PRODUCTION OF ARTIFICIAL AGGREGATE FROM COAL ASH, ARTIFICIAL AGGREGATE AND CONCRETE USING THE AGGREGATE

摘要

PURPOSE:To attain an artificial aggregate capable of being used in the plain concrete aggregate for civil engineering and construction and to obtain a concrete for civil engineering and construction having necessary and sufficient compressive strength, tensile strength and modulus of static elasticity. CONSTITUTION:Coal ash is regulated so that >=80% of the ash consists of >=20% of grains having <6mum size, 40-60% of grains having 6-24mum size and >=30% of grains having 24-44mum size. A caking material and water are added to the coal ash, the mixture is granulated, and the granulated material is calcined to form an artificial aggregate having >=2.0 absolute dry sp.gr., <=3.0% water absorption and >=400kg/cm<2> compressive strength, and a concrete for civil engineering and construction is prepared with the artificial aggregate as the concrete aggregate.