Proportioning Normal Concrete Mixtures ACI Guidelines of Mix Design Designing a concrete mix is to determine the most economical and practical combination of the available materials to produce a concrete that will satisfy some performance requirements under certain conditions of use. The properly proportioned concrete mix should have the following: 1. Acceptable workability for the job 2. Durability, strength and uniform appearance of hardened concrete 3. Economy It should be clear that understanding the principles of mix design is more important than conducting the actual calculations.
Step 1. Choice of slump See Table A1.5.3.1.