Experimental and theoretical characterization of the engineering behavior of bitumen mixed with mineral filler |
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Authors: | Jian-Shiuh Chen Po-Hong Kuo Ping-Sien Lin Chien-Chung Huang Kui-Yi Lin |
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Affiliation: | (1) Department of Civil Engineering, Sustainable Environment Research Center, National Cheng Kung University, Tainan, 701, Taiwan;(2) Department of Civil Engineering, National Chung Hsing University, Taichung, 401, Taiwan |
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Abstract: | The dynamic shear rheometer (DSR) and the bending beam rheometer (BBR) were used to characterize the rheological properties
of bitumen mixed with mineral filler that is smaller than 75 μm in size. The study focuses on using a rheology-based model
to assess the effect of two distinctly different fillers, quartz and calcite, on the engineering behavior of the bitumen-mineral
filler mastic. Four conventionally different bitumens were selected to assess the filler effect. By mathematically modeling
the rheological response, predicting the rheological behavior of mastics becomes simpler and more efficient in approach. The
rheological properties of bitumen-mineral filler mastics are characterized using the time–temperature superposition principle
after data obtained from DSR and BBR are converted to the same unit. The stiffening effects of the filler are relatively small
at short loading times or low temperatures, but are larger at higher temperatures or long loading times. This stiffening effect
is found to be bitumen dependent as well as filler dependent. The validity of a micromechanical model is confirmed in this
study. The Nielsen model was selected since it employs rheological parameters that could explain the filler effect. The micromechanical
model shows good agreement with testing data at the filler volume fraction up to 22%. |
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Keywords: | Bitumen Mastic Rheological property Micromechanical model |
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