--- In papercreters@yahoogroups.com, Stone Tool <owly@...> wrote:
>
> PC slurry with the cement in....... can be kept for how long?
In my experience, a few hours. Never tried to measure it exactly.
> What changes are there in the set properties of PC with Portland
> Cement in it after 4 hours or so as compared to fresh?
Dunno, why don't you mix a couple batches and let us know? =)
> Cement sets up as a function of hydration and time....... not
> dehydration. That means that the cement in PC will set up in a
> wet slurry or in a drying block. If "kicks" and completes it's
> chemical reaction while in a high liquidity slurry, and is held
> over and used the next day, what if any structural properties does
> the cement add? It cannot be a binder if it has already reacted.
There are plenty of studies out there that skirt this issue. If you
are willing and have the access (or the money) here are a few to
check:
http://tinyurl.com/23yddq
http://tinyurl.com/ysdoj5
http://tinyurl.com/2h5bda
> Is Portland cement the optimal material for PC, or just the most
> commonly available and cheap?
Certainly not the only one. And not cheapest, depending on your
local availability of clay, pozzolans, lime, etc. It is probably the
most widely available (and thus of most use to the broadest audience
of the list).
> What differences both long and short term are there if something
> else..... say lime or bentonite are used rather than portland?
Again, dunno. Wish I had both the time and the grant money to find
out though.
- E
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