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    Acrylic Brick Molds

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    • U
      upwinger Major Contributor last edited by

      I decided to attach the corners on one side with pop rivets, and use self tapping screws on the break apart side of the corners.
      They easily come out with a cordless drill.
      I'm going to use a piece of scrap aluminum plate for the bottom, and use the same self drilling screws to easily remove the bottom.
      This will test how well or not aluminum separates from the set-up aircrete block.
      I pre-drilled the holes through the plastic to prevent cracks.

      inside corner.jpg
      mold bott.jpg
      mold bott2.jpg

      K 1 Reply Last reply Reply Quote 1
      • K
        KnowItAllTeen Major Contributor @upwinger last edited by

        @upwinger The plastic forms could work. If it's slippery, you would not need any hinges. You would just slide it out. No problem. Let me know how it goes.

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        • U
          upwinger Major Contributor @KnowItAllTeen last edited by

          @KnowItAllTeen Thats what Im hoping for, but not sure . we'll see soon.
          Im going to go tomorrow and try to find some portland cement, sticky stucco ( or scratch coat) mix
          and clothe. And Cat food 😉

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          • U
            upwinger Major Contributor last edited by

            UPDATE
            Total fail...
            The aircrete stuck to the plastic and leaked out at the bottom.
            I will try again after removing the plastic film from the acrylic, and try running a bead of silicone glue
            at the bottom of the mold.
            The brick wont slide out, so the mold needs to be rebuildable. The mold broke apart no problem, but the aircrete that stuck to the mold
            caused the brick to break apart at the bottom.
            Hope the next attempt goes better... I just have to wait for the rain to stop for a few days.

            Zander 1 Reply Last reply Reply Quote 0
            • Zander
              Zander Dragon Tamer Workshop Graduate Forum Administrator @upwinger last edited by Zander

              @upwinger What if you were to line the mold with a thin slippery plastic liner? In theory it would prevent leakage and release from the mold. Then you could peel the liner off of the aircrete.

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              • U
                upwinger Major Contributor @Zander last edited by

                @Zander I was thinking " what if I sprayed the inside with Pam cooking spray"
                LOL

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                • K
                  KnowItAllTeen Major Contributor @upwinger last edited by

                  @upwinger Oil it up just like a brownie pan!😅

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                  • U
                    upwinger Major Contributor last edited by

                    I am going to try this weekend again after adding an acrylic bottom piece and plastic wrapped the inside of the mold
                    for "Take 2" !!
                    plasticwrapped.jpg

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                    • U
                      upwinger Major Contributor last edited by upwinger

                      I had only one small blow out leak at one corner...
                      Next block I will assemble the mold with a bead of silicone under the plastic wrap so the sides will squeeze a seal when I screw it down.
                      The plastic wrap works great for the block release, except it's hard preventing the wrinkles. I haven't tried removing the block from the mold yet, but I used the plastic wrap on one of the mushrooms and it slid right out of the bowl.
                      block leak.jpg

                      I'm planning on using these test blocks to make some miniature Rapa Nui' Moari heads:

                      Rapa Nui Moari.jpg

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                      • U
                        upwinger Major Contributor last edited by

                        The block weighs in at exactly 20 lbs on my bathroom scale:
                        blockwt.jpg

                        Does that sound about right for aircrete density?

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