Construction Planning and Management
Batching refers to

Weighing accurately, the quantity of each material for a job before mixing
Controlling the quantity of each material into each batch
Adjusting the water to be added in each batch according to the moisture content of the materials being mixed in the batch
Controlling the total quantity at each batch

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Construction Planning and Management
Whenever an activity has zero total float, then

Free float of the activity must be zero but independent float need not be zero
Free float and independent float both must be zero
Independent float must be zero but free float need not be zero
Free float and independent float both need not be zero

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