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Re: Lighting damage to concrete foundation

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Thanks for your time on this.  If we follow through, I
will let you know what we uncover.
Jim Wilson

--- Daryl Richardson <h.d.richardson(--nospam--at)shaw.ca> wrote:

> Jim,
> 
>         I discussed this situation with a colleague
> who is a retired Ph.D. 
> having spent most of his career in reinforced
> concrete materials technology. 
> He has never personally experienced lightning
> striking concrete before.  The 
> results of our discussion went something like the
> following.
> 
>         We do not think that there is any change in
> the chemistry or other 
> characteristics of the concrete.  We have no
> scientific knowledge to back 
> this opinion; this is just our personal expectation.
> 
>         We think that if the electric current
> traveled through the 
> foundation this current flow would result in very
> high current flow in the 
> reinforcing steel.  We don't believe that this would
> affect the properties 
> of the steel in any long term way.  However,  it
> could conceivably heat the 
> steel to a high level which may change the
> metallurgy; others on the list 
> will know more about metallurgy than I do.  Hot
> reinforcing will probably 
> expand and could cause cracking and delamination of
> the concrete in much the 
> same way that corrosion of the steel (such as
> parking structures, for 
> example) would do.
> 
>         I hope these thoughts are useful to you.
> 
>         This is a very interesting problem.  Please
> post your findings in 
> the list if you can.
> 
> Regards,
> 
> H. Daryl Richardson
> 
> 
> ----- Original Message ----- 
> From: "Jim Wilson" <wilsonengineers(--nospam--at)yahoo.com>
> To: <seaint(--nospam--at)seaint.org>
> Sent: Monday, August 22, 2005 9:30 AM
> Subject: Lighting damage to concrete foundation
> 
> 
> >I had a call from a residential client with a house
> > struck by lightning.  She claimed that the
> lightning
> > entered the house through a septic line and blew
> the
> > interior foam insulation off the inside wall of
> the
> > poured concrete foundation.  The lightning then
> > traveled through the foundation and blew the
> > insulation off of a couple of other areas.
> >
> > I've never heard of such a thing but it got me
> > wondering if lightning can damage either the
> chemical
> > structure of cured concrete or if it can damage
> the
> > reinforcing steel.  Supposedly, there is some
> cracking
> > in these areas, but no one's sure if it is new or
> not.
> > I couldn't take a stab at that assessment until I
> had
> > a look at it.
> >
> > Any thoughts?  It sounds liks the insurance
> company is
> > waiting for a professional opinion of how much
> > investigation is required to assess the problem.
> >
> > Jim Wilson, P.E.
> > Stroudsburg, PA
> >
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