Fabrication of A New Asphalt Binder for Road Applications

A new asphalt binder for road applications was prepared by mixing coal tar pitch and petroleum asphalt, and then modifying with compound modifier which was made by ourselves. Coal tar pitch and petroleum asphalt was 1:1 for weight. The modifier was made with epoxy resin, chopped carbon fiber which was modified by 3-Aminopropyltriethoxysilane (KH-550) and other auxiliaries. According to “Standard Test Methods of Bitument and Bituminous Mixture for Highway Engineering” JTG E20-2011, the properties of the modified asphalt (MA) were studied, and the best modification technology was mechanical shear of 3000r/min shear rate for 30mins at 110 °C, the amount of modifier was 5%. The properties of MA mixture were also researched, the performance of AC-20 mixture can meet the JTG F40-2004 “Specification for construction of highway asphalt pavement” in the relevant requirements. The oil-stone ratio was 4.7%. The requirement of dynamic stability was ≥ 800n/mm, the wheel tracking test showed the MA mixture exhibited a value of 1323n/mm, which meet the requirement. The MA mixture low-temperature property was studied by the beam bending test, the results indicated a higher value than the AH-70 mixture standard. The Freeze-thaw split test demonstrated the MA mixture water stability meet the requirement for asphalt. In all, a new asphalt binder for road applications was obtained by mixing coal tar pitch and petroleum asphalt, its properties meet the standard of AH-70 and its mixture. The modifier was added for 5% and the effect was best.