[papercreters] Sources of MgO (was; Re: just wondering)

Eo and others,

I don't have a lead for Tasmania, but in the USA, Martin Marietta is willing to sell dead burned MgO. They are primarily oriented to bulk users. I don't know what they do for small lots.

For phosphate, Southern States offers 4 pounds for $9, etc.:

http://www.southernstates.com/catalog/p-10031-bonide-triple-super-phosphate-0-45-0-4lb.aspx

http://www.southernstates.com/catalog/p-680-espoma-quick-solutions-triple-phosphate-5lb.aspx

http://www.southernstates.com/catalog/p-10318-espomatriplephosphate0-45-065lb.aspx

Bobby

--- In papercreters@yahoogroups.com, eo greensticks wrote:
>
> Hi,
>
> i have been using the ferrocement technique for sculpture and one of the
> reasons i was interested in MgO was the different electrical
> characteristics of the MgOPO4 concrete...
>
> the 'flaw' in ferrocement is that if you are using chickenwire with
> galvanized coating (zinc)
> i understand that there is an electrical interaction in between the zinc
> and the portland concrete which will eventually deteriorate the
> sculpture.Portland and copper don't get along either apparently.
>
> maybe the MgOPO4 over the chicken wire Might eliminate this problem, does
> anyone know?
>
> what i thought was to then use the papercrete as the *top* layer (the other
> way around to the suggestion)- it would absorb water of course
> (small test piece indicates that it absorbs an approximate third of its
> weight in water-hopefully not too much for the engineering of the frame?)
> but the water would then be released back into the atmosphere from that top
> layer - Would that work?
>
> I would *rather* use the MgOPO4 in the papercrete so that it was
> 'everything proof' ( all fibre encased in chemically bonded ceramic sounds
> great!) but
> i am still trying to find a source of the raw ingredients at an affordable
> price-
> it seems that the Granicrete is fairly expensive as well-i would be using
> it to test if i could get any
> but no australian supplier yet.
>
> i read Somewhere that even a small percentage of MgO in concrete mix for a
> slab means that a
> battery left overnight on the slab will not be discharged (i did not know a
> battery left on a concrete slab overnight Would be discharged but there you
> go)
>
> I have tried using MgO, the reactive kind with the cow on the bag, in the
> portland mix for ferrocement over galv chicken wire at 2 parts (by
> volume!) MgO to 1 part Portland and also the other was around (2 parts
> portland to 1 part MgO, by volume again) but hard to say what the
> difference is and i will not be here in 500 years to know if it failed! So
> far, after 2 years it seems fine...
>
> This would Not , of course, be the chemically bonded ceramic that seems to
> have become my 'holy grail' but i was going on the formula reccommended by
> TecEco to the sculptor in west australia who made the beautiful giant
> Ghekko sculpture (i think he also used flyash and
> clinoptilolite in his formula though which i did not)
>
> I am starting a new sculpture now, having just completed the chickenwire
> armature-having failed
> to find a source of the dead burned MgO i will use portland but thinking
> about coating the wire with something to isolate it from the portland-i may
> use reactive MgO in the portland mix for what it's worth but as i said, do
> not know if that will mitigate the 'electrical' deterioration of the
> material.
>
> Does anyone have any ideas about this?
>
> PS: at the risk of being longwinded (!) i attended a wooden Boat Festival
> yesterday where they
>
> were making boats with heat shrinkable dacron over cane or wood
> frames-very lightweight-
>
> brought me back to thinking about the patio roof i have been ruminating
>
> on for some time- my latest idea had been a lightweight sapling frame with
> rope or wire (or
>
> cane?) between the larger woods (which turned out to be exactly how they do
> the boats!)
>
> i would then 'skin' this frame (like the boats) with cloth stretched
> tight onto it and then paint
>
> with bondcrete -this would become the interior surface-and would provide a
> stiff enough
>
> support capable of holding the weight of a second layer of cloth dipped in
>
> slurry without any sagging , a design problem which has dogged my previous
> efforts at 'roof'
>
> (oh, for the MgOPO4-but i would use PC for availability just to get it
> done and keep the
>
> patio from being washed away by these crazy rains!)
>
> The idea is that i could work in courses from the edge to the top so that
> each completed
>
> section would hold my weight to continue the process (i would probably use
> removable supports
>
> to be on the safe side...) resulting , if it works, in a curving organic
> sort of roof shaped so as to
>
> shed the water to where i can collect it ..
>
> I go around about whether it should then be rendered over or perhaps a
> renderish layer
>
> of..papercrete? sawdustcrete? something...?* between* the cloth layers-
> maybe not necessary
>
> for strength but better for some insulation (my unlined tin roofs 'rain'
> inside from condensation on
>
> cold mornings, not good!)and then some kind of waterproofing safe for water
> collection over the
>
> top.
>
> Obviously the MgOPO4 is still the perfect but so far unobtainable solution
> to this design
>
> possibility but from what i have done so far and what i saw at the boat
> festival, i think it may
>
> work.
>
> there may be some 'tie down' issues to keep the thing
>
> on site (!) but it had me surmising that an upturned boat may have been
> 'the primordial roof'?
>
> cheers, eo
>
>
> On Sun, Feb 10, 2013 at 9:45 AM, seniorfinancialplanningins <
> devonia111@...> wrote:
>
> > **
> >
> >
> > *MgO i*s used as an insulator in industrial cables, as a basic refractory
> > material for crucibles and as a principal fireproofing ingredient in
> > construction materials.
> >
> > *From:* Garth & Kim Travis
> > *To:* papercreters@yahoogroups.com
> > *Sent:* Sunday, February 10, 2013 7:26 AM
> > *Subject:* Re: [papercreters] just wondering
> > **
> >
> > Greetings,
> > What is MgO?
> >
> > Bright Blessings,
> > Garth & Kim Travis
> > http://www.therosecoloredforest.com/
> >
> > Bedias, Texas
> >
> > On 2/9/2013 10:59 PM, devonias wrote:
> > > I was thinking of you using papercrete on a small chicken wire structure
> > > then covering it with MgO...can you shoot MgO from a heavy duty shop vac?
> > >
> > > _
> > ****
> >
> >
> >
>



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