Architectural Ceramics: Difference between revisions
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Some examples of salt-contaminated glazed building ceramics are shown here. | Some examples of salt-contaminated glazed building ceramics are shown here. | ||
=== | === Flaking === | ||
<gallery perrow="3" heights="200px" widths="250px" caption="Decay pattern on a brick of the St.Jakobi church in Perleberg"> | <gallery perrow="3" heights="200px" widths="250px" caption="Decay pattern on a brick of the St.Jakobi church in Perleberg"> | ||
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Image:Per_270603_5-13_14.jpg|Figure 2: Photo of a thin section in polarized light. The grey parallel crystals are gypsum. | Image:Per_270603_5-13_14.jpg|Figure 2: Photo of a thin section in polarized light. The grey parallel crystals are gypsum. | ||
Image:Per 270603 5-13 15.jpg|Figure 3: Photomicrograph as Fig 2 but with crossed polarisers. It is clearly seen that the plaster is both responsible for the damage and on the other hand, he acts in this case as a kind of glue that holds together the broken brick pieces. With the removal of the original plaster the brick material would be lost.</gallery> | Image:Per 270603 5-13 15.jpg|Figure 3: Photomicrograph as Fig 2 but with crossed polarisers. It is clearly seen that the plaster is both responsible for the damage and on the other hand, he acts in this case as a kind of glue that holds together the broken brick pieces. With the removal of the original plaster the brick material would be lost.</gallery> | ||
===Back Weathering === | ===Back Weathering === |
Revision as of 15:10, 1 June 2011
<bibimport/>
Author: Hans-Jürgen Schwarz
Back to Decay Pattern
Abstract
Typical damage patterns are presented and explained.
Decay Pattern of Architectural Ceramics
Ziegelschäden
Salt-induced damage to bricks are common.
Damage to bricks can look like this:
Glazed Architectural Ceramics
The glaze of a glazed building ceramics prevents both the transport of moisture and salts. Often however glaze is crackled, which allows a capillary moisture transport. The Craquelée particularly clear shows an existing salt load, which consequently often leads to the spalling of the glazes.
Some examples of salt-contaminated glazed building ceramics are shown here.
Flaking
Figure 3: Photomicrograph as Fig 2 but with crossed polarisers. It is clearly seen that the plaster is both responsible for the damage and on the other hand, he acts in this case as a kind of glue that holds together the broken brick pieces. With the removal of the original plaster the brick material would be lost.