Damage processes: Difference between revisions

Revision as of 13:34, 1 May 2012

This article will be released soon.

@@ Line 25: / Line 25: @@
 == Phase transformation – hydration ==
-Crystal growth inside the pores can also take place during [[Hydration|hydration reactions]]. Because the phase in the higher stage of hydration has a lower density, hydration reactions increase the amount of filling of pores. This results in the the build up of [[hydration pressure]]crystals of the hydrated stage of the salt, growing against the pore wall and the build up of [[hydration pressure]]. Under unfavorable condition, cyclic hydration reactions are also possible.
+Crystal growth inside the pores can also take place during [[Hydration|hydration reactions]]. Because the phase in the higher stage of hydration has a lower density, hydration reactions increase the amount of filling of pores. This results in the the build up of [[hydration pressure]] with the growth of hydrated crystals against the pore wall. Under unfavorable conditions, cyclic hydration-dehydration changes are also possible. Again, the moisture required for the hydration reaction can originate through liquid water absorption by the material or simple condensation from increases in relative humidity.
-The moisture needed for the hydration reaction can be introduced through precipitation or condensation. Also an increase in relative humidity can be sufficient to trigger the reaction.
 == Salts and indoor climate ==