Abstract
ABSTRACT This study is to characterise rheological properties of sulfur-extended asphalts with/without crumb rubber at high, intermediate, and low temperatures using standard asphalt binder tests. Four dosages of sulfur (i.e. 0%, 15%, 30% and 45%) by weight of neat asphalt binder were used. The results indicated that a low level of sulfur addition, such as 15%, softened original asphalt binder. When the sulfur dosage was larger than 15%, the extra sulfur would act as fillers to stiffen asphalt binder. The addition of crumb rubber significantly increased high temperature performance grade. For sulfur-extended asphalts with/without crumb rubber, an increase in the sulfur dosage resulted in an increase of low temperature performance grade. Sulfur-extended asphalt with 15% sulfur exhibited the largest non-recovery creep compliance (Jnr) value, while the 30% and 45% exhibited the lowest values since more extra sulfur acts as fillers to stiffen asphalt binder. The addition of sulfur significantly decreased viscosity. The semi-circular bending fracture test results indicated that the mixture with the addition of 15% sulfur was softer and behaved in a more ductile manner than the others, which is consistent with the asphalt binder test results of high temperature performance grade and non-recovery creep compliance.
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