Three Basic Processes For Hot-In-Place Recycling

2023-11-17 11:02:00 ENUO

Raking and shaping process

The old road surface will be loosened and resurfaced to eliminate ruts and diseases on the original road surface. At the same time, the cross slope and drainage conditions of the road surface are improved. According to the asphalt recycling standards promulgated by the ARRA Association, the surface recycling process is most suitable for road surface dressing (shaping) and maintenance operations to improve driving quality. Also works well on mild potholes, oil spills, ruts, washboards (wrinkles), jostling (dials), cracks and other pavement blemishes. This process is not suitable for addressing skid resistance, shoulder collapse, edge cracks, fatigue cracks, discontinuous cracks or pavement strength issues.

Pavement resurfacing process

A process that loosens the original road surface, spreads a new material layer on it, and then compacts the two material layers simultaneously. This process is used to restore road friction, improve cross slope, eliminate ruts, and improve road strength. This process can pave a very thin asphalt wearing layer, so when the ordinary overlay method is not applicable, the resurfacing method can also be applied. The resurfacing process can be used to reinforce the pavement. Due to the thermal bonding surface formed between the layers, this process can achieve a very thin overlay. For excellent asphalt mixtures, the overlay thickness can be reduced to 12mm, while the conventional overlay thickness is 2-3 times that. Thin-layer resurfacing methods are generally more economical than other hot-in-place recycling operations involving overlays. Practice has proved that the resurfacing method is also suitable for municipal maintenance projects. Although the regeneration unit operates at a slower speed than conventional milling-paving operations, it disrupts traffic only once and takes up less total traffic time. In a more practical operation, for a designated parking lot or driveway, the resurfacing train blocks traffic for only 10-15 minutes, after which the road surface is immediately usable. The resurfacing method is most suitable for dealing with problems such as looseness, potholes, various cracks, or deterioration of skid resistance and ride quality. Resurfacing is also effective for treating oily spots, ruts, washboards, waves and other surface blemishes.

Pavement remixing process

A hot-in-place recycling method that improves the characteristics of existing pavement by adding new hot mix, asphalt or recycling additives, mixed, paved, and compacted on site. The remixing process is suitable for the reconstruction of aging pavement, the recovery of unstable worn pavement and the improvement of pavement strength. The remixing process is the most suitable hot-in-place regeneration technology for pavement improvement. This process is the most economical and effective solution for treating ruts, looseness, aging and other pavement defects within 50mm. Asphalt regeneration using the remixing method can be improved (modified) including aggregate gradation, anti-slip coefficient, asphalt content, asphalt rheological properties, mixture stability and voids, etc. In this process, a preheating machine and a heated milling machine heat the road surface to a depth of 37-50mm, loosen the road surface and form a bank-like pile, which is then transported to a truck-mounted mixing pot. In the mixing pot, the regenerated old material is evenly mixed with the regenerant, additives or new hot mix. The remixing method is most suitable for treating pavement diseases such as potholes, oil spills, washboards, bumps, rutting, peeling, aging, etc. that occur within a depth of 50mm. This process can also be effectively used to treat various problems such as loose crack surfaces and reduced friction resistance.