Rationale

The committee was made aware that many project documents specify mid-range water-reducing admixtures for concrete yet the C494 specification does not address these admixture types. After discussion, it was the decision of the committee to add a description of mid-range water-reducing admixtures via language in a Discussion line item following the definition of high-range water-reducing admixtures. Only the text in red font is being balloted. 3.2.6 water-reducing admixture, high range, n—an admixture that reduces the quantity of mixing water required to produce concrete of a given slump by 12 % or greater. 3.2.6.1 Discussion—some water-reducing admixtures, commonly called “mid-range water-reducers” can meet the requirements of a water-reducing admixture (Type A) or a high-range water-reducing admixture (Type F) by varying the admixture dosage.