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Fwd: Re: Concrete in Salt Water Environment

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Lynn Howard wrote:

  Dear List Members:
  We are involved in designing some structures that are for use in a
  research laboratory for marine environment (salt water).  This is
  in the US, and is in an area where freeze-thaw cycle is not an issue

  (Santa Barbara).
  I am in a quandary as to what to do with the reinforcing steel.  We
  going to use type V concrete, cover all steel with 2.5" minimum
  use a strength of concrete in the range of 5000 to 7000 psi, and use
  low W/C ratio (around .45)
  We are also going to be using a carefully selected source and
  for our aggregate, to get a high density, low permeable, low
  reactive ....


ACI 318-95 gives some guidance.  See Section 4.2.2 and Table 4.2.2.

w/cm ratio in your application should not exceed .40.   You might
consider the addiiton of superplasticizer since the .40 w/cm ratio will
result in a very stiff mix, and make sure you get proper consolidation.
The addition of fibers should also be considered in an effort to
minimize micro-cracks.

The 2.5" cover is also a very good idea protective measure.

Lew Midlam, P.E.

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Richard Lewis, P.E.
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