Hi,
you would need to do some small tests to decide about the sand- Michael Collins says 'no sand' when he uses the MagPO4
concrete as a slurry on cloth-he throws sand on afterwards (that's on the green home building site) but possibly that is only
because the sand sinks to the bottom of the bucket and doesn't 'paint' on well when used as slurry?
when i use portland slurry on cloth i leave
the sand out for that reason but in papercrete it seems to me that the sand adds some...gumption (?) to the mix...
.
as i said, i have yet to get ahold of the proprietary MagPO4 concrete (except for horrible Rapidset 60 which is' the' stuff but it has
strong ammonia smell, honking great pebbles in, an ugly dark grey colour and is expensve to boot-plus i suspect it contains flyash
which is full of heavy metals) So now i am attempting to source the raw ingredients-
but Granicrete is a proprietary MagPO4 cement and it is
marketed in the USA so i should think you could find it where you are?
the Mono Pottassium Phosphate (0-52-34) is easy to source as it is a commonly used fertilizer
- the fine ground dead burned MgO is the hard part-it is a refractory material used to line furnaces in the steel industry apparently
but it seems they don't use it much- where i live, not at all and No one has ever heard of it. Sibelco makes it but one ton minimum
order was the regular go- one of theri companies offered to put together 2 20k buckets fro me but it will cost $250 plus 10%GST And
freight which is more than the MgO.
So i am still trying to scheme up a way of getting the stuff.
I was in Florida recently- how i wish i had realized and i would have brought a bag home as excess baggage!
cheers, eo
On Mon, Feb 4, 2013 at 6:22 PM, babalubird
<losee04@sprintpcs.com> wrote:
Thanks, greensticks, but I was thinking the ceramicrete or magnesium-based cement would be substituted complete for the portland. That is, no portland in the mix at all, but only the ceramicrete.
From what I read, I assume this could be done at 5% of the mg cement to 95% of the fibrous material, in this case paper.
I guess you are telling me I should and could leave out the lime as well. OK by me.
So that only leaves the sand. Would even that be of any benefit if this material is really so strong and already forming a ceramic-like strength and material? If ceramicrete adheres and strengthens flimsy frames, I don't really see the benefit of the sand either.
Any feedback or opinions?
Any sources of this special cement in Dallas area or Texas?
Thanks.
Connie
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