In bored piling the tremie pipe is lowered to the base of the bore and charged with concrete, then raised gradually as the pile fills, always keeping its end embedded. The displaced fluid rises above the concrete and is pumped away.
The volume of concrete actually placed is compared with the theoretical volume of the bore; a large over-pour points to overbreak or a cavity, an under-pour to a possible defect.
How Civova handles it
Civova records the concrete volume placed in each pile with its design and actual depth and diameter, so pour volumes can be checked pile by pile.