Increasing the thermal stability of paving asphalts

Abstract

A comparative analysis of domestic and foreign standards and technical specifications for paving asphalts is reported. A LUKOIL -Nizhegorodnefteorgsintez OAO draft corporate standard (DCS) for viscous paving asphalts which totally agrees with the foreign specifications was developed. Data from a pilot-industrial run on manufacture of commercial BND asphalt that satisfies the requirements of the DCS and is characterized by elevated plasticity and thermal stability are reported. The compositions of the feedstock and commercial asphalt and the process conditions of oxidation of vacuum resid were refined.The modern paving industry imposes stiff requirements on all materials used in construction and maintenance of highways, including paving asphalts and other binder materials made from them. Despite the enormous amount of data published in the scientific and technical literature, the quality level of viscous paving asphalts and the list of quality indexes and validation of the standards for them are still being debated.The state of the roads in our country shows that the lifetime of newly constructed and overhauled road surfaces almost universally fails. According to the data from Voronezh Oil Refinery's RosDor SRI, important erosion and peeling begin in the first year of use, while the lifetime of surfaces abroad is 18 years. In addition, the problem of bringing the domestic standards into agreement with the foreign standards has still not been solved. There is no correlation between the requirements for asphalt concretes and the quality indexes included in the standards for asphalt, and problems related to their production technology require solution.The requirements in foreign standards for paving asphalts are generalized and the necessity of changing the domestic standards and bringing them into agreement with the requirements in the foreign standards is justified ____________________________________________________________________________________________________ LUKOIL -Nizhegorodnefteorgsintez OAO. Moscow State Academy of Precision Chemical Engineering.