Gulf Construction Online - Vogele adds more power to paver

Roads & Bridges

Two spray pavers are working in <br>echelon ... on a German motorway.

Two spray pavers are working in
echelon ... on a German motorway.

Vogele adds more power to paver

01 February 2010

Vogele has boosted its Super 1800-2 tracked pavers with the addition of the SprayJet module, enabling its use as a spray paver.

The conventional paver fitted with the SprayJet module is an advanced spray paver capable of spraying bitumen emulsion and paving asphalt wearing course almost simultaneously in a single pass, says a spokesman for the German manufacturer.

“The spray paver is ideal for placing thin overlay on spray seal or tack coat, hot on hot – a particularly cost-efficient method for rehabilitating asphalt pavements,” he adds.

The area to be re-surfaced is first sprayed with a polymer-modified bituminous emulsion (type C 60BP1-S) before a thin asphalt overlay, just 2 cm to 4 cm in thickness, is placed by the spray paver.

This paver is also an economical and clean alternative for non-specialised road construction firms. Roads of all classes can be surfaced and a perfect bond between layers is achieved due to the spreading of bituminous emulsion, the spokesman adds.

Elaborating on the flexibility of the unit, he says: “The modular design of the Super 1800-2 allows the SprayJet module to be mounted or removed within just six hours. This allows the machine to be used as a spray paver or a conventional asphalt paver if no spray jobs are scheduled for a prolonged period of time.”

One major advantage of the Vogele spray paver is the possibility to vary the rate of spread for the bituminous emulsion in order to precisely match the base.

The 1800-2 ... precise rate of spread without getting emulsion on the curb.

“The German standard governing the paving of traffic areas with asphalt (ZTV Asphalt), for instance, specifies 250 gm to 500 gm of emulsion per sq m when spraying the asphalt binder course for pavements of the categories SV, I to III, in order to achieve a sufficient bond between layers,” the spokesman continues.

“The rate depends on whether the base being sprayed has been milled or is highly porous. In other countries and for specific applications, the required rate of spread may far exceed 1,000 gm per sq m.

“The innovative spray technology of the Super 1800-2 with SprayJet Module meets these requirements with ease. For example, the rate of emulsion to be spread can be set from 200 gm to 1,600 gm per sq m by simply selecting the desired volume on the spray module’s display panel.”

Vogele offers three different sizes of spray nozzles for different throughputs in order to finely apply the emulsion to the base.

The Super 1800-2 is available for spray widths of 5 m or 6 m. Both versions are equipped with five spray bars. The spray bar in the front comes with six spray nozzles and is located between the machine’s crawler tracks right behind the push-rollers. Two articulated spray bars are installed on each side of the machine. The lengths of these bars – and thus the number of spray nozzles fitted – depend on the maximum spray width of the module.

On the 5 m version, each of these bars has five nozzles, while the slightly longer lateral spray bars of the 6 m version are each equipped with seven nozzles. A short spray bar with two nozzles is located directly behind each crawler track. This arrangement of the spray bars allows full coverage of the base with emulsion, without a gap, even if the pave width varies.

The Super 1800-2 ... can be used as a spray paver or a conventional paver.

The spokesman elaborates: “Very similar to the function of an inkjet printer, the nozzles of the Super 1800-2 with SprayJet Module do not spray continuously but in pulsed operation. The spray pulses are controlled automatically according to the selected rate of spread, pave speed and pave width. This achieves a uniform emulsion film across the full pave width without overlaps.

“Vogele’s process also substantially reduces the formation of spray mist. This is because, on the one hand, a very low spraying pressure of no more than 3 bar is used and, on the other hand, the spray droplets are larger. Thus, the spraying technology of the Vogele SprayJet system is beneficial to the job site teams, too, as emulsion fumes are reduced to a minimum.”

The Vogele spraying technology comes into its own in municipal road construction, he says. “Control over the rate of spread, the individually activated/deactivated nozzles and the fine emulsion film all allow spraying along road curbs without getting emulsion on the curb.

And as the Super 1800-2 with SprayJet module paves the asphalt onto the emulsion immediately after spraying, vehicles on the construction site never pass over the emulsion. Soiling of adjacent areas is thus avoided,” the spokesman says.

The Super 1800-2 with SprayJet module can be combined with an AB 500-2 or AB 600-2 Extending Screed. Both screeds handle pave widths up to 6 m. AB 600-2 has a basic width of 3 m and extends hydraulically up to 6 m. AB 500-2 builds up to its maximum width of 6 m with 75 cm bolt-on extensions. Both screeds are available in TV version (with tamper and vibrators) and in TP1 version (with tamper and 1 pressure bar) for high compaction.