The effect of two-phase mixing on the functional and mechanical properties of TPS/SBS-modified porous asphalt concrete

A two-phase mixing method was developed to improve the mechanical properties of hot mix asphalt. The coarse aggregate was precoated with an optimal amount of binder, followed by mixing with fine aggregate, filler, and the remaining amount of bitumen was added. Styrene-butadiene-styrene (SBS) (4%) and Tafpack super (TPS) (6%, 8%, and 10%) were used as bitumen modifiers. The results showed that the two-phase mixing method improved the mechanical properties of the porous asphalt, including splitting, fatigue, and rutting performances. The effects of the method on noise absorption and drainage of the porous asphalt concrete were negligible.