I did not say you should not use clay with cement, I said concrete. There is a difference between cement and concrete. Portland cement is the gray stuff that comes in a bag. Concrete is portland cement with aggregate in it, normally sand and rocks, and enough water to work it. Dirt with cement in it is stabilized earth, not concrete.
Clay expands when it gets wet and will cause concrete to crack and spall. That is an entirely different thing from the stabilized earth that is being discussed.
spaceman All opinions expressed or implied are subject to change without notice upon receipt of new information.
On 3/24/2010 10:20 AM, Greg House wrote:
From: Spaceman <Spaceman@starship-enterprises.net>And yes, you should not put clay in concrete.Remind me why you shouldn't use clay with cement? I thought it acted as a pozzolan? Is that only certain types of clay? Thanks, Greg
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