PRODUCTION OF ARTIFICIAL LIGHTWEIGHT CONCRETE AGGREGATE FOR STRUCTURAL PURPOSE BY APPLICATION OF ORGANIC AND INORGANIC WASTE MATERIAL

摘要

PURPOSE: To form the concrete aggregate by mixing fine powder essentially consisting of limestone and chalk, and pulverized powder of org. and inorg. waste, adding sodium silicate to the mixture, and kneading and molding the mixture, then calcining the molding at a low temp. ;CONSTITUTION: The fine powder (A) of the limestone, chalk, clayey limestone, siliceous limestone, etc., essentially consisting of CaCO₃ and the powder (B) formed by pulverizing the inorg. waste, such as glass/metal mixture are charged into a mixer in an A/B=2/1 to 1/2 range by weight to prepare a powder mixture (C). An aq. sodium silicate soln. (D) diluted twice is then added to the powder mixture in a C/D=2/1 to 1/1 range by weight. This powder mixture is dried by heating and is then discharged in a half molten state. The discharged matter is divided by a cutting machine, etc., and after the grain sizes are unified, the grains are molded to a spherical shape under pressurization. The molding is then calcined for 30 to 60 minutes at 300 to 500°C in a calcination furnace, by which the artificial lightweight concrete aggregate for structural purposes is obtd.;COPYRIGHT: (C)1993,JPO&Japio