The ability to assess with confidence the potential freezing and thawing durability of concrete is important for long-term evaluations of mix designs and of in-situ concrete.
Test Method for Resistance of Concrete to Rapid Freezing and Thawing (ASTM C 666). Procedure A, which is the subject of this investigation, was designed to provide an indication of the potential freezing and thawing durability of concrete in a freezing and thawing environment. It provides a relative assessment of the frost resistance of the concrete after a given number of freeze-thaw cycles, compared to the initial condition of the specimens.
The principal objective of this investigation was to examine the use of control specimens to improve the interpretation of test data. At each test age, the control specimens are tested and these values used in the calculation of the relative dynamic modulus and weight change.
The control specimens allow the effects of the deterioration process to be separated from the changes in the internal structure due to the hydration process as measured by the transverse frequency. They provide a continuous reference for the test specimens, giving a before and after picture for visual assessment such as scaling.
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