Built on sloped land opposite a road intersection, the parking lot of a new shopping mall in Thessaloniki had one imperative: guaranteeing the safety of pedestrians and motorists by avoiding standing water in heavy rain, which falls quite often in the region.
The original idea of installing a drainage system was soon discarded because of high cost. And that's where we stepped in, as our team at LafargeHolcim suggested the use of Hydromedia™, LafargeHolcim's new-generation pervious concrete.
The principle of the system? A 15 cm slab of black-colored Hydromedia™ is laid on top of 25 cm of coarse aggregates (30 mm diameter), to ensure both permeability and the endurance needed to bear the weight of 8-tonne delivery trucks. Working as a filter, the aggregates retain sediments and solid particles and limit concentrations of pollutants in the stormwater. Hydromedia™ also contributes to better management of water resources in the urban environment!
It only took four days to pave the 450 m² of the parking lot. When the first heavy rain came, it demonstrated the effectiveness of the solution: no runoff and no puddles. The inhabitants of Thessaloniki can get on with their shopping!