The present invention relates to a concrete admixture and a method for black liquor produced from generated during the pulping more particularly, it is possible to prevent spoilage caused by bacteria on the outside by an oxidation treatment with an oxidizing agent such as ozone , hydrogen peroxide , Fenton's reagent black liquor generated during the pulping , the delay in the solidification of concrete gutji that used in admixture for concrete causing lignin , xylose (-OH) using the component oxidation Alte hydroxide (-COH), ketone (-COR) , or to induce conversion to the carboxylic group (-COOH) relates to an admixture for concrete with no condensation delayed .
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