Filling Surface Voids In Concrete Walls

Aci 301 05 specifies two as cast surface finishes.

Filling surface voids in concrete walls. Water voids occur in the concrete surface when drops of water become entrapped between the concrete and the form during vibration. The permissible number and size of bug holes in a concrete surface is not defined in either aci 301 05 or aci 301 10 specifications for structural concrete in fact aci 301 05 does not limit either the number or size of surface voids in as cast surface finishes. Careful preparation and methodical practices can eliminate even the worst of surface voids. Water similar to release agents water is also trapped against the mold s working surface resulting in voids.

While repairing voids or honeycomb in concrete surface the most common question that arises is what should be the thickness of the. However problems do arise if the concrete surface is to be painted or if the voids reach a larger diameter typically greater than 1 inch. Causes perhaps the most influential cause of bugholes is improper vibration. Tip 6 use the correct release agent for the removal of the concrete from the moulds.

Sometimes filling a form too fast can also cause the concrete to segregate which can cause more surface voids. I ve never used it but i imagine applying it with a trowel would be the ticket. How to eliminate voids in a concrete casting. After hearing that i seriously considered just gluing a piece of plywood over it and calling it a day.

The guys at home depot had a lot of fun lamenting the fact that the hole existed to begin with and then suggested that i build a mold on one side of the wall and fill it in with a pour of concrete. As the soil settles or is carried away by other means a gap opens up between the soil and the bottom of the concrete slab resulting in a loss of support. Go to your favorite home store and get a sack of stuff called parge it s used to fill in rock pockets on formed concrete placements such as walls. But there s nothing typical about the recommended approaches to repairing these voids.

Next time as was mentioned pour it wetter and smack the forms with a hammer. The water later evaporates to leave voids. These surface voids are primarily an aesthetic problem for exposed structural concrete. Honeycomb repair in concrete surface honeycomb and larger surface voids require procedures resembling those for typical concrete repairs.

While many variables must be considered in the elimination of surface voids or bug holes in concrete castings there are a number of precautions that can remedy this unsightly problem.