A kind of recycled asphalt and its preparation method

Abstract

The invention discloses regenerated asphalt and a preparation method thereof. The regenerated asphalt is prepared from, by weight, 100 parts of recycled asphalt, 20-40 parts of extract oil, 10-25 parts of catalytic cracking oil slurry, 2.0-8.0 parts of thermoplastic rubber, 0.5-4.0 parts of a ductility improver, 0.5-1.5 parts of polyphosphoric acid and 0.5-1.5 parts of a stabilizer. The method is especially suitable for regeneration of aged asphalt obtained during waste asphalt pavement material recycling, the performance of the regenerated asphalt meets the technical requirements of road asphalt, and the regenerated asphalt is used for paving an asphalt pavement.

Description

technical field [0001] The invention relates to a reclaimed asphalt and a preparation method thereof, in particular to a reclaimed asphalt regeneration method for waste asphalt pavement. Background technique [0002] With the rapid development of highway transportation, the construction of asphalt pavement has also increased rapidly. According to the design service life and actual service status of China's expressways, the expressways built successively after the 1990s have entered the period of major and medium repairs, with an annual rate of about 12%. The asphalt surface of highways needs maintenance, and it is growing at a rate of 15% per year. If the excavated and milled old asphalt mixture is discarded, on the one hand, it will cause environmental pollution, and on the other hand, it will be a waste of resources for a country like China, which is extremely scarce in high-quality asphalt, and a large amount of new stone will be used. Mine can also cause serious damage ...

AI Technical Summary

Problems solved by technology

CN201210411170.X provides an asphalt rejuvenator and its preparation method, adding 40% to 65% catalytic cracking oil slurry to 30% to 50% heavy oil, stirring at a low speed for 0.5 to 1.0 hours, and then adding 1% to 5% polymer Disperse with 1% to 5% modifier at high speed for 0.5 to 1.0 hours, and cool to room temperature to obtain asphalt rejuvenator. The first disadvantage is that the heavy oil component contains high colloid and asphaltene content, which is not conducive to regenerant Penetration and peptization in aged asphalt, the regeneration efficiency is low, and the second is that the modifiers contained in orthophosphoric acid, polyphosphoric acid, polyphosphoric acid, etc. are added in a large amount, and the existence of excessive acidic substances will make oil slurry and heavy oil The more active chemical components in the medium continue to undergo polycondensation reaction and become macromolecular asphaltene, which makes the performance of the regenerant unstable, the aging resistance and permeability deteriorate, and the regeneration efficiency decreases