Underwater adhesion of polymethyl methacrylate concretes to reinforcing steel (reinforcing bars)

In this research work, polymethyl methacrylate (PMMA) concretes are prepare d and tested for bond strength through the pullout of vertically embedded r einforcing bars in PMMA concretes. The specimens are placed underwater at 2 0 C and in air at 20 C and 50 Percent relative humidity (RH) for 1, 3, 7, a nd 28 days. To improve the bond strength of PMMA concretes to the reinforci ng bars embedded underwater, a silane coupling agent is added to PMMA binde rs. To prevent the formation of rust on the reinforcing bars and effectivel y improve the bond strength between PMMA concretes and reinforcing bars wit h the silane coupling agent in underwater construction work, the use of the reinforcing bars coated by three types of processes is examined. As a resu lt, a significant improvement in the bond strength between PMMA concretes a nd reinforcing bars with silane coupling agent embedded underwater is achie ved, and the renting of the reinforcing bars with a PMMA binder before PMMA concrete placement is recommended to prevent the formation of rust on rein forcing bars.