The Angus L. Macdonald Bridge is a 1.3-kilometer-long (4,265-foot-long) cable suspension bridge that carries automotive traffic over the Halifax Harbour between Dartmouth and Halifax. There are four approach spans to the west cabl...
Introduction – Precast concrete is cleaned and painted for both beautification and protection. Painting may involve the use of protective coatings, stains, or water repellents. For the materials to adhere and provide t...
The purpose of expendable and recyclable abrasives as used in this article is to prepare surfaces for the subsequent application of protective coatings. The SSPC glossary defines expendable and recyclable abrasives as follows: Exp...
Most of the SSPC surface preparation standards focus on the preparation of steel, either by abrasive blast cleaning (dry and wet), power tool cleaning, or water jetting. Recognizing that galvanizing, non-ferrous metals and v...
When all coats of a paint system are applied to bridge steel in an enclosed shop, the quality of the cleaning and painting is typically quite good. The steel is blast cleaned and painted in a controlled environment, minimizing or...
Moisture in walls can affect the performance of coating and water-repellent systems. While ASTM publishes standards for determining the moisture content of cementitious substrates, their primary focus is concrete floors. Until thi...
When steel is shop-painted, it is usually primed with a zinc coating, and the remaining coat(s)applied to all surfaces except the top of top flanges that will be embedded in concrete. If shear studs will be installed in the top f...
As a building owner, if you begin to suspect that the paint on your building has faded and become dull, your next concern may be whether there is a way to prove that has occurred. Additionally, you will want to know if you have an...
When paint is blistering and peeling, laboratory analysis is often required to determine the cause. But what types of samples are needed, and how should the samples be collected? These are important questions, as the greatest sour...
Bare galvanizing provides excellent corrosion protection at a pH between 7 and 13, but corrosion of the zinc increases as the pH becomes more acidic (less than 7), or more alkaline (greater than 13). When galvanizing is exposed t...
