ARTIFICIAL AGGREGATE COMPOSITION FOR ENHANCING FIRE-RESISTANCE OF HIGH-STRENGTH CONCRETES, METHOD FOR PRODUCING THE SAME AND CONCRETE COMPOSITIONS USING THE SAME

摘要

An artificial aggregate composition, a preparation method thereof and a high strength concrete composition using the same are provided to obtain excellent heat-resistance and high strength in an economical process by introducing calcium phosphate, clay and lime stone in the artificial aggregate composition. An artificial aggregate composition comprises 5-10% by weight of calcium phosphate, 70-80% by weight of clay and 10-20% by weight of lime stone with respect to the weight of the powder mixture, and the lime stone comprises 50% by weight of CaO. The clay comprises 60% by weight of silicon dioxide. The artificial aggregate composition comprises 55-85 parts by weight of water with respect to 100 parts by weight of the powder mixture consisting of calcium phosphate, clay and lime stone. A preparation method of the artificial aggregate composition comprises steps of: preparing a powder mixture by mixing 5-10% by weight of calcium phosphate, 70-80% by weight of clay and 10-20% by weight of lime stone, in the proviso that the lime stone comprises 50% by weight of CaO; combining the powder mixture with water; forming the mixture into an article and drying the article; and calcining the dried article. A high strength concrete composition comprises the artificial aggregate composition. Further, a content weight of the artificial aggregate is 874 to 918 kg per 1m^3 of concrete.