ACI code requires the concrete to have a minimum of 3" of "cover"
concrete whether between the rebar and the outside world - either the
concrete form or the ground. This "cover" allows the full strength of
the rebar to be utilized in the structure.
Steve NA0IA
At 08:55 PM 7/17/2013, David Gilbert wrote:
Your hysterics aside, almost all of that is patently false, and in
most locations is directly contrary to code. You really need to
study what a Ufer ground is and why they work.
By the way, this same old wives tale comes up every so often here
and on other forums, and each time it does I spend about a half hour
doing Google searches to find any documented instances of a block of
concrete exploding because of steam expansion from a lightning
strike. I have found TONS of discussion and endless repetitions of
the same old exhortation you just made, but not a single first hand
account of exploding concrete due to steam. Concrete is quite
brittle and fractures easily, and I could far better imagine that
the intense thermal shock generated by a lightning hit would instead
be the culprit. I have indeed witnessed first hand a lightning
strike blasting a chunk out of solid granite rock alongside the road
I was driving on (scared the hell out of me), and I guarantee that
rock was dry as a bone.
Dave AB7E
On 7/17/2013 9:18 AM, Skip K3CC wrote:
I'm not sure I understand the thread however, NEVER EVER, ground anything
into the concrete base !!!!!!! NEVER use any ground rods in concrete !!!!
If you would get a lightening strike, the current would carry into
the concrete
and boil off the water. When this happens the concrete will explode !!!
de Skip K3CC _______________________________________________
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