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Home > Forums > Engineering Forums by Industry > Concrete Engineering > -Concrete Engineering general discussion Forum

etching

Read More Threads Like This One

mobi1 (Automotive)

5 Jun 12 23:06

any concerns about using a 15% muriatic acid solution to etch old 5 " reinforced concrete lanai slabs with hair line cracks ?

Can this concentration possibly corrode rebar even if thoroughly immediatly flushed with water after surface reaction ?

thanks

Ron (Structural)

6 Jun 12 12:20

I always have concerns about using acid etchants for reinforced concrete.

You don't mention why you want to etch, but consider using an acid that would be more likely to be completely consumed in the etching reaction, such as citric acid. It is readily available and will etch sufficiently for laitance and coatings.

Neutralize any acid application with an appropriate alkaline application after etching. Bicarbonate of Soda works fine for most applications.

mobi1 (Automotive)

6 Jun 12 22:36

Mahalo Ron

this is just the kind of advice we need and yes this is in regard to recoating lanai slabs at our condo complex on Kauai Hawaii. We have had coating failures as the original trowelled smooth slabs where not etched.

Ever been to Kauai ? ...if not this might entice you.

Link

once again many thanks !

Bob M.

Ron (Structural)

7 Jun 12 5:59

Bob...WOW! Pretty amazing. Better keep the secret though!

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