Technical guidance from the National Ready Mixed Concrete Association advising structural engineers on how to minimize prescriptive requirements and adopt performance-based alternatives in concrete project specifications. Covers ACI 318 durability exposure classes, material requirements for freeze-thaw, sulfate, and corrosion exposures, and provides a concrete material requirements table for specifying by structural member type. Emphasizes that overly conservative prescriptive specifications increase cost and can undermine sustainability goals.
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