Impacto da colonização do fungo Cladosporium sphaerospermum sobre a argamassa do concreto
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Data
2003-01-31
Autores
Pinheiro, Sayonara Maria de Moraes
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Universidade Federal do Espírito Santo
Resumo
The understanding of the different deterioration mechanisms, which can attack the concrete, is highly relevant to predict, prevent or minimize the deterioration of the concrete constructions. Among the several deterioration mechanisms of concrete, the biodeterioration is one of the more recently observed. The full description of the biodeterioration of concretes is very complex and involves the necessity for synthesis of information from diverse disciplines and cross specialization. The main objective of this study was to observe the aesthetic and microestructural impacts of the Cladosporium sphaerospermum colonisation on the concrete. mortars. This work includes a literature review of the microstructure of materials, kinds of microorganisms and their metabolisms, types and mechanisms of biodeterioration, preventive measures and treatment against the biodeterioration, and techniques for analysing microstructure of concrete. The methodology used consists of inoculating the concrete mortars with spores of fungus Cladosporium sphaerospermum, which produces a dark and large stain on the surface of the material (aesthetic impact). The impact of the fungus on the material microstructure was evaluated by using the following techniques: XRD, SEM/EDS, TG, DTA, chemical analysis and mineralogical calculation. These techniques allowed detecting the calcium carbonates solubilisation as well as the evidence of the beginning of a chemical biodeterioration of the concrete.
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Biodegradação , Concreto , Argamassa , Durabilidade (engenharia) , Microorganismos , Fungos , Cladosporium
Citação
PINHEIRO, Sayonara Maria de Moraes. Impacto da colonização do fungo Cladosporium sphaerospermum sobre a argamassa do concreto. 2016. Dissertação (Mestrado em Engenharia Civil) - Universidade Federal do Espírito Santo, Centro Tecnológico, Vitória, 2003.