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The purpose of this study is to investigate the alkali-silica reaction through the addition of reactive aggregate in the alkali-activated geopolymer mortar mixed with copper slag, as well as the mechanical properties and ASR reactions. As a binder for geopolymer mortar, a unary and binary combination of fly ash, ground granulated blast furnace slag, and copper slag was carried out. Table flow, bending strength, and compressive strength of geopolymer mortar were tested according to the mixing characteristics. In addition ASR expansion experiments and AEW measurements were performed. As a result of the experiment, the table flow increased as the mixing rate of copper slag increased. The binary mortar of fly ash and copper slag was generally lower in strength than ordinary portland cement, but all specimens of ground granulated blast furnace slag and copper slag were higher in strength than ordinary portland cement. As a result of the ASR expansion experiment, all binary mortar specimens showed an expansion rate of less than 0.1% as specified in ASTM C 1260. As a result of AEW measurement, copper slag was the highest when using a unary binder, and the binary mortar mixed with ground granulated blast furnace slag was lower than the binary mortar mixed with fly ash. Based on the previous results, when manufacturing copper slag geopolymer mortar, a binary system using a mixture of copper slag and ground granulated furnace slag is considered advantageous.