[Cob] pozzolanic concrete - new_Very old thread

[Marlin]

Hey all,,

You're mortar questions made me think to ask what anyone's experience with pozzolanic (sp?) concrete for mortar has been. We've had some good trial runs building a 'small' foundation of mortared urbanite (broken sidewalk concrete chunks) with it but our proportions, due to the circumstances was very sloppy...it worked great, setup, held great etc.

But now we've got the major project here in Madison, would like some opinions (hopefully experiences/references) as we're into about a 70 ft foundation - rubble trench w/urbanite stacked and mortared on top.

We used soaked lime, coarse sand, burnt clay (potters stuff) and as I said the proportions varied quite a bit. We've heard in ancient times it was very specific to make the awesome concrete that Romans and others did but there might have been other additives (sorry no cactus juice local to Wisconsin!)

Best,

Marlin



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