×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Saltwater Corrosion

Saltwater Corrosion

Saltwater Corrosion

(OP)
I have a project where a contractor has questioned using helical anchors in a coastal region. There is a high water table at the site, and the geotech has recommended helical anchors. Anyone experienced with saltwater corrosion of helical anchors? The site is several miles inland.

RE: Saltwater Corrosion

Of course it depends on the site geology, but in the Southeastern US, the coastal water table is high, but ground water is typically fresh (not necessary potable) unless you are very close to flowing salt water - say within a few hundred feet, or so from the ocean, tidal saltwater creek, estuary, marsh etc.

www.SlideRuleEra.net reading

RE: Saltwater Corrosion

(OP)
It is in South Florida. Looking more closely at the site, it is only a few hundred meters from a brackish/marine lake. Maybe this generated the contractor's comment.

I think the concrete caps on the anchors could be extended to below the water table fluctuation line, and corrosion be completely taken care of even if there is salty water at the site. One installer of the anchors believes the design life of the anchors to be in excess of 50 years without modifications to the concrete caps (part of the anchors experiencing saltwater table fluctuation).

RE: Saltwater Corrosion

You may test the soils for "soluble sulfates" and see if you're at severe range or at negligible range. Based on the test results, Type V cement may be needed or you may proceed without worries.  Your local Geotechnical engineer would know more about your local variations.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources