Concrete Products

FEB 2018

Concrete Products covers the issues that attract producers of ready mixed and manufactured concrete focusing on equipment and material technology, market development and management topics.

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64 • February 2018 www.concreteproducts.com FEATURE SUPERIOR CONCRETE Mixer Systems' 1.5-yd. planetary mixer has two discharge doors and chutes, moisture probe and automatic washout system. It runs on an E-250 control, which is integrated with a color pigment dispensing system. Material handling at the Cle- burne plant encompasses a 10-ft. square hopper with 26-ton capacity to hold a full load of aggre- gate from a typical dump truck, plus two 30-ton aggregate storage bins with shuttle conveyor. Su- perior Concrete crews tooled a chute to directly feed fence forms, or charge buckets for mix trans- fer to larger product forms. PHOTOS: Mixer Systems MATERIAL HANDLING AND RECOVERY The batch equipment (right) Mixer Systems detailed for Superior Concrete's Cleburne, Texas, operation had to fit into a limited plant footprint and operate in tandem with a new mix slurry and water recovery station (below). Wisconsin-based BFK oriented the slurry dewatering system around a Model M6 Concrete Reclaimer with .5-yd. capacity Star Hopper; Model AFD Automatic Flocculant Dispenser; and, Slurry Dewatering Stand. Waste concrete or process water is washed out into the Star Hopper, where it is fed into reclaimer, which in turn delivers clean sand and rock to separate stockpiles and drains coloring agent-laden cement slurry to a collection pit. The slurry is continuously stirred and agitated via a centrifugal pump supplied with the AFD, which doses the load with an appropriate volume of flocculant. The double diaphragm pump-equipped Slurry Dewatering Stand conveys flocked slurry from the pit to a 300-gallon cone bottom poly tank. On the bottom of the cone, there is a 2-in. hand ball valve, which begins in the closed position. On the side of the cone tank is a second 2-in. hand ball valve, typically left open as a decanting port. As flocked slurry is pumped into the top of the cone tank, the heavy, flocked particles begin to fall out of the slurry stream and settle in the cone. When plant staff observe a cone full of flocked solid particles, the bottom valve is opened, allowing wet flocked slurry to discharge into a dewatering bag (suspended below the tank). The side valve is open to allow clarified water (above the solids line in the tank) to discharge into a 2,000-gal. tank supplying the reclaimer. When the flocked slurry falls, the dewatering bag captures flocked solids particles while allowing the water to pass thru. The bag hangs inside of a poly tote (bin), which contains the water draining from the bag, and discharges it thru the sidewall of the tote back to the slurry collection pond. The poly tote is equipped with a fork pocket. When the dewatering bag becomes full of solids, plant crews lift the poly tote to take the weight off of the bag straps/hooks. The poly tote may be tipped over and dumped to remove the loaded bag from the bin. The dewatering bags can be cleaned out and reused. PHOTOS: Concrete Products

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