High-performance warm-mixed special asphalt based on hot in-place recycling and mixture of high-performance warm-mixed special asphalt

Abstract

The invention belongs to the technical field of road engineering materials, and particularly relates to high-performance warm-mixed special asphalt based on hot in-place recycling and a mixture of the high-performance warm-mixed special asphalt. The high-performance warm-mixing special asphalt comprises the following main components: 100 parts of matrix asphalt, 2-4 parts of an SBS modifier, 1-3 parts of an SBR modifier, 1-2 parts of EVA, 0.2-0.8 part of a coupling agent, 0.3-0.6 part of an anti-stripping agent, 0.16-0.36 part of a stabilizer and 4-10 parts of a high-permeability asphalt warm recycling agent. The warm-mixed special asphalt is small in high-temperature viscosity, the construction workability of an asphalt mixture is good at the temperature of 130-140 DEG C, light components in the special asphalt can rapidly permeate in the waste asphalt, the effects that soft asphalt and hard asphalt are mutually fused and high-temperature and low-temperature performance are complementary are achieved, the compaction effect of an asphalt pavement is effectively guaranteed, and the pavement quality is improved. And the method plays an important role in reducing or even avoiding early damage of the asphalt pavement under the action of driving load, improving the maintenance quality of the pavement and prolonging the service life of the pavement.

Description

technical field [0001] The invention belongs to the technical field of road engineering materials, and in particular relates to a high-performance warm-mix special asphalt based on in-situ hot regeneration and a mixture thereof. Background technique [0002] According to the 2020 Statistical Bulletin on the Development of the Transportation Industry, the proportion of highway maintenance mileage in my country's total highway mileage has continued to rise. By the end of 2020, the national highway maintenance mileage will be 5.144 million kilometers, accounting for 99% of the total highway mileage. my country's highways have entered a period of large-scale maintenance from the period of rapid construction. 6% of the roads need to be renovated every year, and only 160 million tons of milling materials are produced on the main roads. At present, the amount of milled material in the factory-mixed heat regeneration technology is mostly 30%, and the utilization rate of waste materi...

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Problems solved by technology

[0004] However, although the hot-in-place regeneration technology has been paid attention to and popularized in my country in recent years, due to equipment and process limitations, compared with fresh asphalt mixture or even factory-mixed hot regeneration technology, the technical research and practical application of hot-in-place regeneration are still limited. There is a large gap, especially when the hot-in-place recycling technology is applied to the modified asphalt pavement such as the surface layer, due to insufficient on-site temperature, it is difficult to ensure effective compaction of the pavement, thus affecting the road performance and durability of the recycled mixture

[0005] When hot-in-place recycling technology is applied to modified asphalt pavement, there are many problems and deficiencies, including: conventional regenerants are not suitable for the regeneration of aged SBS modified asphalt; high RAP content limits the road performance and Durability properties; insufficient compaction of recycled mixes at field temperatures

These problems have greatly affected the treatment effect of hot-in-place recycling technology on modified asphalt pavement

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