Asphalt Pavement Thermal Regeneration Repair

2023-11-13 11:45:06 ENUO

The aging of asphalt pavement is mainly due to the reduction of light components in the asphalt and a small loss of stone. Thermal regeneration of asphalt pavement adjusts the chemical components of the aged asphalt in the old asphalt pavement by adding regenerants and restores the performance of the aged asphalt. At the same time, a small amount of fresh asphalt mixture is added to adjust the gradation of the original asphalt mixture to achieve the asphalt pavement regeneration effect.

The thermal regeneration combined unit is used to complete the thermal regeneration repair of asphalt pavement on-site, which can utilize 100% of the original pavement materials. There is no need to transport waste materials and waste storage sites, which can reduce environmental pollution. Hot-in-place regeneration technology can change individual mixture components to quickly complete the renovation of asphalt pavements with the optimal mix of asphalt mixtures. This pavement repair technology opens up road traffic as the project progresses, causing minimal disruption to traffic. It is currently widely used in developed countries.

During thermal regeneration of asphalt pavement, the original asphalt pavement is first heated and softened to facilitate raking, and then the raked asphalt pavement is fully mixed, and then paved and rolled.

New asphalt mixture and regenerant are added according to the required proportion. Usually the new asphalt mixture is controlled within 30% of the mass of the regenerated mixture. The addition rates of various materials are determined based on the performance analysis of the original asphalt pavement and its laboratory mix design.

According to the different processes used, on-site thermal regeneration can be subdivided into three types. That is, rake shaping regeneration, resurfacing regeneration and remixing regeneration.

1. Rake shaping regeneration

First use heating equipment to heat and soften the asphalt pavement, then use a rake device to rake and shape the pavement, add regenerant at the same time, and then compact it with a road roller.

2. Resurfacing regeneration

First, heating equipment is used to heat and soften the asphalt pavement, and then the old asphalt layer is milled. The difference is that the milled asphalt material is paved directly, and then a new layer of asphalt mixture is paved on top, and then compacted with a road roller.

3. Remixing regeneration

First, use heating equipment to heat and soften the asphalt pavement, and then use a milling machine to mill out the old asphalt layer. Then add regeneration agent according to a certain proportion and then add new materials used to adjust the assembly. After stirring, the mixture is collected and discharged to the paver for paving, and finally compacted with a road roller.