City of Tampa, Wastewater Department – Tampa, FL, USA
Trowel-applied, Structural Epoxy – for use in concrete repairs and as a sectional liner (T-Lock tie-in)
Howard F. Curren Advanced Wastewater Treatment Plant – JC1
August 11, 2009
(certified contractor: Service Painting of Florida)
The City of Tampa invited Epoxytec and Service Painting of Florida (certified Epoxytec applicator) to the Howard F. Curren Advanced Wastewater Treatment Plant to conduct testing and inspection of Junction Chamber #1.
A visual inspection of JC-1 revealed a corrosive discovery affecting the concrete structure and the previously installed mechanical liner (T-Lock).
To demonstrate and evaluate a sectional liner tie-in recommended by Epoxytec, an area of the T-Lock was removed.
After removing a vertical strip of T-Lock, the exposed concrete behind it proved to have been attacked by Hydrogen Sulfide’s (H2S) microbiological sulfuric byproduct. The sulfuric acid accumulated, in concentrate behind the liner and therefore deteriorated the concrete at an accelerated rate as compared to the concrete below the water line.
Above – the peeled section of the T-Lock.
The concrete section that was targeted for rehab evaluation was prepared utilizing 35,000psi UHP hydroblasting.
In addition to hydroblasting, the edges of the T-Lock remaining were top-anchored with metal termination strips.
The prepared concrete section was recommended to be rehabilitated and sectionally lined with Epoxytec CPP. This sectional evaluation will demonstrate a 100% solid trowel-on epoxy to rebuild and line in a one-shot application in order to minimize downtime for a speedy, 1-step application.
The Epoxytec CPP is recommended in addition to the other benefits also because this chamber was left with water (sewage) in it, pumped down. CPP cures on saturated surfaces, and therefore is moisture tolerant. This makes the material a prime selection in logistically challenging environments, such as in this case – where concrete is saturated, adhering to previously installed liner is a requirement, and when resurfacing and lining need to be applied in one-application.
The versatility of Epoxytec CPP for patching, sectional, repairs, rebuilding, and as a 100% epoxy liner can be observed on this project. The material is structural and cures with an impressive 16,000 psi compressive strength.
After the material is applied in total thickness – it is then back-rubbed with water to knock-down all trowel marks, making the final coat consistent and smooth.