Abstract
The non-renewable characteristics and growing demand for crude oil is prompting the development of alternative materials such as bio-asphalt for pavement engineering. In this study, the chemical compositions of bio-asphalt extracted from castor marked as SHB were evaluated by elemental analysis, infrared spectroscopy and molecular weight distribution analysis. Results revealed that the chemical compositions of SHB bio-asphalt were similar to those of petroleum asphalt, yet the former cannot be directly utilized in pavement construction. Therefore, crumb rubber (CR) and styrene–butadiene–styrene block copolymer (SBS) additives were incorporated into petroleum asphalt blended with bio-asphalt to prepare composite modified asphalt. The ultimate high- and low-temperature performances of the proposed composite modified asphalt indicated that the percentages of raw additive materials were 15% for SHB, 18% for CR and 2% for SBS. Rheological properties were further evaluated using master curves and Han curves, which have been found that SHB addition benefited the high- and low-temperature performances of the CR/SBS composite modified asphalt.
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