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.

  • Fjdybank@lemmy.ca
    0·
    2 months ago

    Haven’t vibrated it enough. 100%. But it’s interesting because your void distribution is pretty consistent… im guessing you vibrated the mould rather than the mix.

    Your problem is not mix consistency, it’s entrained air. Mould vibration (esp with a small mould) is not good at removing entrained air.

    Try a needle vibrator on your next one. Maybe an old tooth brush?

    Edit: don’t forget to treat your forms. You want to apply specialised compound to reduce adhesion between concrete and form, so when you strip forms, pockets of uncured mix don’t ‘pull away’ from your piece.