Preparation of mixed asphalt by blending coal tar pitch with petroleum asphalt

The effects of mixing conditions on the properties of mixed asphalt were examined, including mixing temperature, mixing time, stirring method and coal pitch particle size. Especially, the anti-aging properties, rheological properties and storage stability of the selected samples were investigated. The results show that mixed conditions have an important effect on the dispersion of coal pitch in petroleum asphalt. With the increasing of mixing temperature and time, the dispersion of coal tar pitch in the petroleum asphalt is enhanced, but it also brings about the aging of based asphalt. The particle size of coal pitch has more important effect on the properties of mixed asphalt. The tests of the selected samples indicate that mixed asphalt have good properties of rheological behavior at high temperature, anti-oxidation aging and storage stability.