On 28 November 2022, the Osnabrück branch of Oevermann Verkehrswegebau GmbH began preparatory work on the rehabilitation of Bokeler Straße (district road 142) in Bersenbrück. The focus here was on a sustainable and economical method: Approximately two kilometres of open-pored concrete were produced - a building material technology that scores points from an ecological and economic perspective. The contract awarded by the district of Osnabrück included not only the production of the concrete but also the removal and disposal of the existing roadbed. In addition, a 16 cm thick base course of crushed stone was constructed under the concrete during a full closure. This was followed by the filling and preparation of the necessary working spaces.
Technical challenges.
This project was the first time that Oevermann had used concrete ballast. The district of Osnabrück had already implemented this design in the past on the same road K142 in the other direction of travel and found it to be good. Compared to other, regulated roadbed designs, such as roadbed gravel, consolidation or grass pavers, roadbed concrete is an ecological and economical alternative in road construction.
The economic benefit: Compared to other methods in road construction, banquet concrete has a reliable infiltration capacity at the same time due to the high void contents with a high load-bearing capacity, which is also suitable for temporary heavy traffic loads. Sealing of the verges can be ruled out due to the high water permeability. This increases the service life of the road. In addition, the technology goes hand in hand with low maintenance and servicing requirements, as the design is jointless. Together with the effective protection of the road edges against edge chipping, it thus saves on repair and maintenance costs.
The ecological advantage: the open-pored concrete binds fine dust and pollutants from road traffic and thus serves as a filter for pollutants. The process thus has a lasting positive effect on the environment and improves the CO2 balance. It also conserves resources, as the building material is recyclable.
The paving thickness and building material properties can be individually adapted to the traffic load and the conditions on site. Due to the fact that the client planned to carry out the work in November/December, the weather made the work more difficult. It was also necessary to modify the mould of the slipform paver and to retool the technology for scanning. Despite the challenges, the task was completed safely and successfully thanks to a high level of professional competence.
Implementation in record time
The concrete paving took place from 05 to 09 December 2022 and the final work was completed by 13 December. Only the traffic safety measures remained in place until 22 December so that the concrete could harden sufficiently before the traffic flowed again without any problems, even under high loads from, for example, heavy traffic such as buses,
Construction materials expertise and safe execution from a single source
Thanks to the intensive cooperation with the in-house construction materials laboratory during construction, which also took over on-site monitoring, the construction site team handed over the project to the satisfied client with high quality and free of defects.
