Talk:Origin of Salts: Difference between revisions

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Author:[[user:Hschwarz|Hans-Jürgen Schwarz]]
*[[Salts in Building Materials including foundations]]  
<br>
English Translation by [[user:SLeithaeuser|Sandra Leithäuser]]<br><br>
Back to [[Fundamentals]] <br>
 
*[[Salts in Building Materials including foundations]  
*[[Deicing Salts]]  
*[[Deicing Salts]]  
*[[Salts of Microbiological Origin]]  
*[[Salts of Microbiological Origin]]  
*[[Salts resulting from Restoration Materials]]
*[[Salts resulting from Restoration Materials]]


text moved to the content page. Which titles for the linked pages should be used. The please make changes only onn the content page, not on the discussion page.[[User:Hschwarz|Hschwarz]] 15:14, 2 December 2012 (CET)
 
== Abstract  ==
The salts that cause damage to buildings, including wall paintings, and monuments made of stone, brick and other inorganic building materials, can originate from both natural sources or human activities. Natural sources are, for example, salts present in the ground on which the building stands. But they can also be present in the material itself, for example brick or some cements, depending on their manufacture; in stones near flood plains or from the natural stone weathering cycle. They can be brought in by sea spray and wind, for buildings in coastal areas and some microorganisms growing on building materials may generate some. Salts originating from human activities can be linked to emissions from burning fossil fuels, agricultural activities, automotive combustion engines and the use of deicing salts. Historic buildings may also have been used to store salt or gun powder, or even as stables  Over the years, salts will accumulate within or near the surface of the building as water evaporates. Since what migrates within the stone are the ions of the various salts present when water enters the porous system, the accumulation of ions upon water evaporation may result in the formation of different combinations of them,i.e., different salts to the ones entered the material originally.
 
== Introduction  ==
Every natural liquid water can be considered a more or less diluted salt solutions as confirmed by simple electrical conductivity measurements. When water enters porous building materials, such as stone, brick, mortar or plaster, salts will also enter their pore space. As water evaporates at the suface of these materials, salts will accumulate near that area and eventually, some salt efflorescence will result.<br>
 
Some salts are introduced into the buildings or monuments by human activity. These may be contaminated due to [[Salts in restoration materials|consolidants and and cleaning agents]] but also due to historical storage of salt or gun powder, alkaline [[Salts in building materials|building materials]] like water glass or Portland cement, were used extensively in some countries over the last century. Some damages previously referred to as a result of acid rain are now known to be due to the use of these materials. <bib id="Klemm.etal:1999" />  [[Deicing salts]] should be added to the list of these materials, because they are still being used and they will affect mostly bridges, tunnels and foundations of buildings near roads. Other sources for damaging salts can be fertilizers and detergents that are introduced through ground and surface water. Finally, cleaning interventions based on the use of alkaline materials followed by an acid rinse, can leave soluble salts behind. This cleaning approach is used for brick masonry in some countries.
 
All natural materials are contaminated with salt-forming ions, varying from low to very high levels. These include building materials, e.g., natural stone or brick, and binding agents, such as lime, cement and renders. The [[Building substrate and subsoils|substratum, subsoil consistency]], ground- and surface water also play a role <bib id="Roesch.etal:1993" />. Beside natural emissions by volcanoes ((H<sub>2</sub>S, HCl, HF, SO<sub>2</sub> etc.) and sea- water aerosols (NaCl etc.), <bib id="Steiger.etal:1994b"/><bib id="Steiger.etal:1997"/><bib id="Steiger.etal:2002"/><bib id="Becker.etal:2005"/>, anthropogenic emissions are becoming more important.
 
The generation of energy, emissions from traffic and so forth, produce a great number of damaging substances, of which sulfur dioxide (with the secondary product sulphate)<bib id="Wittenburg.etal:1993"/> and nitrogen oxides (with the secondary product nitrate), are the most familiar. It is still not fully understood, how ozone (O3) and the large number of organic compounds participate in the destruction of cultural property. [[Immissions]] mostly reach the objects through dry or wet deposition <bib id="Steiger.etal:1989"/>  by rainwater or fog, but also through accumulation in the subsoil.
 
Nitrates and organic salts such as oxalates mostly are of [[microbiological origin]]. While nitrates are transported into the object by humidity, oxalates are usually formed in situ, where they remain due to their low solubility.
 
== Literature ==
<biblist/>
 
[[Category:Origin of Salt]] [[Category:inReview]][[category: Schwarz,Hans-Jürgen]]
 
Würde dies gerne hinzufügen [[User:SLeithaeuser|SLeithaeuser]] 13:18, 6 September 2012 (CEST)

Latest revision as of 14:14, 2 December 2012

text moved to the content page. Which titles for the linked pages should be used. The please make changes only onn the content page, not on the discussion page.Hschwarz 15:14, 2 December 2012 (CET)

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