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This paper investigates the strength properties of ground granulated blast furnace slag(GGBFS) with magnesium sulfate(MgSO4). GGBFS was replaced with 1, 2, 3, 4, and 5% MgSO4 by weight. Mixtures of sodium hydroxide(NaOH) and sodium silicate(Na2SiO3) were used as the alkaline activator; a mixture of 5% NaOH and 5% Na2SiO3, and a mixture of 10% NaOH and 10% Na2SiO3 by slag weight. The added activators were dissolved in the water, and the weight ratio of water to slag was 0.45. This study was performed using compressive strength testing, ultrasonic pulse velocity(UPV), water absorption and X-ray diffraction(XRD). In this study, the strength of hardened samples decreases with increasing MgSO4 content. In addition, the water absorption of samples increases and UPV decreases, with the increase of MgSO4 content. Brucite, gypsum and M-S-H(magnesium silicate hydrate) are present in the XRD patterns of the hardened samples.
