High-dosage RAP low-temperature hot mix plant recycled SMA-13 asphalt mixture and preparation process thereof

Through the large amount of RAP low-temperature plant mixing and heat regenerating SMA-13 asphalt mixture, using modified steel slag aggregate and low-temperature modifier, the energy consumption and performance degradation when RAP is high is solved, and efficient mix performance improvement and environmentally friendly construction are achieved.

CN120441235AActive Publication Date: 2025-08-08LIAOCHENG TRANSPORTATION DEV CO LTD +1
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Patent Information

Application Number
CN202510643713.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-05-19
Publication Date
2025-08-08
Estimated Expiration
2045-05-19

AI Technical Summary

Technical Problem

In the prior art, the utilization rate is low when the RAP dosage is less than 30%, the energy consumption is high when it is higher than 30%, and the performance of the mixture is degraded, especially in terms of high-temperature crack resistance and water damage resistance. The high traditional regeneration temperature leads to an increase in energy consumption and pollution emissions.

Method used

The SMA-13 asphalt mixture is regenerated with high-volume RAP low-temperature factory mixing heat. By using modified steel slag aggregate, SBS modified asphalt, low-temperature asphalt modifier and homemade asphalt regenerator, combined with the low-temperature construction technology, the high-low-temperature performance and road performance of the mixture are improved.

Benefits of technology

It achieves a high utilization rate of 70% RAP dosage, reduces energy consumption and pollution emissions, improves the high-temperature rutting resistance and low-temperature crack resistance of the mixture, and meets the needs of heavy-duty traffic roads.

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Abstract

The invention belongs to the technical field of asphalt mixtures, and relates to a high-dosage RAP low-temperature hot mix plant recycled SMA-13 asphalt mixture and a preparation process thereof, and the low-temperature hot mix plant recycled SMA-13 asphalt mixture comprises the following components by weight: 50-60 parts of an asphalt mixture reclaimed material; 30-40 parts of modified steel slag aggregate; 3-5 parts of SBS modified asphalt; 0.02 to 0.06 part of a low-temperature asphalt modifier; 3-8 parts of superfine slag powder; 0.2 to 0.5 part of lignin fiber; and 1-2 parts of a self-made asphalt regenerant. The limitation of the traditional RAP doping amount is broken through, the highest doping amount reaches 70%, the steel slag recycled aggregate replaces natural aggregate, the consumption of raw materials and the emission of waste are remarkably reduced, and the steel slag recycled aggregate meets the target requirements of the new era of dual-carbon strategy and sustainable development; and the method is particularly suitable for winter construction, heavy traffic roads and green road construction in iron and steel industry areas, and has technical advancement and engineering practicability.
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