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Save to reading list Published by Emily Thomas, Editor Assistant of World Cement, September 17, 2021, Friday at 08:55
When Dingolfing renovated the circulation system, the responsible district office decided to use concrete roads. For the first time, the climate-friendly pavement cement CEM II / A-LL 42.5 N with a lower clinker ratio from Heidelberg Cement was successfully used. This meets all the requirements of ZTV Beton and can be used without restriction in concrete road construction.
Roundabouts can significantly increase traffic safety and improve traffic flow. Not far from the exit of the A92 Dingolfing West highway, a roundabout opened up the adjacent industrial area and formed the entrance to the BMW Group's Dingolfing factory. Downstream distributors are burdened by heavy traffic. In the current plan, the highest load class BK 100 is being tendered for further development. The old tar roundabout has been repaired several times. "All asphalt layers have deformations and cracks," said Manuel Stenzell, who is in charge of the civil engineering department of the regional office in Dingolfing-Landau. "The increase in maintenance costs and the large number of heavy vehicles made us make a decision to build a concrete roundabout." Good experience with other specific gyroscopes encourages customers to make this decision. In the past 10 years, more than 160 concrete roundabouts have been built nationwide with high quality. These experiences have flowed into the planning.
Roundabouts are used more frequently than other transportation routes. Driving in a small radius and braking and accelerating processes can generate shear stress on the road. This huge stress from the axle load and thrust of the truck can be absorbed particularly well by the thick concrete slab. This kind of construction requires careful planning. This was transferred to Landau an der Isar, an OBW engineering company. Additional fiber-reinforced materials and steel inserts when necessary can improve the safety against deformation and cracking. According to the expected stress and specifications in the "Guidelines for Standardization of Superstructures in Traffic Areas", RStO, the entrusted engineer designed the road structure and plate thickness.
The new concrete pavement is installed on an asphalt base with a thickness of 30 cm and is segmented by dowels and transverse joints. The layout of the expansion joints comes from planning. In principle, the shape and size of the concrete slabs used for roundabouts may require reinforcement of the concrete. At the Dingolfing roundabout, the adjacent entrance and exit areas are reinforced with welded mesh. A specially developed slipform paver can be used to pave concrete at roundabouts. Or, Dingolfing's construction workers "hand" installed about 550 cubic meters of concrete, using so-called "vibrating plates" between the formwork. This work was carried out by Berger Bau Passau on behalf of STRABAG AG.
After the work is completed, the roundabout will be rendered in a particularly light shade. The coloring suitable for roads is also due to the use of special pavement cement. For the construction project of Dingolfing, the Burglengenfeld plant of Heidelberg Cement AG independently developed the pavement cement CEM II/A-LL 42.5 N, which meets the requirements of ZTV Beton and can be used without restrictions in the construction of concrete pavements. In this project, this cement was tested for the first time, and finally received very positive reviews from customers and construction companies. The concrete using the selected Portland limestone cement is easy to use and achieves a particularly good surface seal. Its particularly dense concrete ceiling has great advantages in terms of the required durability. Due to the low alkali content, the cement used ensures that alkali-silica reaction does not occur-that is, concrete damage. Compared with traditional pavement cement based on Portland cement, Portland limestone cement CEM II / A-LL42.5N has a lower clinker ratio, so it is more climate friendly. In the production of CEM II cement, relatively little carbon dioxide is released. Therefore, this cement supports the cement industry's sustainable efforts to reduce carbon dioxide emissions in the next few years. Overall, everyone involved benefits from this newly developed building material: builders and users benefit from a permanent and safe transportation system, and construction companies benefit from the good processing properties of the building material concrete. Last but not least, the special pavement cement makes a significant contribution to climate protection.
Read the article online: https://www.worldcement.com/europe-cis/17092021/heidelbergcement-renovates-roundabout-in-dingolfing-with-a-new-concrete-lane/
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