KNOW-HOW

Pre-spraying is out of date.

Spraying emulsions and paving thin layers in one operation

Many paving operations call for a tack coat of bitumen emulsion to be applied on the binder course prior to paving the final surface course layer. Modern machine technology capable of spraying bitumen emulsion and paving the surface course layer in one single operation is therefore needed not only for paving thin layers in hot application but, to an increasing extent, also in conventional road construction. The Super 1800-2 paver with SprayJet module from Vögele is such a machine, as it is capable of effecting both work steps in one simultaneous operation.

Conventional machine for special jobs

The design of the Super 1800-2 with SprayJet module is based on Vögele’s standard paver model Super 1800-2. That makes the machine an ideal candidate not only for paving thin layers in hot application, but also for carrying out any job in road construction that requires bitumen emulsion to be applied prior to paving, as well as for conventional road construction operations which do not involve spraying. The Super 1800-2 with SprayJet module is also eminently suitable for use as a conventional road paver, as the SprayJet module can be detached in just a few swift moves.

Innovative spraying technology improves economic efficiency

One of the major technical innovations offered by the Super 1800-2 with SprayJet module is the capability of precisely metering even extremely small spraying quantities of no more than 0.2 kg/m², which can be applied even when working at low paving speeds. A steady spraying pressure of 3 bar and double-slit spray nozzles enable the spraying operation to be carried out with almost no contamination or formation of spraying mist, resulting in a uniform spray pattern.

Preventing contamination

The tank is heated to keep the paver ready for operation, and to maintain the temperature of the emulsion at precisely the selected value. As spraying of the bitumen emulsion and the subsequent paving operation are carried out in immediate succession, supply trucks or other site vehicles will not come into contact with the emulsion, which effectively prevents the contamination of surrounding streets. All that plays a major part in terms of producing a permanent and perfect bond between the old and new pavement layers.