Abstract
Reliable bonding between epoxy and concrete is necessary for FRP bonded concrete structures to ensure their durability. However, FRP bonded concrete structures are inevitably exposed to aqueous or saline environments, which would extremely threaten the interfacial bonding of structures. Here, the bonding properties of epoxy/hydrated calcium silicate (C-S-H) interface under aggressive environments is investigated by using molecular dynamics (MD) simulation. The configurational analysis reveals that the epoxy detaches gradually from the C-S-H surface under aqueous and saline conditions, indicating that the deterioration of the bonding between epoxy and C-S-H matrix. Simulation results show that the Caw-OC-S-H and Caw-Oepoxy connections are essential for good bonding of the epoxy/C-S-H interface. The H-bonds, formed between the epoxy and C-S-H matrix, are also not negligible for improving the interfacial bonding. In an aggressive environment, water molecules are adsorbed on the surface and become the main factor in the configurational changes. The Caw-OC-S-H, Caw-Oepoxy connection, and the H-bonds network will be weakened or destroyed under the effect of water molecules. This study could provide valuable information on the understanding the bonding degradation and configurational changes between epoxy and C-S-H matrix in different environments.
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