Corrosion engineering

Hello Mr. Thanh, couples of questions needed to be answer before doing recommendations:

Are you doing the paint job in shop or between tides (yes it is possible to paint between tides we've done it couples of times) or on the jobsite, island, boat, in the ocean?

Next questions: does you concrete need resurfacing? are they brand new?

What is your schedule? Do you have only 12 hours to get the job done or 2 months?

Are your pole going in cold water or warm water... how about ice impact?

Are you doing the paint job yourself or going for a professional contractor?

Is aesthetic a concern? No one want to see best example: windtower all rusted on a coastal environment or a bad paint job on concrete in a marine aquarium!

Are you looking for long term solution without maintenance or there will be regular maintenance?

Providing the maximum details at the beginning of a job is the best way to get final results you are expecting and make the project simple as possible. I will send you by e-mail some recommendation for your project such as surface preparation, recommend thickness etc...

I have a personal and professionnal preference for elastomeric paint (polyurethane or hybrid... not polyurea) over any thick epoxy paint in marine environment.

Dear Sir,

Thank you very much for your quick reply.

Reinforced concrete power poles with diameter of 30-40cm have been installed along the coast. Over years they were damaged by chloride-induced corrosion. We are now wavering between the use of ZINGA (www.zinga.be) and some paint such as polyurethane or polyurea (we have no product supplier untill to date). Doing the paint job may be performed in shop for brand new poles by ourselves. We accept a solution with regular maintenance about every 5 years.

We are looking your recommendation.

Best regards,

Nguyen Ha Thanh (thanh.nguyen@itd.com.vn)

Our website: www.itd.com.vn

Mixer the concrete with additives of the type pozzolanic action, if concrete to state exposed to marine environment the resin and painting slow down but it does not avoid the corrosion, if outside iron or steel, to sandpaper and paint, to the concrete one you cannot do to him the same.

Ha Than:

Avoid using steel rebar or iron mesh when laying new concrete pillars, blocks, etc. Use fiberglass or aluminum rebar and mesh instead, and use fiberglass-entraned cement products, such as ferro-cement.

Mark

Dear Sir,

Thank you for your advice.

We are looking for a solution to meet request of our customers who have been acquainted with the use of reinforced concrete power poles.

Best regards.

Nguyen Ha Thanh

The last comment was a good point; in marine environments we use epoxy coated rebar. The rebar is usually pre-coated prior to our procurement. But you could do it yourself with a suitable polymide epoxy (high soilds content to produce a very hard durable finish).

Ha Thanh:

In that case, I recommend hard setting for a longer pole life; but you're probably doing that already anyway.

Mark

I would use polyurea or polyaspartic coating technology

you could spray apply this as a rubber boot on the bottom of the pole prior to installation.

contact www.enviroprotectivecoatings.com

contact Mr. Homer Hart