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65451Re: Mohegan frindship sloop and ballast

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  • vscopeland
    Feb 1, 2011
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      Great post. Thanks for that practical knowledge.

      --- In bolger@yahoogroups.com, "Chester Young" <chester@...> wrote:
      >
      > As a consultant in the marine engineering field doing shoreline
      > revetment work I prefer galvanized grade 60 rebar to epoxy coated. 1st
      > issue is that concrete does not adhere to the epoxy coating. Any chip
      > in the coating is a vector for rust along the rebar, and when it does
      > fail it tends to do so in large sections. Observation after failure has
      > shown where long sections of rebar would separate from the concrete due
      > to the epoxy surface being smooth. Fortunately there is not a lot of
      > epoxy coated steel used in the private sector, bridges are a complete
      > other animal with extensive installation procedures to eliminate
      > penetration through the epoxy.
      >
      >
      >
      > Just my 2 cents worth, for what it is worth.
      >
      >
      >
      > Caloosarat
      >
      >
      >
      > From: bolger@yahoogroups.com [mailto:bolger@yahoogroups.com] On Behalf
      > Of Eric Kramp
      > Sent: Monday, January 31, 2011 9:45 PM
      > To: bolger@yahoogroups.com
      > Subject: [bolger] Re: Mohegan frindship sloop and ballast
      >
      >
      >
      >
      >
      > First time responding. In regards to concrete encased on concrete, it's
      > important to remember that the concrete is protecting the steel while
      > the steel is providing tensional strength. Concrete in water makes a
      > basic solution, and steel tends to rust in an acidic.
      >
      > I've chipped away concrete from 50 year old rebar and the steel looked
      > quite good. Large cracks, on the other hand, will defeat this
      > combination.
      >
      > If I were in a position to build a boat of this size right now, I'd
      > research epoxy-coated resteel. Bridge resteel is pretty inexpensive
      > compared to bare steel, and would provide a low-oxygen environment for
      > the steel.
      >
      > -Eric
      >
      > From Peter:
      > >
      > > It's not just concrete. It's concrete with embedded iron or steel
      > > scrap. If the metal starts to rust, you are going to have a big mess,
      > > so it's necessary to be sure the metal is entirely encapsulated.
      >
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