Determination of resistance to freezing and thawing

The resistance to freezing and thawing test provides information about the behaviour of an aggregate subjected to the cyclic action of freezing and thawing. The test is usually conducted in countries having subzero temperatures. 

The test according to CEN EN 1367-1 (2007) is conducted on aggregate particles from 4 to 63 mm. 

A predefined mass of dry aggregate is first immersed in a water bath at 20 C 5 C for 24 h and is then subjected to gradual freezing to -20 C for a predefined period. The sample is then thawed at 20 C 3°C. This freezing and thawing procedure is repeated 10 times. 

The sample is then sieved through a sieve smaller than that used to determine the test sample (half the lower size sieve used). The loss of weight due to freezing and thawing is recorded and expressed as a percentage of the initial mass of the test sample. The representative freezing and thawing value is the mean of three test values. 

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Part 1 Determination of resistance to freezing and thawing Part 2 Magnesium sulfate test... 

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