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The Use of sacrificial anode cathodic protection has successfully prevented the corrosion of both new and old corroding prestressed non-cylinder concrete pipelines. Field results from 5 new and 3 old lines, which have been cathodically protected for up to 18 years, are reported. In all cases the required potential difference criteria. have been achieved with current densities in the range 0.2 to 1.8 mA per square metre of steel surface area.
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After 35 years or longer in service, the concrete infrastructure in wastewater collection systems and treatment plants has deteriorated due to various corrosion and physical degradation mechanisms. This paper reviews the major mechanisms that cause deterioration of concrete and protective coatings. Also, examples of infrastructure degradation are presented along with a discussion of the best diagnostic methods for condition assessment of concrete for the various mechanisms.
This paper outlines the aggressive service conditions experienced by wellhead casings and the resulting failures seen to date in the Alberta oil patch. Deleterious in-service conditions include; high temperatures and significant temperature fluctuations, expansion and contraction of the steel substrate, and the wet and dry oxidizing micro-environment, the influence of concrete, and a plethora of chlorides and other contaminants elevating the corrosion rate. Previous corrosion mitigation programs and current inspection techniques are reviewed.
HISTORICAL DOCUMENT. One procedure for measuring the surface profile of abrasive blast cleaned steel. The measurement technique uses a tape that replicates the surface profile.
Many people ask what is the difference in painting a CMU Block Building versus a concrete tilt wall building? And why is it the preferred building type of the big box stores? First, we must understand the real difference in construction of the two building types, to better understand the types of coating systems that work best on the specific substrates to be coated.
This NACE International standard has been prepared to provide users and manufacturers of embeddable anodes with a test method for evaluating the anode material to an expected lifetime criterion. Historical Document 1994
Restoration of steel and concrete surfaces has relied heavily on sandblasting and other dry blasting techniques. For over a century, dry blasting has been an effective, but dusty approach in removing coatings, contaminants, corrosion, and residues, with emissions of silica and other abrasive or substrate particles linked to negative health and environmental impacts.
High-strength steel is one of the basic materials for supporting a well-functioning society. Prestressed concrete (PC) is a typical example of a material in which high-strength steel is used. In PC, tensile stressed steel is embedded inside the concrete, and internal bars apply compressive stress to the concrete for preventing cracks in concrete that is vulnerable to tensile stress. Moreover, corrosion inside the steel is suppressed by the alkaline environment in the concrete, so the concrete and internal bars basically work to compensate for each other's weaknesses.
Tensile pull-off adhesion testing is becoming a more frequent specification requirement for in situ quality assurance testing to confirm proper surface preparation and adhesion of high performance protective linings applied to concrete. It is also becoming a widely used test for forensic analysis of protective linings in existing installations. There have been numerous investigations leading to the development of different devices and test pull-off adhesion methods used to assess bond strengths of mortars and overlay materials