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Invention of alternative material instead of cement is necessary. One of the objects of this research is that alkali activated slag concrete mixed with ground granulated blast furnace slag powder, ground granulated blast furnace slag fine aggregate, ground granulated blast furnace slag coarse aggregate, all by-products, and activator, is able to be used to new concrete. The other aim is to consider that curing temperature affects both the compressive strength and elastic modulus of AAS concrete.Ca(OH)2 is used as the activator used 10% of the mass of slag. Tests of slump and air content for fresh concrete are conducted and setting time of AAS paste is investigated. Specimens are stored in water at 20℃ and 40℃, respectively, for 28 days. Compressive strength of alkali activated slag concrete is surveyed at 1, 3, 7, 14, 28 and 56th day. Moreover, elastic modulus of AAS concrete at 28th day is measured. The higher curing temperature is to AAS concrete, the stronger compressive strength and elastic modulus of AAS concrete have. It is possible for the AAS concrete cured in the waster which temperature is 40℃ to use for ready mixed concrete. As a result, compressive strength tests of alkali-activated ground granulated blast furnace slag have potential as a replacement for portland cement in concrete in these days.