[Cob] Burnt clay

[Amanda Peck]

I'm not at all sure that I know what burnt clay is--do you get it by 
powdering bricks, buy it as grog from the pottery supply, or is it something 
a bit more specific?  It's supposed to be acting as a pozzolan, would 
fly-ash be a substitute?

I'm no help here.
......................
Georgie asks about burnt clay:
    Hello!
    I am trying to make roman concrete for mortaring an urbanite
    foundation,
    and am needing some powdered burnt clay. I wonder if anyone has ever
    heard
    of this, and if so, where to get it? I need it for this weekend, so
    your
    timely assistance would be appreciated!
    Georgie
    [1]www.cobinthepark.ca

References

    1. http://www.cobinthepark.ca/
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