Fast track paving

Fast Track Paving

Re-paving Fiat’s famous test track in Balocco, Italy, required speed, accuracy and precision – not to mention a unique method especially designed by Volvo Construction Equipment Italia, which could revolutionize the road paving industry.

The Balocco track was built in the 1960s by Alfa Romeo before it was acquired by the Fiat Group. Each year about 20,000 vehicles including new cars, prototypes and racing cars, are put through their paces on the course’s test tracks.

One circuit has recently been re-paved – the 7.8km (4.8 mile) high speed track, with three driving lanes, each 4m wide, plus an emergency lane which is 2.5m (8ft) wide. This is a torturous road course of 65km (39 miles), modelled on some of the world’s most famous racing tracks. The slope of the track’s curves range from 2% to 27% and speeds can reach up to 280kph (174mph).

A Unique Solution
Mauro Martelli, head of the new Road Machinery Division of Volvo Construction Equipment, and Mauro Arletti of Arletti Pavimentazioni Stradali were responsible for the project. The delicate application of layers of bituminous mixture – binder and wear – on both the straight sections of track and a series of curves. Their innovative solution was to develop a unique spreading method using a customized screed able to perfectly fit the shape of the circuit surface.

 “The possibility of performing a spreading operation on a perfectly concave base without interruption and to vary the settings according to the surface profile is a new process. The market has made solutions available for the so-called cambered road spreading in various alternatives, but no solution of this kind,” says Mauro Martelli.

The new paving – separated from the base by a SAMI waterproof membrane, made using modified bitumen emulsion – consists of a binder and a wear course. This was made using a special, high performance bitumen for racing circuits provided by Valli Zabban and CoBit.

In order to make the joints invisible, two Volvo ABG 8820 tracked pavers with modified screed worked in parallel and were supported by a wheeled paver, the Volvo ABG 6870, to lay the mixture. The screed, fitted to the two pavers, was produced according to specifications provided by Arletti and Volvo Construction Equipment Italia. “The main technical problem we had to solve was to shape the convex curves of the race track when the path straightens,” says Martelli. “Because of the peculiar characteristics of this circuit, we had to repeat this operation six times with three different modalities and two different radii at the entrance and at the exit of the curve.”

Fast track paving

The Team
Behind the Balocco project are two of the industry’s most capable performers. Arletti Pavimentazioni Stradali has been active for more than half a century. Its clients make up the majority of the Italian racing circuit’s most glamorous players. “Among our customers are Pirelli, Ferrari, Ducati, Maserati and Lamborghini. It is a niche market, which requires highly specialized techniques and extremely high quality,” says Arletti.Fast track paving

The Machines
Pavers from Volvo’s ABG range were used to lay the screed. The range offers variable power tracked pavers with a paving width of 2.5m (8ft) to 13m (43ft), three axle wheeled pavers with a paving width between 2.5m (8ft) and 9m (30ft), as well as single drum and tandem compactors. All Volvo ABG pavers are equipped with the latest emission compliant engines, as well as innovative hydraulic, that allow them to work at a reduced engine power. “This means remarkably quiet operation combined with consumption savings,” says Martelli.


September, 2010

Note to Editors: This story is published in issue 33 of Spirit magazine, Volvo Construction Equipment’s external company magazine.

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