期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 53, 期 -, 页码 348-359出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2013.11.114
关键词
Biodeterioration; Biofilm; Cyanobacteria; Tertiary bioreceptivity; Recolonization; Mortar
资金
- Junta de Andalucia
- Spanish Ministry of Science and Innovation, Juan de la Cierva research program
- Fundacao para a Ciencia e a Tecnologia (Portugal) [SFRH/BPD/63836/2009]
- Fundação para a Ciência e a Tecnologia [SFRH/BPD/63836/2009] Funding Source: FCT
San Roque church (Campeche, Mexico) was built at the end of the 17th century with a micritic limestone and lime mortar in baroque style. In 2005 the church exhibited heavy biodeterioration associated with the development of extensive dark green phototrophic-based biofilms. Several cyanobacteria belonging to the order Chroococcales and lichenized fungi (Toninia nordlandica, Lobaria quercizans, Lecanora subcarnea, Cystocoleus ebeneus) were predominant in the dark biofilm samples, as revealed by DNA-based molecular techniques. In 2009, a cleaning and restoration intervention was adopted; however, after few months, microbial recolonization started to be noticeable on the painted church walls, representing an early phototrophic-based recolonization. According to molecular analysis, scanning electron microscopy observations and digital image analysis of cross sections, new phototrophic-based colonization, composed of cyanobacteria and bryophytes, developed mainly beneath the restored mortars. The intrinsic properties of the mortars, the tropical climate of Campeche and the absence of a biocide treatment in the restoration protocol influenced the recolonization of the church facades and enhanced the overall rate of deterioration in a short-term period. (C) 2013 Elsevier Ltd. All rights reserved.
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