Development length of steel reinforcement with corrosion protection cementitious coatings

Development length of steel reinforcement with corrosion protection cementitious coatings 1 Introduction</h5> The deterioration of concrete structures due to the corrosion of reinforcing steel is currently a major concern in North America. A recent report indicates that about 11% of bridges in the USA are structurally deficient and need repair [1] . In Canada, more than 40% of bridges are over 40 years old and the total maintenance or rehabilitation cost is estimated at $10 billion [2] . Corrosion-resistant alternatives to conventional steel reinforcement such as epoxy-coated reinforcing steel, stainless steel and MMFX steel, have been used to varying levels of success and each possess their own set of drawbacks.</P>Epoxy-coated reinforcement was developed in the early 1970s in North America. Epoxy resin works as a protective film and electrical insulator coating the surface of reinforcing steel. One of the main difficulties associated with the application of epoxy-coated reinforcement is the cracking of the coating at bends in the bar and damage during transportation and handling [3] . Localized pitting corrosion at the location of damage or defects in the coating layer can cause a significant reduction in strength; damage to the coating layer comprising less than 2% of the rebar surface area has been reported to greatly detriment http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Cement and Concrete Composites Elsevier

Development length of steel reinforcement with corrosion protection cementitious coatings

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Publisher
Elsevier
Copyright
Copyright © 2015 Elsevier Ltd
ISSN
0958-9465
D.O.I.
10.1016/j.cemconcomp.2015.04.003
Publisher site
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Abstract

1 Introduction</h5> The deterioration of concrete structures due to the corrosion of reinforcing steel is currently a major concern in North America. A recent report indicates that about 11% of bridges in the USA are structurally deficient and need repair [1] . In Canada, more than 40% of bridges are over 40 years old and the total maintenance or rehabilitation cost is estimated at $10 billion [2] . Corrosion-resistant alternatives to conventional steel reinforcement such as epoxy-coated reinforcing steel, stainless steel and MMFX steel, have been used to varying levels of success and each possess their own set of drawbacks.</P>Epoxy-coated reinforcement was developed in the early 1970s in North America. Epoxy resin works as a protective film and electrical insulator coating the surface of reinforcing steel. One of the main difficulties associated with the application of epoxy-coated reinforcement is the cracking of the coating at bends in the bar and damage during transportation and handling [3] . Localized pitting corrosion at the location of damage or defects in the coating layer can cause a significant reduction in strength; damage to the coating layer comprising less than 2% of the rebar surface area has been reported to greatly detriment

Journal

Cement and Concrete CompositesElsevier

Published: Jul 1, 2015

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