CONCRETE RETARDER AND METHOD FOR PRODUCING THE SAME

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PROBLEM TO BE SOLVED : To provide a concrete retarder effectively reducing the time and effort on chemical synthesis and the cost of the equipment for the chemical synthesis, and to provide a method for producing the same. SOLUTION : The method for producing the concrete retarder X at least comprises an organic retarding substance-extracting step S1 for extracting an organic retarding substance ya present in an organic impurity y into an alkaline solution 1 by bringing mountain sand Y, which is an earth and sand containing the organic impurity y, into contact with the alkaline solution 1. COPYRIGHT : (C)2008, JPO&INPIT