Bio-based non-viscous wheel tack coat and preparation method thereof

The invention belongs to the technical field of emulsified asphalt and relates to a bio-based non-viscous wheel tack coat and a preparation method thereof. The method comprises the preparation steps of mixing hard asphalt with biomass heavy oil under the shear conditions of 120-130 DEG C and 3,000-5,000r/min according to ratio for 20-30min to obtain biological asphalt; shearing the biological asphalt, epoxy resin and nano silicon dioxide at 110-120 DEG C evenly to obtain modified biological asphalt; and preparing the bio-based non-viscous wheel tack coat from the modified biological asphalt at 130-140 DEG C and an emulsifier solution at 50-60 DEG C through a colloid mill according to the ratio. Compared with the prior art, the tack coat prepared through the method is high in emulsifying speed, non-viscous to a wheel, and not easy to fall off, enough interlayer bonding strength can be provided, the interlayer disease generated by interlayer shear force of an asphalt pavement is effectively improved, and the bio-based non-viscous wheel tack coat is low in cost and has important application value and economic benefit.