Project Brief
In a water treatment plant in South Carolina, USA, the client was upgrading their 52-year-old concrete basin. During this upgrade, the contractor was removing sections of the concrete walls to make space for new troughs.
Having been coated with AquataPoxy A6 15 years previous, the concrete walls were still in great condition with only 2 areas showing damage. The first was outside the construction area from the replacement of the new troughs. These areas included a 10 pence sized area that appeared to have been caused by impact damage. The second was a 7 x 12cm area approximately 25mils thick. This appeared to have been topcoated outside of the recoat window. It appeared used as a cosmetic repair, covering an area that had holiday repairs.
“Raven is pleased to offer, not only a quality product but also a solution, that continues to stand the test of time,” stated DJ Wroble, Sr. Vice President, Raven Lining Systems. “To be able to stand here 15 years later seeing our product doing its job and protecting this city’s infrastructure is something to be proud of in this very competitive market.”
Our Solution
Testing was performed by glueing seven 20mm dollies to the coating surface with a fast setting, high strength epoxy. After allowing the glue to set for 24 hours, the dollies were then cored using a 20mm coring hole bit. The adhesion test was performed using a Defelsko Positest AT. All tests were performed in Filter Basin #10.
Pull Test Results
Pull 1: 619psi (95% substrate, 5% cohesive failure in coating)
Pull 2: 714psi (100% substrate failure)
Pull 3: 488psi (100% substrate failure)
Pull 4: 621psi (40% substrate, 60% adhesive failure between substrate and coating)
Pull 5: 251psi (75% substrate, 25% adhesive failure between substrate and coating)
Pull 6: 723psi (100% substrate failure)
