How can you tell if you 're getting the amount of concrete you 're paying for ?

The real indicator is the yield , or the actual volume produced based on the actual batch quantities of cement , water and aggregates  . The unit weight test can be used to determine the yield of a sample of the ready mixed concrete as delivered  . It's a simple calculation that requires the unit weight of all materials batched . The total weight information may be shown on the delivery ticket or it can be provided by the producer . Many concrete producers actually over yield by about 1/2 percent to make sure they aren't short - changing their customers . But other producers may not even realize that a mix designed for one cubic yard might only produce 26.5 cubic feet or 98 percent of what they designed .