background radiation becoming less? Solar radiation is relatively
constant and the Earth's radioactives are all decaying toward
non-radioactive (and thus non-heat contributing) isotopes. Not that we
need to worry one way or the other: geologically speaking we are all
very transient phenomena.
Agree about rebar and cracking. Cracks in concrete and masonry and in
brittle finishes, tell us a lot about what has moved: then it becomes an
issue of 1. Does this matter? and 2. If it matters, what do we do about
it. / eric
On 7/2/2011 12:00 AM, admin wrote:
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> seaint Digest for 1 Jul 2011
>
> Topics covered in this issue include:
>
> 1: StructuralPedia Forum - CEU's
> by Jeremy White<webmaster@structuralae.com>
> 2: Re: Granite Step Foundation
> by "David Merrick, Structural Engineer, Merrick Group"<mrkgp.se@gmail.com>
>
>
>
> --------------------------------------------------------------------------
> 1 Message:0001 1
> --------------------------------------------------------------------------
> From: Jeremy White<webmaster@structuralae.com>
> To: seaint@seaint.org, list@structuralpedia.com
> Subject: StructuralPedia Forum - CEU's
>
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> I have a conversation started=A0regarding CEU's=A0at the StructuralPedia =
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> StructuralPedia - Structural Engineering Continuing Education
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> 2 Message:0002 2
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> From: "David Merrick, Structural Engineer, Merrick Group"<mrkgp.se@gmail.com>
> To: SEAINT<seaint@seaint.org>
> Subject: Re: Granite Step Foundation
>
> Rather than to "prevent the crack" I believe the intent is to "reduce
> cracking", "prevent most cracking", or "preventing an unacceptable risk
> of cracking".
>
> "the crack" suggests that there is a crack already existing and you are
> now able to prevent it. Poof!
>
> To "prevent" is too absolute, all options have a risk of failure, even
> nuclear reactors designed to hold radioactive materials with a half life
> of 15,000 years, seem to only be designed for events with a recurrence
> of less than 2000 years. So like everything, there is an acceptable risk
> and in this case a crack, or for the reactor potentially adding to the
> ever growing earth's background radiation. Its sort of ok that high
> concentrations have dissipated.
>
> Large things are understood one step at a time.
>
>
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