A production process of hot-mix fully recycled asphalt mixture

Abstract

The invention relates to the technical field of production of recycled asphalt mixture, in particular to a production process of hot-mix fully recycled asphalt mixture. The process includes the following steps: Step 1, planing and milling the RAP aggregates into three grades of 0-3mm RAP aggregates, 3-5mm RAP aggregates, and larger than 5mm RAP aggregates; Step 2, mixing 0-3mm RAP aggregates with pure asphalt Stir and mix and heat to form a fluid mixed asphalt; step 3, feed aggregates larger than 5mm RAP from the feed inlet of the primary drum for heating, add 3‑5mm RAP aggregates from the regeneration ring, 3‑5mm RAP aggregates and larger than 5mm RAP aggregates Materials are mixed and contacted for heat exchange, and flame indirect radiation heating is carried out at the same time to form thermally recycled aggregates; step 4, fluid mixed asphalt and thermally recycled aggregates are stirred and mixed to obtain high-quality finished asphalt mixtures. In the finished material, RAP aggregate can be added in a larger proportion, and it can be fully recycled and mixed in a factory. It can be applied to various road grades and reduce production costs.

Description

technical field [0001] The invention relates to the technical field of production of recycled asphalt mixture, in particular to a production process of hot-mix fully recycled asphalt mixture. Background technique [0002] When the asphalt pavement reaches the designed service life, its integrity will not be able to meet the road demand. However, by recycling its waste, that is, the asphalt mixture still has a high value of use. Asphalt regeneration technology can make the raw materials meet the pavement design requirements again. Save a lot of production costs and achieve sustainable development. Plant-mix heat recycling technology is the most widely used production method in asphalt recycling process. The existing plant-mix heat regeneration is to achieve the quality of asphalt mixture required by different pavement grades by mixing primary aggregates and recycled asphalt pavement aggregates. At present, RAP aggregates on the market are generally less than 20mm after milli...

AI Technical Summary

Problems solved by technology

Plant-mix heat recycling technology is the most widely used production method in asphalt recycling process. The existing plant-mix heat regeneration is to achieve the quality of asphalt mixture required by different pavement grades by mixing primary aggregates and recycled asphalt pavement aggregates. At present, RAP aggregates on the market are generally less than 20mm after milling. Because of the viscosity problem of RAP aggregates and the problem of easy aging when heated, it cannot be as finely graded as the original aggregates, and it is difficult to meet the needs of high-grade pavement for grading.

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