Effect of surfactant modified nano-composite flame retardant on the combustion and viscosity-temperature properties of asphalt binder and mixture

To improve the compatibility and storage stability of Nano-composite flame retardant (NCFR) in asphalt, the surface of NCFR was modified by organic coating using four kinds of surfactants. First, the effect of surfactants on the surface activity of NCFR was evaluated. Then, the mechanism of surface enhancement modification of NCFR by surfactants was analyzed. Finally, the effects of surfactant-modified NCFR on the combustion characteristics and viscosity-temperature characteristics of asphalt were investigated. The results showed that the surfactants were coated on the surface of NCFR particles through intermolecular forces and chemical bonds. The surfactant coating modification of NCFR can improve the compatibility and storage stability of NCFR with asphalt. The surfactant further improves the asphalt fire safety by improving the NCFR dispersion, and the surfactant also effectively reduces the mixing temperature of flame retardant asphalt mixture. Surface modification of NCFR using surfactants is a multifunctional method of powder modification. [Display omitted] •The surface activity and microstructure of NCFR@Surfactant were tested.•The effect of NCFR@Surfactant on the combustion properties of asphalt binder and mixture was studied.•The effect of NCFR@Surfactant on the viscosity-temperature properties of asphalt binder and mixture was investigated.