A kind of high-viscosity asphalt and its preparation method

Abstract

The invention discloses novel high viscosity asphalt and a preparation method thereof. The novel high viscosity asphalt comprises the following raw materials in parts by weight: 100 parts of base asphalt with high asphaltene content, 0.1-1.2 part of polyphosphoric acid, 2-12 parts of a ductility improver mother liquid, 1-8 parts of a dispersant, and 0.2-0.5 part of a coupling agent. The preparation method comprises the following steps: adding the polyphosphoric acid in the molten base asphalt to perform a chemical modification reaction, then adding the ductility improver mother liquid, continuing to react, and finally adding the dispersant and the coupling agent to continue to react for a period of time to prepare high viscosity asphalt, wherein the whole process is performed under a highs-speed stirring condition. The high viscosity asphalt is high in 60-degree dynamic viscosity, high in softening point, high in low-temperature ductility, stable to store, and good in adhesion to aggregates, has excellent high temperature stability, excellent low temperature anti-cracking performance, excellent anti-fatigue performance and excellent water resistance, is especially suitable for high-temperature humid areas, areas with relatively high diurnal temperature difference, and paving of heavy-duty roads and drainable pavements, effectively prevents common pavement damages such as pavement rutting, pavement upheaval, pavement fatigue cracking, pavement cold cracking and water encroachment on pavements, and prolongs the service life of the pavement.

Description

technical field [0001] The invention is suitable for the field of petroleum asphalt, and in particular relates to a high-viscosity asphalt and a preparation method. Background technique [0002] With the increasing traffic volume and axle load and the high temperature in summer, the fluidity damage and channelized traffic on the asphalt pavement caused by the combined effect of high temperature and wheel rolling are becoming more and more serious, and a large number of rutting, wrapping and cracking appear on the asphalt pavement and other damage. Rutting damage on asphalt pavement causes excessive deformation of the pavement, affects the smoothness of the pavement, weakens the strength of the surface layer and the overall structure of the pavement, and induces other pavement diseases. Long-term practice has shown that there is a good correlation between the dynamic viscosity of asphalt materials at 60°C and the strength and rutting resistance of asphalt mixtures at the hig...

AI Technical Summary

Problems solved by technology

However, due to the differences in molecular weight, density, viscosity, etc. between most polymer materials and asphalt, it is difficult to disperse the polymer in asphalt, and it is not completely compatible with asphalt, resulting in poor storage stability of the modified asphalt system at high temperature and easy separation. layer, which affects the quality of modified asphalt and the normal construction and service life of asphalt pavement

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