Comparative study on the surface treatment for marine structure rehabilitation with glass Fiber-Reinforced high strength Self-Compacting mortar

Abstract

Rehabilitation method plays an important role in maintenance process of the structure in general and the marine structure in particular. This paper aims to present a comparative study on the surface treatment for marine structure rehabilitation with glass fiber-reinforced high strength self-compacting mortar or SCM. Three types of rehabilitation methods in terms of surface treatment are as-cast surface, surface prepared with steel brush and surface with hole-connector. The experimental results showed that flexural strength of rehabilitated beam with as-cast surface, surface prepared with steel brush, and surface with hole-connector has improved 22%, 31% and 4% respectively higher than that of non-rehabilitated one. The precracked rehabilitated beams had load-carry capacity, for the case of as-cast surface, surface prepared with steel brush, and surface with hole-connector, their flexural strength were 41%, 37% and 31% respectively that of the corresponding non-precracked beams. Visual observation of the non-rehabilitated and rehabilitated beam cross-section after the third-point bending test revealed that their failure mode was similar. Besides, regarding the rehabilitated beams, there is no crack between conventional concrete and SCM.