Damage processes: Difference between revisions

Revision as of 13:16, 1 May 2012

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 == Introduction ==
-Salts play a central role in the weathering of porous building materials. Salt damage is always the result of phase transformations in the pore space and the associated crystal growth. In the pore space the enclosed, expanding crystals can build up pressures, that exceed the mechanical strength of many materials and thus cause their failure. Considerable progress in understanding the actual  [[Deterioration Mechanisms|deterioration mechanism]] caused by crystal growth, has been achieved in recent years. Regardless of the mechanism, an exact knowledge of the conditions causing the unwanted phase transformation, is crucial for the development of suitable strategies to prevent the damage.
+Salts play a key role in the weathering of porous building materials. Salt damage results from phase transformations in the pore space and the associated crystal growth. In the pore space, the enclosed and growing crystals can build up pressures that exceed the mechanical strength of the material in question thus causing their failure. Considerable progress in understanding the actual [[Deterioration Mechanisms|deterioration mechanism]] caused by crystal growth has been achieved in recent years. Regardless of the mechanism, an exact knowledge of the conditions causing the unwanted phase transformation, is crucial for the development of suitable strategies to prevent the damage.
 == Phase transformation – crystallization ==