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Advancement of technologies in the world of construction time is very fast, the use of concrete was applied not only on land but also in the area of extremes environmental such as regional seawater. One of the ways repair structures that were popular when this is by using a material CFRP (Carbon Fiber Reinforced Polymer) which has one advantage that is resistant to corrosion. The experimental study aims to investigate the effect of seawater pitch toward the strengthening of concrete reinforced using CFRP is done by way of immersion in seawater for 3, and 6 months with the different number of laminated CFRP. The specimen consists of 36 reinforced concrete beams with dimensions (150x150x750) mm which have been reinforced with CFRP in the bending area. Flexural testing is carried out with three points of loading using displacement control method. Results of the analysis showed occur decrease the capacity of the load maximum and ductility of concrete as long soaking; both concrete normal and concrete with reinforcement. In the beam of concrete with reinforcement 1 to 2 layers CFRP increase the strength value respectively 2,54%, 9,16% but three CFRP the strength same as the normal beam. The ductility of beam with one to two layers CFRP reinforcement increase value of 42,58%, 11,8% but when using three lamination CFRP decrease 18,47% compare with beam without reinforcement. The ductility with two layers CFRP immersion therapy for 3 and 6 months value decrease of 39,13%, 35,74%, while three layers CFRP immersion for 3 and 6 months the ductility increase again 4,7% and 16,67% compare with beam without immersion. The two layers is CFRP is the best reinforcement. Failure model that occur in all beams without reinforcement fail due to flexural, and the beams with CFRP reinforcement is CDC (Critical Diagonal Crack)

The Effect of Seawater on Reinforced Concrete Beam with CFRP Lamination