La Corrosion En Puentes De Acero

Chapter 23

Corrosion Protection
of Steel Bridges

National Steel
Bridge Alliance

STEELBRIDGEDESIGNHANDBOOK

Disclaimer
All data, specifications, suggested practices, and drawings presented herein, are based on the best
available information and delineated in accordance with recognized professional engineering principles and practices, and are published for general and proceduralinformation only. Procedures and
products, suggested or discussed, should not be used without first securing competent advice respecting their suitability for any given application.
Publication of the material herein is not to be construed as a warranty on the part of the National Steel
Bridge Alliance - or that of any person named herein - that these data and suggested practices are suitable forany general or particular use, or of freedom from infringement on any patent or patents.
Further, any use of these data or suggested practices can only be made with the understanding that
the National Steel Bridge Alliance makes no warranty of any kind respecting such use and the user
assumes all liability arising therefrom.

Table of Contents

Introduction and Background.............................................................................1
Key Issues............................................................................................................1
Environment .................................................................................................1
Materials ofConstruction..............................................................................6
Coatings for Blasted Steel .......................................................................6
Metalizing ..............................................................................................8
Galvanizing ............................................................................................8
Weathering Steel....................................................................................9
Design Detailing .........................................................................................10
Cost............................................................................................................13
Fabrication Costs ..................................................................................14
Maintenance Painting costs..................................................................14
Cost of the Coating System..................................................................14
Life of Coatings ....................................................................................15
Corrosion Protection by Use of Weathering Steel..................................16
Financial Considerations.......................................................................16
Sample Analysis ....................................................................................17
Results ..................................................................................................17
Risk.......................................................................................................18
Summary..........................................................................................................19

Corrosion Protection
of Steel Bridges
INTRODUCTION
and BACKGROUND
Corrosion is a serious threat to the longterm function and integrity of a steel
bridge. Structural steel will corrode if left
unprotected or inadequately protected
from the natural environment. This corrosion can take the form of general uniformthickness loss or concentrated pitting
depending on exposure to the environment and the steel design detail in question. The designer should view corrosion as
a long term threat to the integrity of the
bridge structure – a critical design consideration that must be addressed in a rational manner during the design process.
Corrosion is a time-based process that generally takes several years...