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Hi Dave, interesting problem and not unusual.
As is common there is a difference in the practical applications
of a definition from the pure theoretical one. Yes the two do
have different expansion rates, but there are many practical
uses where adverse effects are minimal. From experiments done
back in the 60's, it seems that conclusions were drawn that as
a mix the two could not be combined for hull construction for
any lasting positive use. Over the years I have experimented
more and more as well as studying the results of epoxy use on
ferroboats. Although I have not used it in a mix during construction.....I
have used it to make a mortar mix for larger repairs....in small
quantities as a filler....as a protective skim and surfacer....as
an adhesive direct to both hulls and decks for fitting out. In
all instances considerable care and preparation is needed as
there are many pitfalls leading to failure. In your case it's
hard to define the problem accurateley without seeing first-hand.
I would hazard a guess that the plaster deck in the area where
it has lifted, was faulty with either voids, sandwich effect,
or a surface crust formed from too much/or metal floating by
the plasterer. Regards
Colin Brookes....colb@xtra.co.nz |
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