Abstract
Rheological behavior of styrene-butadiene-styrene (SBS) modified bitumen with the presence of micro glass bead (GB) is investigated. It is found that either the GB fraction or size can influence the rheological property of bitumen/SBS/GB blends. Phase separation structures in all the modified bitumen systems keep a droplet-matrix type due to the sizeable compositional asymmetry between SBS-rich phase and bitumen-rich phase. The difference in the interfacial area fraction, obtained by Image J analysis reflects the effect of GB size on the rheological property. Further study on the rheology-structure correlation is put special attention on bee structure (catana phase) measured by AFM. It is found that the ratio of specific amplitude to the wavelength (Α0/λ0) of a bee-like structure may be a valid indicator of stiffness for the modified bitumen concerning the effect of GB size difference on the rheological property. When the chemical composition is the same, the lower value of Α0/λ0 indicates the modified bitumen with higher stiffness.
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