Influence of several metabolites excreted by microorganisms on building stone deterioration
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AuthorBailón Moreno, Rafael; Torres-Agudo, Víctor Manuel; Bolívar-Feriche, Mónica; Bolívar Galiano, Fernando Carlos; Abad Ruiz, Clara
Rogério Amoêda, Sérgio Lira, Cristina Pinheiro, Juan M. Santiago Zaragoza, Julio Calvo Serrano & Fabián García Carrillo
HeritageSustainable DevelopmentMetaboliteMicroorganismAlgaeBiodeteriorationBuilding stoneMarbleLimestoneCitric acidAscorbic acidOxalic acidGlucoseGlycerol
SponsorshipUniversidad de Granada; Ayuntamiento de Granada; Patronato de la Alhambra y Generalife. Consejería de Cultura. Junta de Andalucía; Escuela Técnica Superior de Ingeniería de Edificación de la Universidad de Granada; Turismo Ciudad de Granada. Ayuntamiento de Granada
One of the most important weathering factors of building stone, besides the meteorological phenomena (rain, snow, drought, hail…) is the biodeterioration produced by micro-organisms. In situations of water stress or extreme temperatures, microorganisms respond with the excretion of several metabolites that can affect stone. The effect of some metabolites (citric acid, ascorbic acid, oxalic acid, glucose and glycerol) has been evaluated on two types of stone with dissimilar porosity, limestone and Macael marble. The samples have been subjected to several cycles of exposure to metabolites, followed by freezing and desiccation as well as other cycles without exposure. The deterioration of the stones has been quantitatively evaluated by physical properties (bulk density, porosity, absorption and capillary water absorption). This study has concluded that deterioration depends on the nature of the stone, the presence or absence of metabolite and its chemical nature. The control of microorganisms present on building stone is essential for its conservation.