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.

  • wiegell@feddit.dkOP
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    5 days ago

    I guess it’s because i vibrate the mold and not the mix directly as others have suggested

    • jay2@beehaw.org
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      19 hours ago

      Just inadequate vibration. Really take your time with it. What’s your set time?