Study on Properties of Epoxy Resin Curing System for Marine Concrete Structures

With the rapid development of marine economy, the demand for marine concrete structure corrosion repairing and reinforcement technology is increasing. The existing repair technology of concrete structures above ground level is very mature. The applicability of epoxy resin curing system to the marine environment is the key issue to expand its application environment from the ground surface engineering to the offshore engineering. In this paper, 7 kinds of commercial curing agents are selected and screened by curing agent, viscosity of resin system and underwater gel time. The effects of curing environment and time and dosage of curing agent on compression properties of the resin system are studied. Finally, through the study of tensile properties and bond properties, it is concluded that the 810 curing agent has the best comprehensive performance in seawater environment. The results show that when the mass ratio of the epoxy resin E51 to the curing agent 810 is 2∶1, the epoxy resin is placed in seawater cured for 7 d, and the underwater gel time is 65 min, the compressive strength of the epoxy resin is 101.59 MPa, the tensile strength 32.59 MPa, the elongation at break 4.09%, and the bond strength 3.52 MPa.