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Modern high performance paint systems are so durable that when exposed to natural weathering they may show only slight signs of deterioration. This means that new coatings being marketed have limited track records. Which creates an increased reliance on accelerated laboratory testing to evaluate performance.
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This paper presents the diagnostic work undertaken to determine the cause of failing coating and spalling block on the exterior of a commercial building in northern Illinois. The field assessment methods used to diagnose the problems including non-destructive and destructive methods for determining moisture content in the masonry, infrared thermography, and visual assessments are described.
Corrosion of steel reinforcement is one of the most common forms of deterioration of reinforced concrete structures, having a large impact on both their life-cycle cost, and overall performance. For example, according to the 2021 Report Card for American’s Infrastructure of the American Society of Civil Engineers (ASCE) [1], the amount of money needed to fix existing civil infrastructures in the USA is in the order of six (6) trillion USD; most of this is in connection to corrosion-related concrete deterioration.
Corrosion of steel embedded in concrete is an electrochemical process that occurs when a potential difference along the bars forms a cell with anode and cathode zones on the steel, and the pore water in the hardened cement paste serves as electrolyte [2].
Alloy 600 and its weld alloys 182 and 82 are susceptible to Primary Water Stress Corrosion Cracking (PWSCC). These alloys have often been replaced in existing PWRs by Alloy 690 and weld alloys 152 or 52, but this is not always economical or technically feasible. Thus, PWR components fabricated from Alloys 600 and 182 are still in service worldwide in locations such as Bottom Mounted Instrumentation (BMI) penetrations where both the nozzle and the J-groove welds are potentially susceptible to PWSCC.
A case study of a fiberglass reinforced plastic scrubber which was evaluated with a novel ultrasonic technique followed by a destructive evaluation for retained mechanical properties and corrosion barrier condition. When compared, the results showed good correlation.