Application of nanomaterials on the performance of SBS modified asphalt binders and mixtures: A comprehensive review

Presently, many asphalts and modified asphalts fail to satisfy long-term serviceability and durability criteria. Researchers are utilizing several asphalt modifiers to enhance the overall performance of flexible pavements. This study consolidated findings from multiple research efforts on using nanomaterials for modifying SBS modified asphalt (SBS MA) and conducted a comprehensive literature review. Initially, it discussed the importance of SBS MA within asphalt modification systems and identified the key nanomaterials utilized in SBS modified asphalt. After this, it reviewed their preparation methods, dispersion and characterization techniques, and their impact on the key performance parameters of SBS MA binder and its mixture such as viscosity, rutting resistance, fatigue resistance, ageing and moisture damage etc. Additionally, it highlighted the advantages of nanomaterials over other modifiers. This study also addressed the challenges and limitations of incorporating nanomaterials in SBS MA. The findings indicated that when properly integrated, nanomaterials could significantly improve the performance of SBS MA, making them a promising addition to future road construction and maintenance projects. However, using nanomaterials for SBS MA modifications and mixtures has been challenged by limited practical applications, insufficient life cycle cost analyses, a lack of standardized guidelines, cost-effective nanomaterials and insufficient mixing procedures. Those areas require additional research to realise the potential application of nanomaterials in SBS modified asphalt modifications full.