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concrete mold keeps cracking, why?

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marker
Posted: Sat Aug 20, 2011 10:01 am Reply with quote
Joined: 10 Jul 2005 Posts: 162
how thick is the mold? mine are probably about 8 inches at the bends for the nose and tail and haven't had any trouble after four years and at least 200 presses.
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lovetoskate
Posted: Sat Aug 20, 2011 2:06 pm Reply with quote
Joined: 18 Dec 2009 Posts: 38
if you put the top and bottom pieces together its 10.5" wide
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Clownbaby
Posted: Sat Aug 20, 2011 4:16 pm Reply with quote
ORDER OF THE SKULL ORDER OF THE SKULL
Joined: 27 Oct 2009 Posts: 6252 Location: Utah
you've looked at the stuff online?

http://www.diyskate.com/mold_01.html

let's see pictures
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marker
Posted: Tue Aug 23, 2011 10:00 am Reply with quote
Joined: 10 Jul 2005 Posts: 162
are you putting rebar in too? 10.5 seems plenty thick. mine have small airpockects on the surfaces, I use 1/8 mdf as a clampling cual. yea pictures might help determine what is causing them to crack
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rightfootforward
Posted: Thu Aug 25, 2011 2:49 am Reply with quote
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Joined: 03 May 2006 Posts: 7642
Concrete on its own is very brittle.

Even with fiber reinforcement you might need some re-bar in there too.

Just a few pieces should do the trick.
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