[Clayart] Reinforced Sculpture

Maria Root via Clayart clayart at lists.clayartworld.com
Fri Oct 9 18:21:36 EDT 2015

Very interesting. I look forward to hearing more.

On Thursday, October 8, 2015, Paul Gerhold via Clayart <
clayart at lists.clayartworld.com> wrote:

> A couple of things I have learned.  One, the pieces are infinitely
> stronger than hollow clay alone and the time to mix and fill with concrete
> is minimal. By the way, if I didn't make it clear the concrete is add after
> the glaze  fire.  What I am building is seven foot sculptures for a hotel
> and I am of course worried about casual damage.  Deliberate destruction
> would be impossible to prevent but hollow samples tested can actually be
> hit with a hammer without busting the ceramic, although the glaze can chip.
> Lightweight concrete does not shrink on curing so that is not an issue and
> thermal expansion coefficients are quite similar.  Next test I will make a
> sample and repeatedly heat and cool in a kiln to see if problems develop.
> For the project I am working on freezing is not an issue but next batch of
> test samples I will try freezing/ thawing tests.
> The rebar is because the piece is going to have to be in sections and
> concrete does not have good shear strength.  Same reason rebar is used in
> concrete construction.  And there is no glue I am aware of that could even
> get close to the strength added by the combination of rebar and concrete.
> I do have a maquette that I made that is four foot tall and it has been
> outside for months through a lot of rain and heat but I am not sure that is
> really long enough to prove much which is why I asked if anyone has had
> experience in this area.  The pieces as well as a fountain need to be
> completed by January so if anyone has experience that would be really
> helpful.
> Paul
> Sent from my iPad
> > On Oct 8, 2015, at 12:13 PM, Taylor Hendrix <wirerabbit2 at gmail.com
> <javascript:;>> wrote:
> >
> > I do not have experience with this technique, Paul, but I'm curious as
> to why you are increasing the strength of your sculpture with low density
> concrete. I would think the trade off between increased cost/time to added
> strength wouldn't be worth it. What type of a sculpture is it and how much
> increase in strength are you seeing? How much added weight does the
> concrete impart and how much does it shrink as it matures? Why the rebar?
> >
> > I have always wondered if concrete-filled ceramics would be stronger
> than hollow formed ceramics. I am assuming these sculptures will be
> outside. Have you had any sculptures outside for any length of time?
> Differences in thermal expansion between the concrete and the clay might be
> an issue, and depending on local weather, freeze thaw might as well.
> >
> > This is interesting, Paul. Do you have any pictures?
> >
> > Taylor, in Rock Rock
> >
> > Taylor, in Rockport TX
> > wirerabbit1 on Skype (-0600 UTC)
> > http://wirerabbit.blogspot.com
> > http://wirerabbitpots.blogspot.com
> > http://www.flickr.com/photos/wirerabbit/
> > https://youtube.com/thewirerabbit
> >
> >> On Thu, Oct 8, 2015 at 8:18 AM, Paul Gerhold via Clayart <
> clayart at lists.clayartworld.com <javascript:;>> wrote:
> >> I am currently building some large hollow ceramic sculptures which will
> be internally reinforced with rebar and low density concrete.  Have done
> tests and smaller sculptures and this seems to work well and result in an
> incredibly strong sculpture.
> >>
> >> Am wondering if anyone else has tried this or has any experience using
> this technique on a large scale.
> >
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*Maria Root*
Primitiva Pottery and Tile

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