How to Eliminate air pockets at surface??
How to Eliminate air pockets at surface??
(OP)
Am trying to pour an outdoor fireplace, grill and pizza oven. What shooting for a smooth clean surface, but after stripping forms was disapointed by the air pockets on the surface of all the vertical surfaces.
How to eliminate these. I've seen commercial work where the walls are uniform and smooth. What are we doing wrong?
Used a 6 sack mix with 3/8" rock and polyheat to help it flow better. Mix had a 4" slump. It was pumped into the forms. Forms were made from HDO form plywood. The mix was vibrated as it was filled, and we tapped on the forms as they were filled with hammers.
How to eliminate these. I've seen commercial work where the walls are uniform and smooth. What are we doing wrong?
Used a 6 sack mix with 3/8" rock and polyheat to help it flow better. Mix had a 4" slump. It was pumped into the forms. Forms were made from HDO form plywood. The mix was vibrated as it was filled, and we tapped on the forms as they were filled with hammers.





RE: How to Eliminate air pockets at surface??
Did you apply the vibrator to the body of the mix? or lightly to the concrete as it entered the form? 4" slump doesn't sound too bad, but may be a bit stiff for irregular forming. The 3/8 aggregate sounds about right. Entrained air makes the concrete mix a little more fluid. A superplasticiser may have helped by increasing the apparent slump to 8" or so.
Just some comments.
RE: How to Eliminate air pockets at surface??
my $0.02 (US)
RE: How to Eliminate air pockets at surface??