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This research goes into the field application cases about Flat slab concrete divide placing construction for the Multi-purpose Apartment. It is important to investigate sufficiently when mass concrete is applied to the substituted divide placing and admixture(blast furnace slag and fly ash). In addition, it is improved on the concrete quality by the job mix design which can decrease cracks caused by the heat of hydration, by the good compactability and the substitution of admixture that can prevent segregation when concrete is poured, and by the good conditioned fluidity which makes the efficiency of building construction. After considering the stated above, the sufficient prior consideration is important for a quality Improvement plan at the field use concrete of the Mass Concrete when divide placing and admixture are substituted and applied.