To resolve problems wherein, research and development of ready-mixed concrete aim at curing concrete and cement technology development of an admixture shortening or delaying a coagulation time of a cement component in ready-mixed concrete, controlling of curing time by changing a blending ratio of the cement main components, according to the usage of cement, is advanced, while search on concrete with no ready-mixed concrete cured, cement components difficult to coagulate by hydration reaction have not been proceeded.

Water is added to ready-mixed concrete to form slurry-like ready-mixed concrete, carbon dioxide is mixed thereinto and agitated to change lime in the cement component into calcium carbonate, thus recycling it as a stable concrete material causing no coagulation.

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