Concrete ages - this is not new. Due to weathering or road salt, concrete corrosion begins, carbonation of the outer concrete layers follow, leading to a reduction in alkalinity and thus to corrosion of the steel reinforcements. The smaller the cover, the quicker the concrete needs to be rehabilitated. However, this is not the only problematic aging phenomenon. There is also the alkali aggregate reaction (AAR), which starts deep in the structure of the concrete. The phenomenon is quickly described - and once again a problem of moisture. Depending on the water exposure, it penetrates the concrete at different rates, where it forms alkalis with the alkaline constituents of the cement. These in turn react with the silicate aggregates sand, gravel, quartz, feldspar. The result is the aforementioned alkali-calcium-silicate hydrate, which is capable of storing further water. This in turn results in an increase in volume of the concrete structure, which becomes visible as cracks. Our mission is to remove the damaged areas and stop the concrete corrosion. This is done by applying new reinforcement protection and concrete re-profiling using repair mortar or concrete. This can be done by spraying or conventionally (pre-concreting with vibration). At the end, a surface protection is applied.