Asphalt pavement regeneration technology

03 Dec 2019 09:00
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There are many methods for regenerating old asphalt pavement. The method of regenerating old asphalt pavement can be summarized into two categories: thermal regeneration and cold regeneration.

Thermal regeneration can be divided into hot mix regeneration and in situ heat regeneration; cold regeneration can be divided into cold mix regeneration and in situ cold regeneration.

According to the data released by the European Asphalt Pavement Association, the asphalt pavement regeneration methods in Europe and the United States are mainly based on heat and warm mix regeneration. The International Economic Cooperation and Development Organization has reported on the road recycling of 14 countries (asphalt part) and hot mix regeneration (factory Hot regenerative regeneration is a commonly used regeneration method. Cold regeneration generally accounts for only a small percentage, and other regeneration methods are only used in a few countries.

1.
Thermal regeneration
Thermal regeneration refers to heating the old material during the regeneration of the old asphalt material, adding other regeneration additives as required, and then performing other regeneration processes.

Thermal regeneration can be divided into hot mix regeneration and in situ heat regeneration.

1 hot mix regeneration
The recycled asphalt pavement material (RAP) is transported to the asphalt mixing plant (field, station), crushed, sieved, and mixed with new aggregate, new asphalt, regenerant (if necessary), etc. in a certain proportion. The technology of reclaiming paving pavement.

2 Geothermal regeneration
Geothermal regeneration technology was once considered a revolution in the road industry; however, future practice has proved that there are many limitations in on-site thermal regeneration: small processing thickness; unable to effectively adjust the mix ratio of recycled mix, mainly used for surface regeneration It is difficult to guarantee the quality requirements for pavements with uneven pavement thickness or large changes in quality conditions.

China's asphalt pavement diseases are mainly structural damage such as water damage and cracks. Surface treatment is difficult to solve these problems. Therefore, geothermal regeneration equipment should not be promoted in China.

When the geothermal heat is regenerated, the asphalt pavement should be heated and milled, and a certain amount of new asphalt and other regenerants should be added on the spot. After hot mixing, paving, rolling and other processes, the unit is complex and complicated. There are more than one unit combination to carry out the operation, and the investment in the first phase of the equipment is also large.

The geothermal regeneration equipment can be divided into two types: remixing regeneration and resurfacing regeneration.

2.
Cold regeneration
Cold regeneration means that the old material is not heated during the regeneration of the old material of the asphalt pavement, and the emulsified asphalt and other additives for restoring the performance of the old material are added as required, and then other cold regeneration processes are carried out.

Cold regeneration can be divided into cold mix regeneration and in situ cold regeneration.

1 cold mix regeneration
The recycled asphalt pavement material (RAP) is transported to the mixing plant (field, station).

After crushing, sieving, and a certain proportion with new aggregates, asphalt-based recycled binders, active fillers (cement, lime, etc.), water, etc., mixed at room temperature, asphalt pavement regeneration technology at room temperature.

2 cold regeneration on site
On-site cold milling, crushing and sieving (if necessary) with a local in-situ cold recycling equipment, incorporating a certain amount of new aggregates, recycled binders, active fillers (cement, lime, etc.), water Etc., through the process of mixing, paving, rolling, etc. at normal temperature, the technology of regenerating the old asphalt pavement at one time.

It includes two methods of in-situ cold regeneration of asphalt layer and full-surface cold regeneration in situ.

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