Author Options:

Concrete with bubbles? Answered

Hello Mike, great tutorial. I am looking for a way to introduce bubbles into my casting. Like swiss cheese. Could not find a way till now. Found that air entraining agents only add invisible air bubbles. Any help will be much appreciated.

Thank you Tolga.

3 Replies

mikeasaurusBest Answer (author)2017-05-16

Interesting problem to create bubbles, where most applications look to eliminate them. I'm not sure of a way to get great results for this.

Air entraining is a start, but for larger bubbles you could try a slightly wetter mix and whip the concrete while mixing. No idea if that would work, just a thought. There might be a chemical solution you could add to react with the concrete and create voids.

Another thought would be to add large styrofoam balls to the concrete to make a cavity. After curing you might be able to remove them, either through breaking part of the concrete and picking them out, or locating them and dissolving them with a solvent.

This would require some experimentation. I'd love to know your results to this facinating and unique idea!

Select as Best AnswerUndo Best Answer

Gribnif (author)mikeasaurus2017-05-16

I believe foam will degrade with certain chemicals, I tried to use spray paint on some Halloween "gravestones" once, and they melted/pitted nicely, but I was going to suggest heat to burn them out. The only problem I see is the staining on the concrete, and you would have to have PPE -- the fumes are not good.

Select as Best AnswerUndo Best Answer

ecrono (author)Gribnif2017-05-16

Thank you mike and gribnif. First of all styrofoam is a great idea to try. I nannot wait to try. Surely share my results. Gribnif styrofoam actually degrades with acetone - so the youtube says . I could not accomplish such succes yet. I begin to suspect that either styrofoams are way powerfull or acetones are too weak in my country.

Thanks again for the enlighting insights. Have a wonderful day.

Select as Best AnswerUndo Best Answer