ABSTRACT
The practice of developing high-strength concrete capable of satisfying needed constructability and serviceability requirements with reasonable economy involves both art and science. Concrete proportioning should not be thought of as a process of selecting tabulated values based on empirical relationships. Concrete proportioning requires cognizant thought processes, particularly when designing mixtures that approach or exceed the limits of the method being used. Empirically-based proportioning methods can be quite useful, but an awareness of their limitations is essential.
