A proportioned set of ingredient weights, in pounds per cubic yard or kilograms per cubic meter, built to hit a target strength, w/cm, slump and air content with local materials. The producer designs for a required average strength above the specified f'c, padded to match the plant's own test scatter, and backs the submittal with strength records or trial batches. Once approved, the mix carries an ID number that appears on every batch ticket.
Check the mix design number on the ticket, this pour is the 5,000 air-entrained mix, not the footing mix.
A wrong mix ID on the ticket is one of the most common reasons to reject a truck, so check it before the first chute swings.
Also heard as
- mix
- mix submittal
- proportioning
- mix ID
Related terms
w/cm
Water-to-cementitious-materials ratio: the weight of mix water divided by the weight of cement plus SCMs.
f'c
Symbol for specified compressive strength, the design strength the engineer requires, usually at 28 days.
Batch ticket
The delivery ticket that travels with every ready-mix truck, showing mix, quantity, time batched and water allowed.
Sack
A 94 lb bag of portland cement, used as shorthand for how much cement goes into each cubic yard.
Admixture
A product dosed into a concrete batch, usually by the ounce, to change its flow, set time, air or durability.