Architectural Rubbed Concrete Finish

Part 3 execution 3 01 repair of surface defects.

Architectural rubbed concrete finish.

The end result is a panel with coarse aggregate exposed to the degree called for by the design. The exterior skin designed as a rainscreen facade consists of 25 000 square feet of architectural precast tracery and ornamental panels gracefully integrated with brick masonry. Rub out new concrete walls for added protection. It s like paying for a hamburger and wanting the cheese for free.

When the bids hit they always accept the class c but hold the concrete contractor to the class a guidelines. A popular easy to apply and long lasting finish is called rubbing. Immediately after concrete has been placed in forms concrete finishers utilize a screed to level out the concrete surface. Provides a uniform texture and architectural finish.

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. After you have formed and poured your new concrete walls you will need to apply a finish to the surface to help seal it and to make it more visually appealing. Precast architectural concrete section 03 45 00. Concrete finish covers color and texture variations in poured concrete with a uniform finish eliminating the need for costly rubbing.

The most basic type of concrete finish is a smooth surface created through the use of screeds and trowels. Architectural concrete finishes can cost up to three times more than a class c finish. Definition this finish is achieved by casting against a form surface that has been painted with retarder which retards the set of the concrete at its surface. 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.

After the panel is removed from the form the retarder is removed by sandblasting. The new aci 301 10 specifications for structural concrete lays out the requirements for surface finish 1 0 2 0 and 3 0 and unspecified as cast finishes. I recommend the following when placing architectural concrete. Where concrete surfaces will receive architectural finishes such as resilient floor coverings or paint or membrane waterproofing membrane forming curing compound shall not leave a coating or residue that will impair bond of adhesives paints and coatings with concrete.