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4. ASTM C173/C173M-16, 2016. Standard Test Method for Air Content of Freshly Mixed Concrete by the Volumetric Method, ASTM International, West Conshohocken, PA, USA, p. 9.
5. ASTM C457/C457M-16, 2016. Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete, ASTM International, West Conshohocken, PA, USA, p. 18.