ASTM C09 revises C94 batch water accuracy target

Source: National Ready Mixed Concrete Association, Alexandria, Va. 

A revision reflected in the forthcoming ASTM C94/94M-21a, Standard Specification for Ready-Mixed Concrete eases batch water volume verification during the batching process. It requires water to be batched to an accuracy of ±1.5 percent of the target batch water versus two existing accuracy thresholds: batch water to ±1 percent of total mixing water, which in turn should be within ±3 percent of mixing water per the mix design. The ±1.5 percent threshold abides the National Ready Mixed Concrete Association Plant Certification checklist.

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