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ASTM C666 – Standard Test Method for Resistance of Concrete to Rapid Freezing and Thawing


ASTM C666 is a standard test method used to evaluate the resistance of concrete specimens to repeated cycles of freezing and thawing. This test is essential for assessing the durability of concrete, particularly in environments with harsh winter conditions where concrete is exposed to repeated freeze-thaw cycles.

The standard outlines two procedures for conducting this test:

  • Procedure A: rapid freezing and thawing in water
  • Procedure B: rapid freezing in air and thawing in water

Both procedures involve subjecting concrete specimens to a predetermined number of freeze-thaw cycles and then evaluating the changes in their properties, such as mass loss, length change, relative dynamic modulus of elasticity, and appearance.

Key aspects of ASTM C666:

  • Purpose: to determine the freeze-thaw resistance of concrete.
  • Applicability: it applies to concrete used in various applications, including pavements, bridges, and buildings.
  • Specimen preparation: the standard provides detailed guidelines for preparing and conditioning the concrete specimens before testing.
  • Test conditions: it specifies the temperature and duration for each freeze-thaw cycle, as well as the number of cycles to be performed.
  • Evaluation: it describes the methods for evaluating the changes in the specimen properties after testing.
  • Reporting: it outlines the requirements for reporting the test results.

By following the procedures in ASTM C666, engineers and researchers can reliably assess the freeze-thaw resistance of concrete and select appropriate materials and mix designs for durable concrete structures in cold climates.

ASTM C666 Accredited Laboratory

Applied Testing & Geosciences, LLC is accredited for performing tests using the ASTM C666 standard.

Contact us for more information.



freeze-thaw resistance; concrete; rapid freezing; thawing; durability; scaling; mass loss; relative dynamic modulus of elasticity; RDME