Wirtgen milling machines: A safe bet
Jörg Freitag, Regional Director at milling service provider SAT, a company in the STRABAG Group, coordinated the operations of the cold milling machines. The asphalt was removed layer-by-layer in order to separate the valuable milled material and permit optimum recycling later. The planners had already provided for sufficient lorry capacity, so the high-performance machines were able to really flex their mechanical muscles and achieved milling rates in excess of 200 t/h per machine. It was essential to the overall process that the milling work progressed quickly. A technician was on site just to make certain. "However, our workshop foreman didn't have to intervene – everything ran smoothly once again," summarized Jörg Freitag, as the last milling machines left the job site after 14 hours.
Logistics for experts: Three asphalt layers and five types of mix
The crews readied the first pavers and rollers while it was still dark so that they could commence the asphalt paving work on the completely milled sections come daybreak. Here, too, STRABAG deployed machines from the Wirtgen Group. Hamm compactors and rubber-wheeled rollers were used to compact the rehabilitated hydraulically bound base course, while Vögele pavers and Hamm rollers handled the lion's share of the asphalt paving work.
Coordinating the placement of five different types of mix from five mixing plants within just 36 hours was a huge logistical challenge. A total of 10,000 t had to be delivered to the right job site, supplying the right asphalt mix at the right time with as many as 30 lorries. Yet everything went without a hitch thanks to meticulous planning, clearly assigned responsibilities and the use of four Vögele SUPER 1900-2 pavers. And the results of the work were also impressive: "The Vögele pavers produce a top pavement quality, especially with large pave widths like on the A5, where the pave widths extended to 7.80 m. The screeds also achieve a high degree of uniform pre-compaction across the entire width," said Technical Division Manager Georg Müller when describing the advantages of his road pavers.