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Research of blended petroleum asphalt and coal tar pitch and its emulsification performance
SUN Huadong, FAN Weiyu, ZHANG Rui, DONG Fuqiang, KONG Xiangjun, LIANG Ming, QIAN Chengduo, NAN Guozhi
(State Key Laboratory of Heavy Oil Processing in China University of Petroleum, Qingdao 266580, China)
Abstract:
Two types of coal tar pitches and Qinhuangdao AH-90 petroleum asphalt were blended and emulsified. The influences of coal tar pitch types and dosages on the properties of blended asphalt and emulsified asphalt were investigated. The experimental results show that the coal tar pitches containing a lot of toluene insoluble (pulverized coal) lead to the ductility at 25 ℃ of the blended asphalt and evaporation residue of the emulsified asphalt decrease significantly, which cannot meet the specification. When the maximal dosages of coal tar pitch 1# and 2# are 25% and 20%, the 1d and 5d stability results of the emulsified asphalts meet the standard. At the same coal tar pitch dosage, the blended asphalt and its emulsion evaporation residue by adding coal tar pitch 1# have less penetration at 25 ℃, and have larger ductility at 25 ℃ and softening than those by adding 2#. With the dosage of the two coal tar pitches increasing, the blended asphalts and the emulsion evaporation residues present the reduced tendency for ductility and penetration at 25℃, while the softening point shows increasing trend.
Key words:  petroleum asphalt  coal tar pitch  blended asphalt  emulsification property  performance of evaporation residue