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Date: | Wed, 3 Apr 2002 19:48:30 +1000 |
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][<en
> There is a fairly detailed report on exactly what
> was done at the lighthouse at this website:
> http://www.montauklighthouse.com/restoration.htm
Having read the report, I'd have to say that it sounds
to me like people tried to do their homework, and that
the contractor was not necessarily a fly-by-night.
If I were going out there, I'd be thinking about
having a damn good look at the condition of the
sandstone, just in case it is not a failure at the
interface of the coating and the sandstone, but a
failure within the body of the sandstone.
I suspect that original salt content of the sandstone
masonry would have quite high ... especially at lower
levels where rising damp could well have been a major
issue (and just where have they found that the coating
is debonding ... at lower levels or all over?).
Yes ... drill dust samples from the sandstone would be
useful ... same type of approach as with concrete dust
samples ... take samples from defined depths so that
you can compare salt contents with depth. If you go
that far, then you can have the samples analysed by
x-ray diffraction to identify the actual salt
compounds, rather than by water dissolution and
chemical analysis, which just tells you the ions
present.
If you need somebody to abseil the lighthouse ... I
might be passing through around April 15 ... but doubt
I'd have time!
Good luck
david
http://www.sold.com.au - SOLD.com.au Auctions
- 1,000s of Bargains!
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