ASTM InternationalASTM C231Test Method for Air Content of Freshly Mixed Concrete by the Pressure Method.Referenced across 5 Anvilfield field guides. Field guides that apply ASTM C231ConcreteConcreteCold weather concretingConcreteConcrete slump testConcreteHot weather concretingConcreteMix design and water-cement ratioDatacenterDatacenterData center structural QA Often cited alongsideACI 301ACI 318ASTM C31ASTM C39ASTM C1064ASTM C143ASTM C173ASTM C138 Browse all codes and standards