Ceresit CD 30 adheres to crack-free, load bearing, clean concrete substrates, free from any substance, which may impair adhesion. The substrate should have sufficient compressive strength (concrete class above C12/15) and pull-off strength of minimum 1,0 MPa. Concrete Corroded and carbonated concrete and any loose elements should be carefully removed. Any stains, the layer of cement wash, anti-adhesion agents, old layers should be mechanically removed. The surface of the concrete should be rough and porous, ensuring good adhesion. The substrate should be mechanically prepared e. g. through abrasive blasting, grounding or milling. Before the application of mortar CD 30 the concrete mortar should be sprayed with water without any puddles formed. The substrate should be damp; however, there should be no water pools. Reinforcement The corroded reinforcing bars should have the concrete support removed up to the places which are not corroded The reinforcing bars should have rust removed by sand – blasting to the degree of cleanliness of Sa 2,5 so that they acquire clear, metallic appearance and then they should be cleaned with compressed oil free air. During the application of mortar CD 30 the steel may be damp. The anticorrosion mortar CD 30 should be applied no longer than 3 hours since the time of cleaning the reinforced bars.