For the contractor looking for ways to increase his share of the market in building livestock confinement feeding facilities, cast-in-place concrete slotted floors can be offered as an economical alternative to precast slotted floors. The cast-in-place floors offer the traditional advantages of concrete strength, durability, fire-protection, and economy; and delays or time lags in precast shipments are eliminated.
Forms for the slots are usually fabricated of sheet metal or extruded metal, but glass fiber reinforced plastic is also suitable. By attaching these slot forms to plywood sheets, slots can be placed in the floor at any interval desired quickly and accurately. The plywood sheets are then supported between beams and outside walls for placing concrete. Each concrete slat in the slotted floor is reinforced with steel. The size of the bars depend on the load carried by the floor, the span length of the slat and the depth of the slat.
The concrete should be workable, durable, and have a rapid strength gain, so forms can be stripped and reused the day after placement. Concrete must be worked around reinforcement and thoroughly compacted. After placement the concrete is struck-off and finished flush with the tops of the slot forms. The top surface of the slats is given a dense, gritty texture that provides good footing without causing sore feet for the livestock. As soon as the slab finishing is done, the concrete should be covered or sealed to prevent loss of moisture. This will reduce shrinking and cracking and improve durability of the floor.