The first quality assurance step is to put requirements in place to ensure that an experienced and qualified applicator is performing the application of the epoxy lining system.
Some key items to review when considering an applicator include:
A contractor certification program is performed by the lining manufacturer and is designed to:
Surface Preparation for both new and existing concrete is a key quality assurance step wherein all contaminants (including form release agents) and weak concrete are removed in accordance with SSPC-SP13/NACE 6 standard.
Surface preparation methods such as hydro blasting, abrasive blasting or hand tooling may be implemented.
Surface preparation should attain a uniform surface profile equivalent to the International Concrete Repair Institute – Concrete Surface Profile of 4-6 as detailed in ICRI Guideline No. 03732.
Substrate resurfacing materials come in cement-based, epoxy-based and epoxy-modified cementitious formulations. Resurfacing functions as a key step in the process of a successful lining application.
Some of the reasons substrate resurfacing is important include:
Please note that material used for patching, filling or resurfacing MUST be compatible with the chosen protective lining material.
For over 30 years, the Sauereisen SewerGard 210 100% Solids Epoxy Lining System has served as the ultimate corrosion protection for municipal wastewater environments exposed to corrosion caused by H2S gas and other chemicals.
The system can be applied over damp concrete in a variety of different methods including trowel, airless spray, plural component application and more.
Quality Assurance Testing is performed in order to ensure optimum lining performance.
There are two main quality assurance tests recommended:
High-Voltage Spark Testing is a test designed to detect pinholes or voids in a lining. At 100 volts per mil of thickness, this test permits a time efficient lining repair prior to placing a unit into service.
Adhesion testing (also called pull testing) is performed to confirm adhesion of a protective lining to the prepared substrate as laid out in ASTM Standard D7234-12. The standard requirement for a successful lining is 200 psi.