ASTM C666/C666M-15 PDF Download

The ASTM C666/C666M-15 standard provides two procedures (Procedure A and Procedure B) for determining the resistance of concrete to cycles of freezing and thawing in the laboratory.

The purpose of this standard is to evaluate the effects of variations in concrete properties and conditioning on its resistance to freezing and thawing cycles. It is commonly used in applications such as specifying the use of concrete in construction projects, assessing the durability of coarse aggregates, and determining the soundness of aggregates that may affect concrete freeze-thaw durability.

The standard assumes that the procedures will not substantially damage frost-resistant concrete, defined as concrete that is not critically saturated with water and has an adequate air-void system to prevent critical saturation under normal conditions. If the concrete is found to be relatively unaffected by the performance tests, it can be assumed that it was either not critically saturated or made with sound aggregates and a proper air-void system.

The standard also mentions that there is no established relationship between resistance to freezing and thawing of specimens cut from hardened concrete and specimens prepared in the laboratory. Additionally, it provides no specific guidance on choosing between Procedure A and Procedure B, except when specified in a particular application. Procedure A is considered more aggressive and better at revealing defective materials, while Procedure B is seen as more representative of saturation patterns in some field applications.