Cast-in-place architectural concrete usually requires a mix which has very good workability. Proper vibration will reduce the risk of air bubbles, honeycombing, and surface blemishes. Architectural concrete should be placed using a pump and an elephant trunk to avoid mix separation splatter and trapped air. Most form liners cannot withstand a pour rate in excess of 4 to 5 feet per hour. Generally, the more texture and relief on the form liner, the slower the concrete must be placed. If a plasticizer is used, the rate of pour may have to be reduced to limit form pressures.
In placing concrete for tilt-ups, make sure that all joints are sealed and/or taped and avoid stepping on the form liner as much as possible. All dirt, debris, and water should be removed before placing concrete. Follow ACI recommendations for the vibration of the concrete.
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