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Shop Painting Vs Field Painting Of Steel Bridges The Pros And Cons

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This paper will also discuss various cost differences between shop and field painting as it pertains to new steel and we will cover two case histories of Maryland State Highway Administration jobs which had all three coats of paint applied in the shop.

Product Number: 51322-17479-SG
Author: Charles S. Brown
Publication Date: 2022
Industries: Coatings and Linings , Coatings
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$20.00
$20.00

There seems to be a trend for bridge owners to believe that applying all three coats of paint in the shop is more cost effective and will provide for a better coatings job on new steel. This paper will discuss the differences between shop coating and field painting and the pros and cons of shop applied coatings versus field applied coatings on new steel.

There seems to be a trend for bridge owners to believe that applying all three coats of paint in the shop is more cost effective and will provide for a better coatings job on new steel. This paper will discuss the differences between shop coating and field painting and the pros and cons of shop applied coatings versus field applied coatings on new steel.

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Duplex systems, also known as painting over hot dip galvanized steel, are extremely effective corrosion protection systems. However, careful surface preparation techniques need to be used to alleviate potential coating failures. The age and characteristics of the galvanized coating should be used to determine what type of surface preparation is needed. Surface preparation should develop an anchor profile for the paint without removing the zinc coating.
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Common methods of maintenance painting have either involved complete removal of existing paint (e.g., SSPC-SP 10, Near White Blast Cleaning) or highly localized preparation of corroding areas using power or hand tools (e.g., SSPC-SP 2 or SSPC-SP 3). Sometimes projects may be designed to an intermediate level where the intent is to reduce the surface preparation level of effort by allowing “good” coatings to remain. In these cases, abrasive blasting or ultra-high pressure water jetting may be used to prepare the entire surface, but well adhered aged coating is allowed to remain.
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