam rheometer tests were employed to evaluate mastic rheological and creep behavior, respectively. Numerically, a dynamic viscoelastic model and Burgers creep damage model based on fractional derivatives were established. Results demonstrate that the datasets agree well using fewer model parameters, which can illustrate the availability of the proposed numerical method for the response of all analyzed mastic specimens. As the particle size decreases, material parameter and fractional order are increased by 10.31%, 23.45%, 24.72% and 0.68%, 1.46%, 1.48% for mastics containing limestone filler; and that are increased by 7.07%, 15.38%, 38.06% and 0.76%, 0.85%, 1.18% for mastics with granite filler at 45 °C, respectively. Apart from 150 to 200 mesh size range, the mastic with granite filler is less prone to creep damage accumulation inside the specimen than that containing limestone filler during the loading process. As the particle size increases, relaxation time is rapidly increased by 5.41%, 26.35%, 27.99% and 5.55%, 20.98%, −1.33% for limestone filler-asphalt mastics and granite filler-asphalt mastics, respectively. Moreover, form factor is the determining influential factor for mastic anti-rutting performance, temperature susceptibility and creep damage, while fractal dimension is the most relational factor affecting mastic dissipation capacity, regardless of filler lithology. All the results are conducive to designing mineral filler that fabricates mastic with the desired property.
