METHOD FOR RECLAIMING CONCRETE WASTE AND APPARATUS THEREFOR

摘要

PURPOSE:To treat and recover waste concrete in a large amount by separating contaminating foreign materials from roughly crushed demolished concrete wastes, then peeling and separating cement hydrate and sieving the separated hydrate. CONSTITUTION:Demolished concrete wastes are roughly crushed to 20-100 mm size and contaminating foreign materials such as reinforcing rods or wood pieces are sorted and separated. The resultant wastes are then charged from a charging port 17 into a clearance between a rotating roller 11 eccentric with an extent of eccentricity (C) and an outer liner 16 in a casing 10 of a disintegrator 1. The roller 11 is rotated through a crusher motor 12, a V-belt 13, a pulley 14 and a main spindle 15 to disintegrate the concrete wastes. The disintegrated wastes are subsequently separated into a coarse aggregate and a fine aggregate. The obtained fine aggregate is then discharged from a discharge port 18 onto a conveyor 19, fed from a raw material charging port 20 into a rotating drum 2 provided with plural scraping plates 22 on the periphery thereof and concentric weirs 23 installed at the terminal thereof and separated into the fine aggregate and cement hydrate. The cement hydrate passing through a grate 24 with air fed from an air port 21 is discharged through a discharge part 26 and a fine powder discharge port 27. The fine aggregate is then discharged from a fine aggregate taking outlet 28.