PaintSquare.com
      | Connect Follow us on Twitter Like us on Facebook
About | Subscribe | Advertise
  

 

Problem Solving Forum

| More

March 5 - March 11, 2012

What’s the best way to prevent corrosion of reinforcing bar in concrete?


Selected Answers

From Glenn Summers of ConselcoR, Inc. on March 5, 2012:
I use a penetrating sealer that forms a solid within the gel-pore/capillary system of the matrix. This results in a No/Low moisture oxygen content interior. This material applied to the concrete surface prevents carbonation which lowers the pH. By maintaining the high pH passivating layer on the embedded steel, corrosion does not occur. The ideal application is on new concrete, as soon as possible; however, an aged concrete also benefits with a low R/H interior.

From James Albertoni of CA Department of Water Resources on March 5, 2012:

     The high alkalinity/pH in the concrete will naturally passivate the steel reinforcing bar, thereby mitigating corrosion. So under normal circumstances, the reinforcing bars do not need any corrosion prevention.

     If the concrete is in a highly corrosive environment such as seawater, high chloride area, or chemical containment, there are a few additional corrosion protection measures that can be utilized. The reinforcing bars can be cathodically protected or epoxy- coated. Additionally, a thicker concrete cover could be used or a coating can be applied to the concrete.

From Jim Haig of UniQuest on March 8, 2012:
I agree, James. The only additional comments I could make are to ensure that the correct cement and concrete formulation is used (e.g., use of sulfate-resistant cement where appropriate) and that the concrete is placed with the specified cover and compaction and consolidation. Porous concrete will be less resistant to environmental factors. In short, effort spent in ensuring the protective concrete is A1 will save potentially huge maintenance expenses later when the rebar begins to corrode and the concrete spalls.

Please sign in to submit your answer this question    

Tagged categories: Concrete; Corrosion; Rebar


Current PSF Question | Submit a PSF Question | Full PSF Archive

Chicago Corrosion Group
Vendor-neutral corrosion consulting

What you don’t know about painting is costing you a fortune. Call today to see how CCG’s vendor-neutral, owner’s advocacy saves our clients millions.


U.S. Zinc
Historic Reliability. Innovative Performance.

As an industry leader with an established global footprint, we provide the products that prolong the life your paints and coatings. U.S. Zinc – Helping the world work™


Termarust Technologies
Termarust (HR CSA) Chemically Stops
Active Corrosion

Truss bridge treated in 2000 with Termarust's (HR CSA) field-proven rust mitigation system chemically stopped corrosion, crevice corrosion & pack rust.


Corrosion Probe, Inc.
From Detection to Correction

Corrosion Probe, Inc. has the Most Concrete Coatings Experience and Expertise. Contact us today at
860-767-4402, www.cpiengineering.com


BASF
New resins from BASF will have metals loving water:

Excellent corrosion resistance, low VOC, high gloss, thin films basf.us/industrialcoatings
polyorders@basf.com
800-231-7868


Midsun Specialty Products
Stopaq 30+ Year Coatings

Use Stopaq corrosion prevention coatings on pipelines, field joints, tank chimes, structural steel and more. Learn more at www.midsunsp.com/stopaq


Trelawny Surface Preparation Technology
Surface Preparation Equipment

Manufacturer of needle scalers, grinders, scarifiers and scabblers. Pneumatic tools for Marine and Construction. US distributor CS Unitec: 800-700-5919


AGC Chemicals
LUMIFLON® FEVE Resins used in 2014’s Tank of the Year

LUMIFLON based coatings can last up to 30 years without fading, offering a low-
maintenance solution that retains color and gloss and can be field-applied.


Abrasives Inc.
Check our Prices for Blast Abrasives

Faced with higher abrasive costs? We invite you to call & check our rates on Black Magic® coal slag and other quality blast materials. Abrasives Inc. 800-584-7524

 
 
 
Technology Publishing

The Technology Publishing Network

The Journal of Protective Coatings & Linings (JPCL) PaintSquare
Durability + Design Paint BidTracker

 
EXPLORE:      JPCL   |   PaintSquare News   |   Interact   |   Buying Guides   |   Webinars   |   Resources   |   Classifieds
REGISTER AND SUBSCRIBE:      Free PaintSquare Registration   |   Subscribe to JPCL   |   Subscribe to PaintSquare News
MORE:      About PaintSquare.com   |   Privacy policy   |   Terms & conditions   |   Site Map   |   Search   |   Contact Us
 

© Copyright 2000-2015, Technology Publishing / PaintSquare, All rights reserved
2100 Wharton Street, Suite 310, Pittsburgh PA 15203-1951; Tel 1-412-431-8300; Fax 1-412-431-5428; E-mail webmaster@paintsquare.com