Freezing and Thawing Hysteresis Effects in Experimental Analysis of Frost Deicing Salt Resistance of Cementitious Materials

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Title: Freezing and Thawing Hysteresis Effects in Experimental Analysis of Frost Deicing Salt Resistance of Cementitious Materials

Author(s): J. Kaufmann

Publication: Special Publication

Volume: 192

Issue:

Appears on pages(s): 677-692

Keywords: calorimeters; deicers; expansion; hysteresis; ice formation; ultrasonic tests

Date: 4/1/2000

Abstract:
Hysteresis effects are very frequent in experimental studies of porous building material. In the case of frost deicing salt resistance, hysteresis effects between freezing and thawing were reported in calorimetric and expansion experiments. They often were explained by a difference in the active pore diameter. However, our calorimetric and ultrasonic pulse velocity measurement show much smaller hysteresis effects which support another explanation: supercooling. A model based on non-connected pore water which may supercooling. A model based on non-connected pore water which may supercool was developed to explain the experimental differences. This model allows a reinterpretation of experimental expansion data. The moment of damage formation in frost deicing salt resistance tests can be studied. The analysis of the causes of hysteresis effects therefore leads to improved models of frost deicing salt damage mechanisms.