ASTM C231/C231M is the ASTM standard for the pressure method used to determine the air content of freshly mixed concrete. It provides a common technical basis for evaluating concrete while it is still in its plastic state, helping users confirm whether the mix meets project expectations. Because air content can affect performance and consistency, this standard is often referenced in quality control, acceptance testing, and field verification for concrete work.

Overview of ASTM C231/C231M

As the Standard Test Method for Air Content of Freshly Mixed Concrete by the Pressure Method, this document describes a recognized approach for measuring air in fresh concrete using pressure-based testing. ASTM C231/C231M is commonly used when a repeatable, field-ready method is needed to assess mixture condition before placement. It serves as a technical reference for testing procedures tied to concrete evaluation and helps align practice with ASTM requirements for consistent results.

Common use cases of ASTM C231/C231M

This standard is commonly used during concrete production, site delivery, and placement when fresh concrete needs to be checked for air content. It is relevant to field technicians, quality control teams, and testing programs that monitor concrete before it hardens. ASTM C231/C231M is often selected for routine verification of fresh concrete properties, especially when pressure-method testing is part of the project specification or internal quality process.

Benefits of using ASTM C231/C231M

Using ASTM C231/C231M helps support consistent air-content testing and gives purchasers, contractors, and laboratories a shared reference for compliance. It can reduce uncertainty in acceptance decisions by providing a standard method for evaluating freshly mixed concrete. This is useful for quality control, documentation, and comparison across batches or projects. As a recognized ASTM standard, it also supports more reliable communication between suppliers, testers, and specifiers.

• Pressure method for fresh concrete
• Field-oriented air content testing
• Quality control and acceptance support
• Useful for routine concrete verification