The effect of cardanol-formaldehyde resin in the rheological properties of the asphalt binder

Abstract

Due to increasing traffic in federal and state roads, asphalt pavements develop problems such as permanent deformation, fatigue cracks and thermal breakdown. This work aims to use a phenolic resin obtained from a renewable product (Cashew Nut Shell Liquid- CNSL) as an additive in asphalt mixtures. The resin was synthesized from the reaction of formaldehydewithcardanol, which was extracted from Cashew Nut Shell Liquid (CNSL) by liquid-liquid extraction. After FTIR characterization, the resin was added to the asphalt binder. This mixture called CAPRES presented interesting results, like reduction of approximately 10°C in the mixing and compaction temperature (MCT), improved elastic response and an increase in stiffness compared to pure asphalt cement (AC). These results reduce significantly problems found on asphaltic pavement with regard to structural problems such as permanent deformations.