Self consolidating concrete for precast prestressed concrete bridge elements
Consider the change in air content when determining specification compliance.
If you find that the air drops by 0.3%, subtract that from the reading at the truck.
(Sec 501.3.2) Optimized mix designs may have a reduction in cement of 0.5 sack per cubic yard from the table shown in Sec 501.3.6 of the Standard Specifications.
If cement is reduced, the mixture may be subject to review and approval by the engineer.
Ordinarily the most representative sample will be taken at the point of final discharge.
For safety reasons, however, it is not always practical to do so.
Optimized refers to a well graded combined aggregate gradation resulting in lower water demand, improved workability, and improved finishing characteristics.
Aggregate suppliers will be designated in Site Manager.
The contractor shall design and submit all concrete mixes to District Materials for review and approval.
If you are on the low side at the truck the air should be adjusted accordingly.
The correction factor from loss through pumping would also apply to the slump.