By adjusting the concrete mix design—and thereby accelerating the initial curing process—the road closure could be lifted about three weeks earlier than originally planned. 

At heavily trafficked bus stops, such as platforms B, C, and D at the main train station, conventional asphalt pavements reach their limits. High temperatures, along with buses constantly braking and accelerating, lead to ruts, deformations, and corrugations. The city of Wiesbaden has therefore deliberately opted for the highest-quality and most durable construction method: concrete.

“This superior construction method ensures a longer service life and thus benefits residents. Under these conditions, a concrete road lasts 25 to 30 years without major repairs, remains stable even in hot weather, and results in lower long-term costs,” explains Marc Dahlen, Head of the Transportation Department.

Concrete roads consist of a mixture of cement, sand, gravel, and water. The cement acts as a binder that holds everything together. The so-called superstructure is a concrete road surface. This rests on a base course of crushed stone. Base courses transfer the load to the subgrade and serve as frost protection. 

After installation, the concrete usually needs to cure for several weeks to reach its full load-bearing capacity and strength. Only then can the road be opened to traffic. No visible construction work takes place during the curing phase. Nevertheless, the four-week waiting period is a necessary investment in the road’s longevity: if (heavy) vehicles were to use the road sooner, they could cause permanent damage to the pavement, which has not yet fully cured. 

The city of Wiesbaden thanks all road users for their patience during the curing phase.

Depending on the level of traffic, the state capital uses different types of road surfacing. Here is an overview of the three most important options:

•  Concrete is the most expensive but also the most stable option. It is light in color, reflects light, and heats up less. It is also dimensionally stable and extremely durable. Disadvantages include high initial costs, a long curing time, and more complex repairs.
• Semi-rigid pavement combines the seamless nature of asphalt with the compressive strength of concrete. It is ready for use quickly (after two to three days), can withstand heavy loads, and is more heat-resistant than pure asphalt. However, the installation process is very demanding, and repairs require specialized equipment. 
•  Asphalt is inexpensive, quick to lay, and easy to repair. It provides a comfortable, quiet ride. However, in extreme heat, it can soften, deform, and develop ruts. Moisture can also penetrate the surface and lead to potholes. This surface requires more frequent maintenance.