It has been well known that concrete structures exposed to chloride and sulfate attack environments lead to significant deterioration in their durability due to chloride ion and sulfate ion attack. The purpose of this experimental research is to evaluate the resistance against chloride ion and sulfate attack of the cementless concrete replacing the cement with ground granulated blast furnace slag. For this purpose, the cementless concrete specimens were made for water-binder ratios of 40%, 45%, and 50%, respectively and then this specimens were cured in the water of 20±3℃ and immersed in fresh water, 10% sodium sulfate solution for 28 and 91 days, respectively. To evaluate the resistance to chloride ion and sulfate attack for the cementless concrete specimens, the diffusion coefficient for chloride ion and compressive strength ratio, mass change ratio, and length change ratio were measured according to the NT BUILD 492 and JSTM C 7401, respectively. It was observed from the test results that the resistance against chloride ion and sulfate attack of the cemetntless concrete were comparatively largely increased than those of OPC concrete with decreasing water-binder ratio.

The purpose of this experimental research is to evaluate the long-term resistance against sulfate attack of the alkali activated cementless concrete replacing the cement with ground granulated blast furnace slag. For this purpose, the cementless concrete specimens were made for water-binder ratios of 40%, 45%, and 50%, respectively and then this specimens were immersed in fresh water and 10% sodium sulfate solution for 28, 91, 182, and 365 days, respectively. To evaluate the long-term resistance to sulfate attack for the cementless concrete specimens, compressive strength ratio, mass change ratio, and length change ratio were measured according to the JSTM C 7401. It was observed from the test results that the resistance against sulfate attack of the cemetntless concrete was comparatively largely increased than that of OPC concrete irrespective of water-binder ratio.