Road rehabilitation with concrete from sibo (a Dyckerhoff subsidiary)

The sibo concrete plant in Ankum supplied colored concrete for an intersection in Bramsche, district of Ueffeln.

While the proportion of concrete road pavements on motorways is now around 30%, it is still very low in municipal road construction. Due to the increasing load on urban traffic areas as a result of increasing traffic density and the expansion of heavy goods traffic, concrete pavements are also proving to be very effective in urban areas - especially where asphalt pavements hit their performance limits. These include bus lanes, bus stations, roundabouts and intersections. Concrete carriageways have a number of advantages: They are non-slip, noise-reducing, resistant to deformation, highly resistant to heavy loads and hardly require any structural maintenance measures. In addition, the normal service life of a concrete pavement is 30 years or longer (according to the Gütegemeinschaft Verkehrsflächen aus Beton e.V.). Asphalt pavements often have to be renewed after half of this time.

In autumn 2018, the carriageway of the B 218 at the intersection in Ueffeln was renewed. This is an intersection with heavy traffic, including heavy goods vehicles. On the existing asphalt road surface, ruts, deformations and waves repeatedly occurred at high temperatures. Therefore, the owne, the district of Osnabrück, decided for a concrete pavement, that was installed by Bestra Beton-und Straßenbau GmbH, Coppenbrügge.

The Ankum plant of sibobeton Osnabrück GmbH & Co. KG supplied 230 cbm of anthracite coloured concrete of strength class C30/37 with medium strength development to the construction site approx. 11 kilometres away, in September and October 2018.

Since the concrete not only has to withstand considerable weight and rainwater, but also aggressive media such as de-icing salts and alkali salts, it was decided to use LP concrete based on Dyckerhoff PZ Doppel road surface cement of quality CEM I 42.5 N (sd) from the Dyckerhoff cement plant in Lengerich. The addition of air-entraining agents creates tiny air spaces in this concrete that make it more durable and increase its resistance to freeze-thaw and freeze-thaw with de-icing salt.

In order to harmonize the connection from the adjoining asphalt roadway to the concrete roadway, the road surface concrete used was dyed anthracite, with black liquid paint from Ha-Be Betonchemie GmbH & Co. KG, Hameln. The uniform colouring of the concrete was achieved by using a dosing system. Thus, 22 kg of liquid paint per cubic metre of concrete were added to each mixer truck at the plant.

For further rehabilitation measures on the B 218 such as kerbstones and the roadway in the area of a roundabout and several bus stops, sibobeton supplied about 700 cbm of standard concrete of strength class C30/37. Technical support at the plant and on the construction site was provided by GfBB Prüftechnik, Lengerich.