ABSTRACT
All Portland cement concrete used for pavement applications is ready-mix concrete. ASTM C-94AASHTO M-157 provides the standard specifications for the manufacture and delivery of freshly mixed concrete. Usually customers have a few options regarding the manner in which they can order the concrete. A performance-based option is where the customer specifies the strength, slump, and air, and the producer selects the mix proportions needed to achieve the desired performance. A prescribed option is where the customer specifies the mix proportions, whereas a combination option allows the producer to select the mix proportions with the minimum amount of cement and strength specified.
