): Selecting the ratio required for both target strength and durability (e.g., exposure to sulfates or freezing).
The mix must be designed for a strength higher than the specified strength ($f'c$) to account for variability. aci 211.1-22
Assume: Required strength 4,000 psi, 1" Aggregate, 3" Slump, Non-air-entrained. ): Selecting the ratio required for both target