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Failure of concrete in the environment which containing sulphate causes damage to the cement bonds in the concrete. One of environment that contains sulphate is peatlands. Peat water has a low acidity (pH) and causes the water to be acidic. The acidic environment will slowly damage the concrete starting from the edges and corners of the concrete with the release of granules of concrete particles so that the concrete becomes porous. To reduce the damage, used mineral additives in the form of Ground Granulated Blast Furnace Slag (GGBFS) on Type II Cement. The purpose of this research was to determine the effect of using variations of GGBFS as an additives on Portland Cement Type II on compressive strength of high quality concrete and the optimum variation percentage using GGBFS as additives on Portland Cement Type II. This research outlines divided into several stages, i.e. material testing, manufacturing of test specimens, testing of test specimens and analysing test results. This research used a cylindrical specimen with 4 variations of the mixture that is normal concrete, concrete with the addition of 2 % ,4%, and 6% GGBFS by the weight of cement with a concrete age of 7, 14, and 28 days. Also, the treatment of specimens is carried out using peat water. From the results of this research, it can be concluded that the effect of using a GGBFS addition as an additives can increase the compressive strength of concrete from normal concrete, however it decreases with the addition of 2% GGBFS and 6% GGBFS at the age of 7 days amounting to -14.62 % and -3.47 %. The optimum variation percentage is concrete with the addition of 4% GGBFS which produces compressive strength of 40.90 MPa and the minimum variation is concrete with the addition of 0 % (normal concrete) which produces compressive strength of 33.82Mpa.