InfraStructures - December 2010/January 2011 - “Hot on Hot” Plus Conventional Paving With the Same Machinery

“Hot on Hot” Plus Conventional Paving With the Same Machinery

Contractor Kemna Bau Andreae GmbH & Co. KG used its new Vögele InLine Pave® train for the first time for pavement rehabilitation on the B 95 federal highway near Leipzig, Germany. The core element of the “hot on hot” paving method for asphalt roads is the SUPER 2100-2 IP paver for binder course equipped with the AB 600-2 Extending Screed in TP2 Plus version for extremely high precompaction.

The B 95 federal highway east of the town of Rötha close to the gates of Leipzig was in need of repair. Extending over a length of 4,7 km in all, the project was divided into four sections. Three of them were rehabilitated using the economical InLine Pave® technology from Vögele. On the fourth section, the roadworks were carried out in the conventional manner as the binder course was still intact.

Modular design crucial for versatile application and high utilization
The InLine Pave® Machine Technology offered by Vögele shows off its skills on just this kind of job site, where paving is performed both “hot on hot” and in the conventional manner. This is due to the fact that the paving train uses machines of standard design, with only the SUPER 2100-2 IP paver for binder course being slightly modified. With the SUPER 1800-2, applied by contractor Kemna for placing surface course in the InLine Pave® train, the MT 1000-1 Mobile Feeder and the SUPER 2100-2 IP for binder course, the company now has three Vögele machines that are perfectly matched to one another, but can nevertheless be used for other paving jobs at all times.

For contractor Kemna, modularity was a major point in favor of the Vögele InLine Pave® technology. “This significantly increases the utilization of the machines in our equipment pool and the profitability of the investment,” explained Michael Kaiser, manager of Kemna’s Leipzig branch, when justifying the purchase decision.

First InLine Pave® job with not a single interruption
One important factor for the success of “hot on hot” paving is smooth job site logistics. A reliable organization of the mix supply, for instance, is crucial and should be well planned and executed by an experienced team. And the team from Kemna fulfilled these requirements exceptionally well. The pave speed was matched to the rhythm of mix supply and, intentionally, was about 2 m/min. slower than usual. Nevertheless, the roadworks on the B 95 were completed in considerably less time than would have been possible using conventional paving, as binder and surface courses were both laid in a single pass.

The AB 600-2 Extending Screed in TP2 Plus version is a crucial element when paving two layers with the InLine Pave® train. Combined with SUPER 2100-2 IP for binder course, the screed represents the heart of the “hot on hot” paving technique.

It guarantees the extremely high precompaction of the binder course required for “hot on hot” paving, with values of over 98%. The AB 600-2 Extending Screed in TP2 Plus version achieves this high precompaction due to altered tamper stroke lengths, a special tamper geometry and, of course, the use of Vögele pulsed-flow hydraulics with two pressure bars for high compaction.

The high precompaction creates conditions that allow the paver placing surface course to travel on the freshly laid binder course. When built up with bolt-on extensions (for this job 2 x 1,25 m), the screed handles pave widths up to 8,5 m. On the job site near Leipzig, this enabled Kemna to pave in full-road width.

Source: Joseph Vögele AG
Wirtgen Group