Layer Thickness

Try to place concrete in even horizontal layers. Do not attempt to puddle or vibrate it into the form. To prevent honeycombing and voids, place each layer in one operation and consolidate it before placing the next layer. This is particularly critical in wall forms containing considerable reinforcement. Use a mechanical vibrator or a hand spading tool for consolidation. Take care not to over vibrate. This can cause segregation and a weak surface. Do not allow the first layer to take its initial set before adding the next layer. Layer thickness depends on the type of construction, the width of the space between forms, and the amount of reinforcement.