The municipality of Issigau, with a population of over 1000, is located on the eastern edge of the Franconian Nature Park in Germany. When, more than ten years ago, the green light for a subsidized rehabilitation measure was given, the responsible planners had to meet three objectives at the same time.
Changed visual perception
Project planners considered the crucial planning element for the new pavement concept to be the visual demarcation of various areas, achieved with different kinds of pavement. In accor-dance with this approach, most traffic lanes were again provided with asphalt pavement. For footpaths, intersection zones, T-junctions, and a number of totally traffic-calmed roads, however, the planners also decided on the use of special concrete pavers.
Damage prevention with a special pavement system
Apart from the visual appeal of the pavement and the issue of traffic calming, planners placed strict requirements on pavement loadbearing capacity for the weights imposed on the approx. 4,000 m² of paved surfaces. Reinhard Schnabel: “High shear forces act on the pavement, in particular at intersections. All these areas should be constructed such that the weights commonly applied by light trucks and waste collection vehicles cause no damage.“
The joint as prerequisite for a functioning surface
The planner sees the basis for this effect primarily in a special design of joint characteristics, which is system-inherent to the Einstein pavement. “For every paved area, it is of critical significance that the joint and/or the joint space can effectively bear traffic loads,” explains Schnabel. “This is requisite for achieving optimal transmission of shear and horizontal forces between the pavers. These forces generated by traffic are attenuated and uniformly transferred into the unbound granular material.”
Joachim Gronwald of Angermüller explains: “The transition elements at the paver flanks are responsible for these characteristics and are accordingly arranged in pairs in such a way as to prevent any shifting within the block configuration. One element of the transition-element pair always has cylindrical form, and the other tapers conically towards the top. This creates chambers that accommodate joint material in all aggregate sizes and enable maximum composite action. Because there are only very few contact points between the pavers, the entire surface also remains elastic over the long term.