CEMENT ADMIXTURE COMPOSITE AND MANUFACTURING METHOD FOR THE SAME

摘要

PURPOSE: Concrete manufacturing admixture containing phosphogypsum and a method for manufacturing the same are provided to improve the durability and the compressive strength of concrete by optimally mixing amorphous kaolin and anhydrite. CONSTITUTION: Concrete manufacturing admixture includes 75-95 weight% of amorphous kaolin and 5-25 weight% of anhydrite. The content of sulfur trioxide is between 1 and 10 weight%. A method for manufacturing the concrete manufacturing admixture includes the following: Kaolin is sintered at temperature between 1000 and 1100 degrees Celsius and is cooled and dried in the water or air at temperature lower than 100 degrees Celsius in order to obtain amorphous kaolin. Phosphogypsum is sintered at temperature between 450 and 900 degrees Celsius and is slowly cooled in the air at temperature between 100 and 40 degrees Celsius. Anhydrite is obtained. The amorphous kaolin and the anhydrite are mixed and pulverized.