Performance of spray-applied epoxy lining system subject to infiltration

•Sprayed-in repair technique for deteriorated concrete infrastructure subject to infiltration.•Alternative technique to cured-in-place techniques.•System resists over 2700 kPa hydrostatic infiltration forces.•System resists over 800 kPa sustained hydrostatic infiltration force without creep.•System mitigates effects of large flaws and may installed in wet conditions.

This study focuses on a bonded repair technique for deteriorated concrete infrastructure located below the water table. A spray-applied lining system is a monolithic system applied to the inside of a concrete structure, such as a pipe, culvert or tank, sealing the structure and mitigating limit states associated with structural deterioration, corrosion and/or infiltration. The resulting lining is a thin, durable, chemical resistant product that is intimately and permanently bonded to the host structure. An experimental program utilising hydrostatic pressure, intended to mimic hydrostatic forces driving infiltration into a cracked concrete pipe, was conducted. Parameters considered in the study include concrete flaw size, epoxy thickness and concrete surface preparation. Results indicate that the performance of the spray-applied epoxy system is governed primarily by host concrete tensile strength and epoxy shear capacity. The proposed system represents a feasible alternative for the repair of concrete infrastructure, including large diameter pipe, subject to large hydrostatic infiltration forces.