Comportamiento de tejas de diferente color (rojo y paja) frente al biodeterioro
Biocolonization of building materials is a critical problem for the durability of constructions. Industrial experience shows that straw coloured roofing tiles are more prone to colonization than red roofing tiles, even having similar characteristics. The aim of this work is to explain the difference...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2014-10-01
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| Series: | Boletín de la Sociedad Española de Cerámica y Vidrio |
| Subjects: | |
| Online Access: | http://ceramicayvidrio.revistas.csic.es/index.php/ceramicayvidrio/article/view/1300/1336 |
| Summary: | Biocolonization of building materials is a critical problem for the durability of constructions. Industrial experience shows that straw coloured roofing tiles are more prone to colonization than red roofing tiles, even having similar characteristics. The aim of this work is to explain the difference of biocolonization between different colour roofing tiles. The chemical composition of the surface of straw coloured and red roofing tiles, the phase composition and the microstructure of the roofing tiles were determined by WD-XRF, XRD and SEM-EDX, respectively. The pore size distribution was carried out by Hg porosimetry. The solubility was studied by determining the soluble salts (Ca, Mg, Na, K, Cl and SO<sub>4</sub> <sup>2-</sup>) by ICP-OES and ionic chromatography. Roofing tile bioreceptivity was evaluated by determining fluorescence intensity using a pulseamplitude- modulated (PAM) fluorometer, and cyanobacteria <em>Oscillatoria sp</em>.
The results obtained show higher concentration of calcium and sulphur in straw coloured roofing tiles surface, and higher solubility than red roofing tiles. Moreover, according to the results obtained in bioreceptivity assays, straw coloured roofing tiles are more prone to colonization than red roofing tiles, so, there is a relationship between surface properties of roofing tiles and biocolonization, as it is observed in industrial products.<br><br>La colonización biológica es un fenómeno que afecta de forma negativa a la durabilidad de los materiales de construcción. A nivel industrial se ha observado que las tejas de color paja muestran mayor tendencia a la colonización biológica que las tejas de coloración rojiza, incluso cuando ambas presentan características similares.
El objetivo de este trabajo es determinar la causa de las diferencias de biocolonización entre tejas de diferente color. Para ello, se ha determinado la composición química de la superficie de tejas de color paja y de color rojo mediante WD-FRX, la composición mineralógica por DRX, la microestructura de la superficie mediante MEB-EDX, la distribución del tamaño de poros mediante porosimetría de mercurio, y la solubilidad (Ca, Mg, Na, K, Cl and SO<sub>4</sub><sup>2-</sup> por ICP-OES y cromatografía iónica). Se ha evaluado la biorreceptividad midiendo la intensidad de fluorescencia con un fluorómetro, utilizando la cianobacteria
<em>Oscillatoria sp</em>.
Los resultados muestran una mayor concentración de calcio y azufre, y una mayor solubilidad de éstos, en la superficie de las tejas paja, y éstas presentan una mayor tendencia a la colonización. Por lo tanto, el hecho de que presenten sales solubles en superficie favorece la biocolonización, y con ello, el deterioro estético y funcional del tejado. |
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| ISSN: | 0366-3175 2173-0431 |