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ASTM C231 - Air Content of Concrete by the Pressure Method
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ACI Density Test: ASTM C138 Density (Unit Weight) 2019
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ASTM C31 Making and Curing Concrete Test Specimens in the Field
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What to Expect When You're Inspecting, Part I
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ASTM C138-Unit weight of concrete and C231-Air content via pressure air meter
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ASTM C138 Standard Test Method for Density (Unit Weight), Yield, and Air Content of Concrete
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