Recyclers are special road equipment, used for repair and reconstruction of highways. Work recycler is indispensable in the elimination of damaged roadway, associated with the appearance of cracks in the road surface. The massive appearance of recyclers took place in the 80-ies. Their work differed from those of road-building machines that were used earlier. Before the advent of recyclers repair of roads was trusted to planers. This technique was sorting out the damaged road surface, picking up layer by layer. Using recyclers the need of sectional dismantling became unnecessary. In other words, recyclers combined all the capabilities of previous road machinery.
Machines of American and German manufacturing are was very popular all over the world: Caterpillar, Terex-CMI, Roadtec, Wirtgen, Bomag-JCB.
Working width of the roadway of recyclers is different. The larger percentage of the market is occupied by recyclers with exponents up to 3 meters.
The driver recycler can adjust independently the speed of the machine. This is possible thanks to the hydraulic drive of machines.
The main working tool of the recycler is a mixing and milling drum. The drum can be rotated along the rotation of the wheels or against it due to a mechanical drive.
In the role of the binder are:
- A mixture of water and cement;
- A mixture which contains bitumen;
- Foamed bitumen;
- Various additives.
Typically, recyclers have only distribution pipes (ramps) and pumps for entering liquids – water and liquid bitumen. To enter the foamed bitumen to the ramp to the nozzles hot bitumen (with a temperature of 180 ° C), a small amount of water, and smothered the air are fed. Surface of films of foamed bitumen is enormous, and the viscosity of bitumen at the same time dramatically decreases, which promotes mixing of bitumen and crushed material of the roadway.
To enter the cement trucks are usually used with attachments for the dosing and distribution of cement on the surface of the processed pavement.
Company Wirtgen sets embedded distributor cement hopper capacity of 4 m3 in the recyclers WR 2500SK. The company produces for the assembly recycler’s mobile (trailer) mixing plant WM 1000 for the receipt and transmission of the vehicle’s recycler of cement-water suspension. This eliminates dust formation in the worksite, improves the accuracy of dosing and mixing quality of the crushed material. This facility is equipped with a hopper for cement capacity of 25 m3 and a tank for water capacity of 11 m3. To ensure a better quality of mixing material with crushed pavement binder to recyclers WR 4200 after milling and mixing drum longitudinal double-shaft paddle mixer is set.
Usually the mixture obtained in the recycler is distributed using the posterior wall of the casing milling and mixing drum, and in some cases additional profiling is produced using a motor grader. However, the processing of thin layers of coating (40-60 mm) is not enough to ensure continuity of thickness and flatness of the processed layer coating.
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