The honeycomb structure of the Porous tarmac is made up of porphyry gravel coated with a cold-poured hydrocarbon binding. It is poured without a joint, which is the best proof of the flexibility of the material, allowing it to be laid without any danger of cracking on some kinds of ballast or stabilised ground.
Once the drained foundation has been laid the technique used consists of manually pouring the surface with a double slope of 5mm/m on either side of a longitudinal line to ensure the best possible draining of rainwater in the unlikely case of the court’s porosity becoming blocked.
The porous asphalt playing surface with a granulate from 2 to 4 millimeters has been carefully studied depending on the material parameters, the porosity of the coating, the wear of the balls and the comfort of the game.
To avoid the disintegration of the gravel on the surface over time a protective layer (neutral acrylic styrene) is applied before the surface colour is added by the projection of acrylic copolymer mono components treated for fungicide and bactericide, specially designed to enable players to return to the court soon after rain.
If, after many years, Porous concrete shows a certain wear, the Siméon technicians will revamp the coating with a fine layer of the same material. They may recolour it or carry out a recoating. These operations are generally cheap and easy to do after the permeability of the court has been checked and the spreading of a stick emulsion.