| Autor: |
Yakovlev, Grigory, Politaeva, Alena, Shaybadullina, Arina, Gordina, Anastasiia, Buryanov, Alexander |
| Zdroj: |
Advanced Materials Research; August 2015, Vol. 1122 Issue: 1 p39-43, 5p |
| Abstrakt: |
The factors influencing the formation of efflorescence of construction materials are connected with the increased solubility of the ingredients of construction materials. Efflorescence may accumulate under some less permeable decorative paint layers and cause their peeling from the surface of a building structure, its decorative properties being completely lost. At the same time, the formation of efflorescence not only as white bloom, but also as "blooming" of the surfaces of materials due to the formation of new chemical compounds is possible. Similar processes occur in the process of operation of coloured pavers manufactured wth vibrocompression of cement and sand mortars with the addition of colouring pigments. The main source of efflorescence is calcium hydroxide Ca (OH)2 which is formed in hardening cement. The alkaline nature leads to its intensive interaction with carbon dioxide CO2. This efflorescence in the second year of operation, as a rule, does not resume due to the carbonation of calcium hydroxide in the structure of set cement. |
| Databáze: |
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