PaintSquare.com
Follow us on Twitter Follow us on LinkedIn Like us on Facebook Follow us on Instagram Visit the TPC Store
Search the site

 

Advertisement

PaintSquare


Problem Solving Forum

| More

January 27 - January 31, 2014

Is there a definitive relationship between mechanical properties of coatings (such as elongation and tensile strength) and crack-bridging capability?

More items for Coating Materials


Selected Answers

From William Slama of International Paint/Ceilcote Products on February 10, 2014:
For a single-layer, unreinforced coating (read “coating, lining, or flooring”), crack bridging capability can be determined by finite element analysis. And the value will be primarily affected by the coating's modulus of elasticity and maximum elongation capability. However, at the surface, just over the crack, the coating theoretically encounters infinite elongation. Then, the toughness of the coating determines how much or little movement can occur before the coating tears through to the top of the coating. Further complicating this is that there will be some local surface fracturing of the concrete adjacent to the crack that will, in effect, give the coating some “stretching length” that will help it to “bridge” the crack. With the exception of very tough elastomers, the crack bridging of unreinforced systems is virtually negligible, probably only 1-3 thousandths of an inch of movement.. The “tough elastomers” that are known to bridge cracks are in the range of 400-600% elongation and 3,000-6,000 psi tensile strength. Use of these systems is limited because of theie lower cross link density, leading to lesser chemical resistance and greater permeability. What several developers/manufacturers of chemical-resistant coatings, linings, and flooring have done is to develop reinforced multi-layer systems to provide significant crack bridging capability. This is accomplished by first applying a base layer of very flexible material, then applying a fiberglass- reinforced layer and finally a chemical-resistant top layer. That system's crack bridging is somewhat predictable by engineering calculations, and actual lab simulation tests have given “reasonable” correlation to calculated behaviour. Those systems typically accomplish crack bridging capability of 0.020-0.050 inches (20-50 mils) of crack movement (opening) capability. Reference: "Physical and Mathematical Representations for the Determination of Crack-Bridging Ability of Lining Systems,"   Proceedings from the SSPC 1994 Seminars (SSPC 94-19).

Please sign in to submit your answer this question    

Tagged categories: Coating properties; Crack bridging


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

Advertisements
 
Mitsubishi Gas Chemical America
 
Performance Amine 1,3-BAC
 
A highly reactive cycloaliphatic diamine offering superior performance. Reasonable cost and curing efficacy makes it suitable for all types of epoxy resin applications.
 

 
BASF
 
New resins from BASF will have metals loving water!
 
Excellent corrosion resistance, low VOC, high gloss, thin films www.basf.us/industrialcoatings dpsolutions@basf.com 800-231-7868
 

 
Carboline Company
 
Carboline is pouring with opportunities
 
We are proud of our exceptional products and services, and believe that people are our greatest asset. Come grow with us!
 

 
Safway Services
 
Your Access Advantage. QUIKDECK®
 
Provides safe, factory-floor-like working conditions. Can be engineered to fit almost any shape, structure or size. Modular platform easily assembled from just a few basic components. Excellent containment. Applications include vessels, offshore rigs and bridges.
 

 
Jotun Paints Inc.
 
Jotun Jotachar 1709
 
Mesh-free passive fire protection epoxy designed to protect against hydrocarbon pool fire scenarios for up to four hours as defined in the ANSI/UL1709 standard.
 

 
PPG Protective and Marine Coatings Group
 
We Protect and Beautify the World
 
PPG is widely recognized as a world leader in protective and marine coatings, developing innovative, cutting-edge products and services.
 

 
Sherwin-Williams
 
Sherwin-Williams General Polymers Resinous Flooring App
 
Our coatings and linings expertise available 24/7, allowing you to explore the Sherwin-Williams systems best suited for your flooring needs. Android Users Click here to Download the app today!
 

 
US Minerals
 
Hit Harder. Clean Faster.
 
Black Diamond abrasive products are the toughest, most effective blasting media and supply the superior power you need to get any job done.
 

 
Tarps manufacturing, Inc.
 
QUALITY MADE IN AMERICA —Available near you!
 
CLICK to get a behind-the-scenes look at how Tarps Manufacturing makes the highest-quality tarps right here in the USA — available nationwide.
 

 
Abrasives Inc.
 
Discover the MAGIC.
 
Black Magic® coal slag. It’s consistent, cleaner, cuts better, less dust. Get it where you need it, when you need it. Abrasives Inc. info@abrasivesinc.com
 

 
 
 

Technology Publishing Co., 1501 Reedsdale Street, Suite 2008, Pittsburgh, PA 15233

TEL 1-412-431-8300  • FAX  1-412-431-5428  •  EMAIL webmaster@paintsquare.com


The Technology Publishing Network

Durability + Design PaintSquare the Journal of Protective Coatings & Linings 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