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The A1 motorway is Austria’s main traffic artery, linking Salzburg – Mozart’s birthplace – with the capital of Vienna. Extremely high traffic volumes required the so-called “Westautobahn” to be widened to three carriageway lanes – and even to as many as six lanes on the section between Sattledt and the junction at Haid near Linz – in each direction. Over a total length of 19.7 km, this section of the A1 was expanded in concrete design.
The existing concrete pavement was used for the production of recycling granulate. A laser-controlled grader placed the material true to line and level, immediately followed by single-drum compactors of the 3000 series fitted with VIO drum which compacted the recycled mix. The VIO technology enables them to work with either oscillation or vibration. Working on the A1, they used the benefits offered by oscillation. This type of dynamic compaction is capable of achieving high degrees of density very quickly, therefore requiring fewer roller passes.
Where the existing construction materials lacked bearing capacity, the contractors decided to rely on a tried-and-tested system solution offered by Wirtgen: soil improvement using the soil stabilizer and cold recycler WR 2500. The WR 2500 recovered the existing material in 2.80 m long and just under 2.50 m wide sections each, adhering to the specified working depth of 20 cm with pin-point accuracy. The material was mixed with pre-spread cement and precisely metered quantities of water, all in one single machine pass. The water was fed into the soil stabilizer’s mixing chamber from a water tanker truck.
At an advance speed of between 15 and 20 m/min, the WR 2500 was operating in the lower range of its performance capacity. A powerful diesel engine provided the power needed by the 32-ton machine. Despite being a heavyweight, the recycler impresses with exceptional agility in repositioning and turning manoeuvres, which is owed to its finger-light hydraulic all-wheel steering.
Job site: A1 motorway, Austria
