In the course of inversion, the ancient oil was transformed into maltha and asphalt (weakly altered bitumens) that were altered into epiimpsonites during the repeated subsidence.
Results of the study of natural organic matter (OM) represented by classes of solid and high-molecular-compounds (resin, ozokerite, asphalt, kerite, graphite, and others) are presented.
In view of no apparent relationship between asphalt ductility and paving performace, it is recommended to include the brittle temperature in the asphalt specification in order to warrant good viscoelasticity at low temperature.
The commercial production of high performance carbon fibre from mesophase asphalt will be one of the main technical routes hereafter. The cost for production of this kind of carbon fibre is only 1/3 that from polyacrylonitrile.
A new process for producing roofing asphalt from petroleum residua by steam cracking and condensation has been studied in the laboratory. Three different stocks, i. e. Shengli and Renqiu vacuum residua and PDA asphalt of Renqiu vacuum residue,were used.Experiments were carried out in a 5 liter reactor at temperature 400 to 415℃ under atmospheric pressure and in the presence of superheated steam, while the reaction time was selected according to the softening point of the asphalt. Besides t...