There are many reasons why a concrete surface is sandblasted. Concrete can be sandblasting cumbria in order to texture it for better adhesion of a new layer of concrete or paint, to show the aggregate used in creating the concrete for decorative reasons, to etch a design onto the surface using a stencil, or just clean the surface removing ingrained dirt, paint or grease.
Make sure to cover the area surrounding the concrete surface with a tarp, taped into place. The abrasives used in the sandblasting can cause harm to secondary surfaces when bouncing off from the concrete so be sure to cover a wide range around you. Protective clothing must be worn, completely covering your skin and goggles to protect your eyes. Long-sleeved clothing, boots, work gloves, and a face mask are essential when sandblasting.
Directing the sandblaster nozzle towards the concrete, keep the end of the nozzle five to 10 cm from the surface of the concrete. Open the sand valve on the sandblaster, this will allow the sand to enter into the air stream when the nozzle is activated.
The surface of the concrete must be sprayed with short bursts of sand. As the sand hits the surface, move the nozzle of the sandblaster in short side to side motions, covering the area of the concrete that needs the blasting. The sand from the sandblaster will abrade the surface of the concrete, removing anything on the concrete’s surface. To etch a pattern using a stencil, apply the stencil and remove the pattern prior blasting the concrete surface so that the abrasive hits the concrete over the pattern only.
Continue abrading the surface of the concrete to wear down the surface and texture or delve into concrete itself. Continued blasting will get rid of the cement from the smooth concrete surface, revealing the materials used as aggregate for the concrete like small stones.