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ETV Program Report: Coatings for Wastewater Collection Systems - Protective Liner Systems, Inc., Epoxy Mastic, PLS-614
Citation:
CIGMAT. ETV Program Report: Coatings for Wastewater Collection Systems - Protective Liner Systems, Inc., Epoxy Mastic, PLS-614 . U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-10/135, 2010.
Impact/Purpose:
To inform the public.
Description:
The Protective Liner Systems International, Inc. Epoxy Mastic PLS-614 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 Protective Liner Systems’ Epoxy Mastic PLS-614: • 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 slight discoloration of the coating material noted; • For all 48 bonding tests, the observed failure types were substrate (56%) and bonding/substrate (44%); • Average tensile bonding strength for dry-coated concrete varied from 107 to 304 psi, with bonding/substrate (58%) and concrete substrate (42%) failures; • Average tensile bonding strength for wet-coated concrete varied from 190 to 350 psi, with concrete substrate (67%) and bonding/substrate (33%) failures; • Average tensile bonding strength for dry-coated clay brick varied from 187 to 350 psi, with clay brick substrate (58%) and bonding/substrate (42%) failures; • Average tensile bonding strength for wet-coated clay brick varied from 181 to 384 psi, with clay brick substrate (58%) and bonding/substrate (42%) failures.
URLs/Downloads:
ETV PROGRAM REPORT: COATINGS FOR WASTEWATER COLLECTION SYSTEMS - PROTECTIVE LINER SYSTEMS, INC., EPOXY MASTIC, PLS-614VERIFICATION STATEMENT