[TowerTalk] bentonite and substitutes

[David Robbins]

fly ash is another one used for conductivity enhancer in concrete:  see some of these: https://www.google.com/?gws_rd=ssl#q=fly+ash+concrete+mix+conductivity
  this is a pretty comprehensive one:  https://www4.uwm.edu/cbu/Papers/2009%20CBU%20Reports/REP-645.1.pdf



Jan 19, 2016 10:35:31 AM, jimlux at earthlink.net wrote:

I know the literature is full of using bentonite as a conductivity 
enhancer. I wonder if there are other substances that may be more 
readily available in smallish quantities that would work as well.

Bentonite is mined by the thousands of tons, and has lots of industrial 
uses (drilling mud, cat litter, impervious clay liners for ponds, etc.). 
And when people were looking for something to dump into the hole with 
the ground rod, they probably had it around, so that's what got used.

I assume it's cheaper than concrete (if for no other reason than you can 
deliver it in a dump truck, as opposed to a mixer truck, and it doesn't 
have a very short "shelf life" after mixing).

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