Preparation and characterization of coal gangue modified road asphalt

Abstract

Coal gangue is one of the largest industrial wastes in China, a large number of coal gangue accumulation not only occupies too much land area, but also causes surrounding land and air pollution. In this paper, the coal gangue samples were activated at first, and then the coal gangue powder was modified by adding coal gangue powder to road asphalt with the ratio of 0.5 and 1.2, and the penetration, softening point and ductility of the modified asphalt were tested. The results show that the viscosity, strength and softening temperature of modified asphalt can be improved by adding coal gangue powder into asphalt. With the increase of the amount of coal gangue powder in asphalt, the change of penetration and softening point of asphalt will be greater, and the strength of asphalt will also increase, but it will also make the toughness of asphalt worse. By adjusting the powder-binder ratio, the modified asphalt can adapt to different environments and use conditions, so that it can be widely used.