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First time trying concrete mold. Too much water or too little vibration? (feddit.dk)
submitted 1 year ago* by to c/diy@beehaw.org
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All recommendations are welcome. In particular how to vibrate a two part mold without it breaking apart. I did not weigh the mix and water, but i suspect i used too much water. Also added about 2% plasticizer.

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[–] [S] 4 points 1 year ago (1 child)

Thank you for the advice. Do you really think a toothbrush will work? ^^ I read somewhere that oil spray (you know for pans and stuff) was good, so i tried that and it seemed to work fine, the form slipped pretty easily.

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  • [–] 9 points 1 year ago (1 child)

    Pam or similar should be fine as a mould release. A YouTuber we watch, Evan and Katelyn, did an experiment testing different vibration methods for concrete, and they found a personal vibrator (yes, that) was the best for smaller projects like this.

    https://m.youtube.com/watch?v=OOFOxDiOgEA&pp=ygUZRXZhbiBhbmQgS2F0ZWx5biBjb25jcmV0ZQ%3D%3D

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  • [–] 4 points 1 year ago*

    Both good options. Don't need to be fancy, so long as it works.

    Re the vibrator recommendation - that's hilarious but apt. You want something that doesn't move a lot, but oscillates a ton. A vibrator fits those requirements. A mechanical toothbrush could work in a pinch, but you don't want the rotating toothbrush head, it's the motor vibrations (offset? Can't remember) doing the trick.

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