Rheological properties and chemical analysis of nanoclay and carbon microfiber modified asphalt with Fourier transform infrared spectroscopy

► Asphalt binders blended with four nano/micro-modifiers were used. ► The complex shear modulus was measured with DSR. ► The chemical bonding of asphalt binders was analyzed through FTIR. ► The addition of four modifiers can delay the aging and oxidation effect.