Smooth Rubbed Finish Concrete

Concrete that will not be exposed in the completed structure shall be any form finish as specified in section 03 11 00 concrete forming and aci 301 for rough form finish 2.

Smooth rubbed finish concrete.

The water and the rubbing action brings up a cement paste which makes concrete very smooth plaster like surface. Grind smooth any drips or bumps of concrete left on the wall. This will be used for cleaning off your tools. However stone rubbing has to be done soon after the forms are removed within a day or two at the latest while enough moisture is still in the concrete to create a paste that will fill the bug holes.

Trowel finish is the most common and popular finish of concrete used for major types of applications. Mix a slurry that is three parts portland. Cleveland concrete contractor ron simonetti says a smooth rubbed finish done with an abrasive stone should look the same as a grout cleaned sacked finish. So the operator can apply water and grind concrete simultaneously.

The wetted surface is rubbed with carborundum brick or other abrasive until uniform color and texture are achieved. Finishing process is conducted by slow speed grinding disc wheel at the same time applying water. Smooth rubbed no later than the day following formwork removal wet surface and rub it with an abrasive such as a carborundum brick until a uniform color and texture are produced. Fill one bucket halfway with water.

After the concrete is laid in the formwork and leveled the trowel is used to smooth and fine level the surface of concrete. Under aci 301 96 therefore the specifier who wants a smooth off the form finish untouched by rubbing on concrete exposed to public view will have to call this out as a special finish. A grout cleaned finish is similar to what many contractors call a sack rubbed finish. Wet rubbing is accomplished on green concrete by a slow speed grinding wheel or disc at the same time applying water.

The surface just before finishing. You want the surface to be as flat and clean as. No grout is used other than cement paste that is drawn from the concrete by the rubbing process. The water plus the rubbing action brings up a cement paste which results in a very smooth plaster like surface.

A smooth rubbed finish should be applied no later than the day after form removal. How to rub out new concrete walls step 1. In the earlier version of this specification aci 301 89 a smooth form finish did not require rubbing.