Hot in-place asphalt pavement recycling construction method involving layered heating, raking and moving-type blending

Abstract

The invention discloses a hot in-place asphalt pavement recycling construction method involving layered heating, raking and moving-type blending. The method comprises the following steps: heating the asphalt pavement at a surface layer until the temperature is 70-80 DEG C, then raking the asphalt pavement at the surface layer, and collecting to form first recycled materials; heating the asphalt pavement at an inner layer until the temperature is 70-80 DEG C, then raking the asphalt pavement at the inner layer, and collecting to form second recycled materials; mixing the first recycled materials, the second recycled materials and a new asphalt mixture together, and heating to 140-160 DEG C to obtain a mixture; and uniformly spreading the mixture to the pavement, and densely rolling to obtain a recycled asphalt pavement. According to the invention, a two-layer heating and two-time raking way is adopted, so that the heating efficiency is obviously improved; compared with the temperature of 140 DEG C required for traditional asphalt heating, the temperature is obviously reduced, so that black asphalt dust generated by high temperature does not exist; and the recycled pavement is heated more uniformly, so that the heating fuel can be greatly saved, and social and economic benefits are remarkable.

Description

technical field [0001] The invention relates to an asphalt pavement construction method, in particular to an in-situ thermal regeneration construction method of the asphalt pavement with layered heating, raking and moving mixing. Background technique [0002] At present, the existing domestic and foreign pavement in-situ thermal regeneration heating methods mostly adopt the method of directly heating the original pavement. Since the recycled surface layer is generally 4-6 cm thick, it takes a certain amount of time and enough energy to transfer the heat energy to the bottom. The problem is that the temperature of the 1-2 cm thick asphalt mixture on the top of the asphalt pavement is too high, generally reaching 200 °C. However, the temperature of the asphalt layer at the lower 3-6 cm is only about 80°C, and the uneven heating of the overall pavement is very serious; three heating machines are needed to reheat the reclaimed pavement back and forth to reach the construction te...

AI Technical Summary

Problems solved by technology

Since the recycled surface layer is generally 4-6 cm thick, it takes a certain amount of time and enough energy to transfer the heat energy to the bottom. The problem is that the temperature of the 1-2 cm thick asphalt mixture on the top of the asphalt pavement is too high, generally reaching 200 °C. However, the temperature of the asphalt layer at the lower 3-6 cm is only about 80°C, and the uneven heating of the overall pavement is very serious; three heating machines are required to heat the regenerated pavement back and forth to reach the construction temperature, resulting in a lot of waste of fuel; asphalt pavement will generate a lot of Black asphalt smoke and dust, polluting the environment, neither economical nor environmentally friendly

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