PSN-L Email List Message
Subject: Re: Concrete testing done
From: "Daryl P. Dacko" mycrump@........
Date: Mon, 05 May 2003 19:46:04 -0400
At 04:16 PM 5/5/03 -0700, you wrote:
>Translation: You can cast whatever you want out of this mix, so long as
>you vibrate it adequately to remove air pockets according to the
>intended purpose. The section I am designing for my Lehman base will
>weigh ~ 68 lbs at 36" length and will at least as stiff as any available
>steel section (like I-beams or structural tubing) of the same weight.
>If this proves to be adequately noise-free, it will be a very cheap
>(cement and sand cost <$20) way to build very stiff structural members.
I tried casting a large table out of a very simular mix, for some holography
experiments, and had a lot of problems with flexure during the cure.
It finally settled down after a few months, but I still see some seasonal
flexure due to temperature and humidity diffrences.
I think that a pre-stressed approach would be a lot better, but of course,
it would remove a lot of the reasons for useing concrete to begin with.
The table was 4' by 8' by 3 1/2 inches thick...
For what it's worth,
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