Concrete Products

SEP 2015

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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38 • September 2015 www.concreteproducts.com As the panel moves further down the automatic conveyer system, the first layer of steel reinforcement is lowered by a worker-controlled crane into the panel form mock-up. The new- ly formed panel with reinforcement in place next arrives at the concrete spreader. The Molin line runs a batch plant from Standley Batch Sys- tems, Inc. It utilizes a weigh batching system and mixer; sand and aggregates are contained in 12 bins with 18 compartments. There are four silos for cement: two for gray cement, one of white cement, and one for fly ash. Hanging from an overhead gantry, the spreader slides back and forth depositing concrete in the appropriate areas. Material is dispatched from the nearby computerized batch plant with a color pigment system and multiple aggregate bins for consis- tent batching of architectural mixes. The system automatically sends the correct type and amount of concrete mix to form the concrete panel. A second gantry-hung tool screeds the concrete and the panel is moved along to the curing chamber. If the panel is to be a double wall with interior and exte- rior concrete wythes sandwiching a layer of insulation, the spreader will first pour the face mix to a prescribed thickness. The panel assembly is rerouted to a station where insulation is applied along with further reinforcement, and then it is run through the concrete spreader a second time for placement of the gray base mix. Insulated panels can obtain R-values as high as 23.0 with 4 inches of extruded polystyrene. Most panel fin- ishes, including sandblast, exposed aggregate, hard trowel and broom, will be machine applied—providing unmatched consis- tency. Thin Brick and Formliner finishes will also be available. FEATURE PRECAST/PRESTRESSED With 3-yd. and 2-yd. output on three-minute cycles, the Rapid RP 3000 and RP 1500 planetary mixers bearing on the batch plant mezzanine have combined capacity of 800 yd. per shift. Each has two pneumatic dis- charge doors, mixer soft start, auto lube system and cylinder air control box. They supply all structural gray and colored architectural concrete needs for the Ramsey line. Standley Batch Systems supplied the Rapid models as part of a package in- cluding 12 70-ton aggregate bins, equipped with Hydronix moisture probes. Four bins plus a 12-ft. square truck dump hopper are heated. Inbound aggre- gate are fed by a steep, pocket belt conveyor (top right) to a shuttle hovering the bins, each of which has weigh scale batchers charging collection belts charging the mixers. Standley Batch designed the plant with 98-ton and 86-ton split cement silos.

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