Rationale

The committee has discussed and agreed to remove line-item 2.2 and the reference to ACI 211.1 as the old “standard practice” title has been replaced by a “guide” that is not a standard. The designation and title are: ACI PRC-211.1-22, “Selecting Proportions for Normal-Density and High-Density Concrete—Guide.” This new document should be cited in a footnote to the sentence where it is mentioned. In Specification C494/C494M, it is mentioned in 12.1. Only the text in red font is being balloted. 2.2 American Concrete Institute Standard: ACI 211.1-91 (2009) Standard Practice for Selecting Proportions, for Normal, Heavyweight, and Mass Concrete6. Proportioning of Concrete Mixtures 12.1 Proportions – Concrete shall be proportioned using ACI PRC 211.1 to conform to the requirements described in 12.1 – 12.4. After evaluation of the trial mixtures, aggregate proportions shall be adjusted as needed to obtain workable, cohesive mixtures with the correct yield to obtain the required cement contents. ACI PRC-211.1-22, Selecting Proportions for Normal-Density and High-Density Concrete—Guide provides proportioning information for developing concrete mixtures.