Rain damaged concrete.
We get numerous calls about rain damaged concrete. Builders often get caught out by weather conditions and this has serious implications on the surface finish and suface strength of the concrete slab. Rain damage can cause the top 2 to 5mm of the concrete slab to become relatively soft and weak, in extreme cases it could be much deeper. The surface of the concrete will also dust very easily which adds to the issues.
One major problem with the top of the concrete being weak is delamination. With hard flooring like tiles and timber being bonded to the surface in a short period of time the surface of the concrete can start to break up especially when underfloor heating is applied.
Some companies use high pressure water at 3500 psi to try and remove the weak surface but the best way is to grind it. Our Werk Master and HTC machines are ideal for grinding the surface away to leave the concrete slab with a smooth strong concrete surface which could then be taken on to polished concrete or epoxy/paint coatings. The best thing is to not leave the issue to chance and deal with the problem as soon as possible. The concrete can be ground normally after 7 days, leave it to long and it can become much harder to deal with.