Accelerated performance evaluation of repair mortars for concrete sewer pipes subjected to sulfuric acid attack

Abstract

Hydrogen sulfide (H2S) gas is generated from sewage and wastewater, which corrodes concrete sewer pipes and shortens their service life. Therefore, concrete sewer pipes that are vulnerable to corrosion damage caused by sewage and wastewater microorganisms require materials that have high acid resistance for effective repair, and management. In particular, high acid resistance is required at the interface between the concrete and repair mortar in the event of partial repair. In this study, a repair mortar, applicable for partially repairing concrete sewer pipes, was developed, and accelerated tests were performed to assess the sulfur resistance performance of the prepared repair mortar. Specimens were fabricated to simulate the partial repair of actual sewer pipes, and three types of accelerated tests were performed. The results confirmed that resin powder improves the sulfur resistance, and fibers improve the freeze–thaw resistance of the developed repair mortar.

Keywords

• Concrete sewer
• Repair mortar
• Sulfur resistance
• Accelerated test
• Degradation