In this study, an experiment was conducted to reduce carbon dioxide emission which is the main cause of global warming in the construction industry. Blast furnace slag is used to replace cement that emits a large amount of carbon dioxide in the manufacturing process, and alkaline water was electrolyzed with potassium carbonate (K2CO3) as an electrolyte instead of an alkali activator to solve the problem of deterioration of initial strength and neutralization resistance of blast furnace slag. In other words, a series of experimental studies were conducted to reduce the amount of cement used by analyzing the compressive strength, micro structure analysis and neutralization test of concrete using blast furnace slag and electrolysis alkaline water. As a result, the compressive strength of mortar using alkaline water as the mixing water showed higher strength improvement than the mortar using general mixing water, and as a result of SEM analysis, more hydration products were generated inside the mortar test specimen using alkaline water as the mixing water. This is judged to be(by) the destruction of the glassy film through alkaline water and the elution of reactive substances from the blast furnace slag. In addition, as a result of the accelerated carbonation test, it was confirmed that the mortar using alkaline water as the mixing water had higher carbonation resistance than the mortar using general mixing water.