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ETV Program Report: Coatings for Wastewater Collection Systems - Standard Cement Materials, Epoxy Coating 4553
CIGMAT. ETV Program Report: Coatings for Wastewater Collection Systems - Standard Cement Materials, Epoxy Coating 4553. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-10/134, 2010.
To inform the public
The Standard Cement Materials, Inc. Standard Epoxy Coating 4553™ (SEC 4553) epoxy coating used for wastewater collection system rehabilitation was evaluated by EPA’s Environmental Technology Verification Program under laboratory conditions at the Center for Innovative Grouting Material and Technology (CIGMAT) Laboratory at the University of Houston. Testing was conducted over a period of six months to evaluate the coating’s (1) chemical resistance and (2) bonding strength for infrastructure applications. For chemical resistance, coated concrete and clay bricks with holidays (holes created in the coating) were used to evaluate the chemical resistance of the coating/substrate bond under a corrosive environment. Twenty coated concrete (dry and wet) and 20 coated clay brick (dry and wet) specimens were exposed to DI water and sulfuric acid solution (pH=1), and the specimens were visually inspected and weight changes measured. Evaluation of the coating-to-substrate bonding strength was determined using two modified ASTM test methods – one to determine bond strength of the coating with two specimens sandwiched together using the coating, and the second to determine the bond strength by applying a tensile load to the coating applied to specimens of each substrate. Forty-eight bonding tests were performed over the six month evaluation. The tests resulted in the following conclusions about Standard Cement’s SEC 4553 coating: • After the six-month chemical exposure tests, all dry- and wet-coated concrete and clay brick specimens, with and without holidays, showed no major change in appearance, with only some discoloration of the coating material noted; • For all 64 bonding tests, the observed failure types were substrate (77%) and bonding/substrate (33%); • Average tensile bonding strength for dry-coated concrete varied from 78 to 266 psi, with concrete substrate (62%) and bonding/substrate (38%) failures; • Average tensile bonding strength for wet-coated concrete varied from 89 to 279 psi, with concrete substrate (62%) and bonding/substrate (38%) failures; • Average tensile bonding strength for dry-coated clay brick varied from 172 to 310 psi, with all 16 of the failures being clay brick substrate; • Average tensile bonding strength for wet-coated clay brick varied from 170 to 345 psi, with clay brick substrate (81%) and bonding/substrate (19%) failures.
URLs/Downloads:ETV PROGRAM REPORT: COATINGS FOR WASTEWATER COLLECTION SYSTEMS - STANDARD CEMENT MATERIALS, EPOXY COATING 4553