Behavior of Concrete Columns Repaired with Polymer Mortar and Epoxy Fiber Panel

Abstract

Underwater structures are not easy to check for the degree of damage or to repair and strengthen damaged regions. Even during repair and strengthening, quality control is very difficult, because the work is done under water. Moreover, underwater structures severely deteriorate, owing to special environmental conditions. If this deterioration continues, the structures face serious structural problems, because of the corrosion of steel rods and the loss of concrete sections. Repairing or strengthening underwater structures requires effective, economic underwater repair and reinforcement techniques that allow the same working conditions as on the ground while maintaining dry condition for the repair sections. However, systematic studies on the repair and strengthening techniques for underwater structures are insufficient. This study proposes a new repair method for underwater structures, which applies epoxy fiber panel forms and shear connectors. To demonstrate the repair effects, this study compared and evaluated the failure modes and repair effects by the surface condition of repair sections, by applying various repair methods, in consideration of the ground and underwater conditions.

Effects of Aggregate Gradation on the Physical Properties of Semiflexible Pavement

“…Materials like polymers may also be introduced into the composition. According to Hong and Park [14], incorporation of polymers does not only help in the increment of strength and reduction of bleeding and shrinkage, it also gave a drawback to the composition where it contributes to the cohesiveness of the fresh grout composition.…”

Investigation and Practical Application of Silica Nanoparticles Composite Underwater Repairing Materials

“…Repairs of the underwater concrete structures are complicated construction works due to the constant dynamic action of water on these structures. It has been reported that a material used to repair concrete cracks in dry conditions is invalid in the underwater condition since it often fails to bond to the damaged concrete and adverse effects can occur with the reaction between the hardener and the water [25,26]. For example, the curing agent in epoxy mortar reacts with water and carbon dioxide, which leads to a sharp decrease in bond strength [27].…”