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One of the causes of cracked reinforced concrete in the seawater environment is direct contact between concrete and sea water. This is because cement as a binding material in concrete does not have a good ability to withstand corrosive conditions in seawater. Ground Granulated Blast Furnace Slag (GGBFS) which in this case is B3 waste can be a solution. From several studies conducted previously, the behavior of GGBFS concrete against sulfate and chloride attacks showed positive results but relatively little is known about GGBFS material produced by steel mills in Indonesia. Therefore, an experimental study of the characteristics of compressive strength and permeability test using GGBFS (0%, 20%, 30%, 40%, 50%, and 60%) with 72 concrete cylinder in 28 and 40 days. Microstructure of GGBFS concrete test using Scanning Electron Microscopy (SEM) was also studied. The result of this experimental study is GGBFS microstructure, compressive strength and concrete permeability for better effectiveness concrete in seawater, so that it can become one of the alternative solutions for infrastructure development especially for seawater infrastructure in Indonesia.