Architectural Ceramics: Difference between revisions

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Image:Per 270603 5-13 15.jpg|Figure 3: Photo micrograph as Fig 2 with crossed polars. It is clearly visible that the gypsum is causing the damage to the brick, however, it also serves as filler, holding the flaking pieces in place. If the gypsum would be removed, the original surface of the brick would be lost.</gallery>
Image:Per 270603 5-13 15.jpg|Figure 3: Photo micrograph as Fig 2 with crossed polars. It is clearly visible that the gypsum is causing the damage to the brick, however, it also serves as filler, holding the flaking pieces in place. If the gypsum would be removed, the original surface of the brick would be lost.</gallery>


===Weathering ===
===Powdering ===


<gallery perrow="3" heights="200px" widths="250px" caption="Damage to a building in Lüneburg">
<gallery perrow="3" heights="200px" widths="250px" caption="Damage to a building in Lüneburg">


Image:Lueneburg-AmSande1 1.jpg|Figure  4: Salts causing damage to a molded brick
Image:Lueneburg-AmSande1 1.jpg|Figure  4: Salts crystallizing cause a molded brick to powder.
Image:Lueneburg-AmSande1 2.jpg|Figure  5: Salt action under a coat of paint resulting in its detachment and disintegration of the brick.
Image:Lueneburg-AmSande1 2.jpg|Figure  5: Salt action under a coat of paint resulting in its detachment and disintegration of the brick.


</gallery>
</gallery>


=== Efflorescences ===
=== Efflorescence ===
<gallery perrow="3" heights="200px" widths="250px" caption="Efflorescences on architectural ceramics">
<gallery perrow="3" heights="200px" widths="250px" caption="Efflorescences on architectural ceramics">


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== Literature ==
== Literature ==


[[Category:Schwarz,Hans-Jürgen]][[Category:Decay_Pattern:Ceramics]] [[Category:R-CBlaeuer]][[Category:editing]]
[[Category:Schwarz,Hans-Jürgen]][[Category:Decay_Pattern:Ceramics]] [[Category:R-CBlaeuer]][[Category:approved]]

Latest revision as of 09:48, 20 September 2013

Author: Hans-Jürgen Schwarz
English Translation by Sandra Leithäuser
Back to Decay Pattern

Abstract[edit]

Typical deterioration patterns for architectural ceramics are discussed and explained.


Decay patterns of architectural ceramics[edit]

Deterioration of brickwork

Salt-induced damage to bricks is very common.


Glazed architectural ceramics

The glaze on building ceramics prevents the transport of moisture and salts. Often however, the glaze shows "crazing" (a fine network of fissures or cracks) allowing moisture transport through it. And therefore, if salts are present, they will crystallize around these fissures as well as below the glazing around them, leading to its spalling.


Some examples of salt-contaminated architectural ceramics that show the damage induced are shown here:

Flaking[edit]

Powdering[edit]

Efflorescence[edit]

Literature[edit]