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

Termarust Technologies
Termarust (HR CSA) Chemically Stops
Active Corrosion

Arch truss treated with Termarust's (HR CSA) in 2003. This steel arch bridge is rust free on all surfaces including the crevice corroded joints and connections.


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


U.S. Zinc
Historic Reliability. Innovative Performance.

We offer custom grades and packaging of zinc dust, oxide, metal and fines, U.S. Zinc provides direct shipping to locations worldwide. U.S. Zinc – Helping the world work™


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


LS Industries
LS Blasters: Optimum Steel Cleaning Efficiency

Simplify surface prep with the precise shot control of LS Blasters. Our blast technology delivers optimum coverage and finish. 800-533-8008


Clemco Industries Corp.
Global engineering-trusted solutions

For more than 70 years, Clemco has provided the highest quality blast equipment with a total commitment to comfort and safety.


Axxiom Manufacturing
Revolutionary Units

By integrating Schmidt's Aftercoolers with our blast pots, these systems remove moisture from air and minimize equipment footprint on jobsite.
Call 1-800-231-2085


HoldTight Solutions Inc.
NO FLASH RUST -
NO CONTAMINANTS

Our HoldTight®102 salt remover & flash rush inhibitor prevents flash rust by removing surface contaminants.
Contact us for your nearest distributor. (800) 319.8802 sales@holdtight.com


Industrial Vacuum Equipment Corp.
Hurricane Vacuums
& Dust Collectors

Vacuum and dust collector hose, filters and related accessories.
IndustrialVacuum.com

 
 
 
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