Approaches, exits and an underpass in asphalt
Johannes Foos, construction foreman for the customer (Karlsruhe Regional Administrative Authority), has a very definite opinion on the use of concrete and asphalt: “Concrete is the right building material for this heavily trafficked highway, and the most sustainable. However, most of the approaches and exits handle significantly less traffic, so stone mastic asphalt is the material of choice for them. It bears enough of a load that it doesn’t get brittle, but the load is not so high that it causes wheel ruts.”
Therefore, in addition to total rehabilitation of the concrete roadway, the approaches and exits were also renewed as required by their degree of wear. Bickhardt Bau renewed the asphalt surface and binder courses, a total of some 12,000 m². The team further paved a 100 m-long section in the region of a bridge with asphalt. The 14-cm base course (AC 32 TS) and 8-cm binder course (AC 16 BS) were paved in one day across a width of 10.30 m. These jobs were taken care of by a Vögele SUPER 1900-2 paver and a Hamm DV 85 VO tandem roller. After they finished their work, the road was surfaced with a mastic asphalt course.
High compaction meets the highest demands
The SUPER 1900-2 was equipped with an AB 600 TP2 extending screed for its work on the job site near Karlsruhe. Michael Fuchs, foreman of the blacktop crew, likes the screed because “extending screeds from Vögele are more stable and display greater torsional resistance than other solutions.” The reason is the highly stable single-tube telescoping system, which helps to quickly and precisely set the correct paving width. Michael Fuchs maintains further that Vögele pavers simply “produce a better pavement surface,” because the screed plates, tamper bars and pressure bars are heated particularly uniformly.
But the SUPER 1900-2 has even more features for consistently delivering maximum quality, such as during material feed. Large, oscillating push-rollers ensure a smooth supply from the feed truck – a key prerequisite for maximum surface evenness.
For leveling, Bickhardt Bau uses the NIVELTRONIC Plus System for Automated Grade and Slope Control, combined with the associated sensors from Vögele’s extensive line. As a result, there was no stringline along the short stretch between the concrete roadways. The adjacent slot channel on the first lane was used instead as a reference, being scanned by sonic sensors. NIVELTRONIC Plus together with a slope sensor took care of the rest.
Vögele SUPER 1900-2: Most user-friendly paver
Paver operator Pascal Reichmann has been working with the SUPER 1900-2 for five years already, and he is still thrilled with his machine. For him it is “the most user-friendly paver on the market,” in part because of its well-designed details, the arrangement of the controls, the easily repositionable operating console, the swing-out seats and the extending sunshades.
Certified paver driver
Reichmann also is the proud owner of a “paver driver’s license” or more precisely: He is a “Certified Paver Operator.” Various providers offer specialized training classes at which paver operators can earn this certificate. Reichmann spent a week at Vögele in Ludwigshafen, Germany, for this purpose: “We learned a great deal about the machines, safety, logistics and asphalt as a building material. I can apply what I learned there on the job every day.”