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ASTM C31 Standard Practice for Making and Curing Concrete Test Specimens in the Field

Overview of ASTM C31 - Standard Practice for Making and Curing Concrete Test Specimens in the Field This is a test required to pass the American Concrete Institute (ACI) Field Technician Certification Program -- "Concrete Field Testing Technician—Grade I." A Concrete Field Testing Technician—Grade I is an individual who has demonstrated the knowledge and ability to properly perform and record the results of seven basic field tests on freshly mixed concrete. The program requires a working knowledge of the following ASTM test methods and practices: ● C1064/C1064M - Temperature of Freshly Mixed Hydraulic-Cement Concrete ● C172 - Sampling Freshly Mixed Concrete ● C143/C143M - Slump of Hydraulic-Cement Concrete ● C138/C138M - Density (Unit Weight), Yield, and Air Content (Gravimetric) of Concrete ● C231 - Air Content of Freshly Mixed Concrete by the Pressure Method ● C173/C173M - Air Content of Freshly Mixed Concrete by the Volumetric Method