Mechanical degradation of normal concrete due to seawater intrusion

Problems that occur in concrete buildings in the coastal environment of concrete damage caused by degradation of concrete that interacted seawater. Real damage caused by seawater, consists of 3 (three) parts: submerged concrete part, concrete part affected by tidal seawater and part of the concrete affected by seawater splashing. The concrete damage discussed in this research is the mechanical degradation of concrete due to the intrusion of seawater in the submerged seawater. Damage can occur in concrete due to the reaction between aggressive seawater that is intruded into the concrete and compounds in the concrete that causes the concrete lose some of its mass, its strength, and stiffness and also accelerate the weathering process. The results of this study indicate that the reduction of compressive strength of concrete due to the intrusion of seawater tends to show a logarithmic graph. Concrete compressive strength will lose by 50% when the concrete is soaked seawater for 19,031 days. Normal quality concrete f'c = 25 MPa undergoes mechanical degradation due to seawater intrusion, in this case, the compressive strength of concrete is 12,063 % when soaked 28 days and 16,809 % when soaked 90 days.