Artículos, informes y presentaciones en Congresos
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Examinando Artículos, informes y presentaciones en Congresos por Autor "Alfieri, Paula Vanesa"
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Acceso Abierto Biodegradation and biodeterioration of wooden heritage: role of fungal succession(2016) Alfieri, Paula Vanesa; García, Renato Andrés; Rosato, Vilma; Correa, María VerónicaWood from heritage is usually attacked by wood-decay fungi generating mainly loss of dimensional and structural stability. The study of wood biodegradation process and its mechanism allow the obtaining of tools for wood conservation. In this paper, wood biodegradation and biodeterioration processes were studied in order to acquire a direct and visual indicator of the beginning of wood degradation. This indicator will allow the consolidation and protection of wood before it will be structurally compromised. Wood degradation conditions found in turntable were reproduced in laboratory by accelerated processes: environment degradation was developed by fluctuation cycles of humidity and temperature. Biological degradation was performed using wood decay fungus isolated from wooden heritage samples. The wood samples were inoculated with an equal amount of mycelia until abortive basidiomata emerged. The result analysis indicated that even though each species occupies particular niches, first settlers (environmental fungi) would generate a material more bioreceptive for wood decay fungi being replaced each other as dynamic communities. Consequently, environmental fungi allow the wood decay fungi to colonise and exploit better their ecological niche (succession). It was concluded that the appearance of first settlers is therefore a reliable visual indicator of the need of wood consolidation in order to preventing irreversibly wooden heritage loss. - Artículo
Acceso Abierto Conservation of a Wooden Tomb-Marker from the Jewish Cemetery of Algarrobos in Argentina(2018) Alfieri, Paula Vanesa; Lofeudo, Rosana; Canosa, Guadalupe; Iloro, Fabián Horacio; Traversa, Luis PascualThe state of conservation of some tombs in the Jewish Cemetery of Algarrobos in Colonia Mauricio, Buenos Aires, Argentina was evaluated. A lot of material was found, but only two tomb-markers were done on wood. They were in a state of serious deterioration, so these were defined as an object of study. The tomb-markers, which had been established by the Jewish immigrants from Russia at the end 19th century, were made of South American tree known as Aspidosperma Quebracho Blanco and suffered both biological (from fungal decay and insect attack) and mechanical deterioration (cracks and fissures due to weathering, and discoloration due to ultraviolet radiation). Thus, the aim of this paper was the conservation of one of the two remaining wooden tomb-markers found, using impregnant based on non-toxic siloxanes employing sol-gel technology in order to increase the readability of epitaphs and reliefs found at the tomb-marker. The treatment with this modern technology resulted in the excellent performance of wooden tomb-maker conservation. The structural consolidation and cracks sealing were achieved. It avoided the detachment of material and the appearance of natural veins; furthermore, it improved the reading of the epitaphs and reliefs. - Artículo
Acceso Abierto Design and manufacture of insulation panels based on recycled lignocellulosic waste(2021) Jensen, María Sol; Alfieri, Paula VanesaThis paper has been focused on the properties of construction material based on cellulose. More specifically, their use as non-bearing walls, coating-panels and/or anti-humidity panels. It has been obtained from the recycling of urban waste, such as paper and paperboard. The performance of this material has been evaluated in relation to five parameters: dimensional stability against humidity, fire action, decay resistance front fungal degradation, and, their behavior as temperature and acoustics isolation. The performance of manufactured materials has been verified considering environmental factors, and simulating the condition of the material in service. This yielded satisfactory results in relation to all the agents mentioned, which allows concluding that the material fulfills the desired function. It has been concluded that the designed and manufactured panels have the necessary characteristics to replace insulating materials or Gypsum plasterboard type enclosure, extending the range of materials for this function, through the incorporation of a new option based on recycled raw material, low-cost manufacture and minimal energy resources used. - Artículo
Acceso Abierto Low Density Wood Impregnation with Water-Repellent Organosilicic Compounds(2018) Canosa, Guadalupe; Alfieri, Paula Vanesa; Giúdice, Carlos A.Many protective treatments for low density wood are applied by impregnation to give water-repellency and to control pathologies that usually have this substrate. The properties of Araucaria angustifolia , chemically modified by impregnation with methyltriethoxysilane, n-octyltriethoxysilane and mixtures of both in several ratios, were investigated to achieve mainly high dimensional stability, low capillary water absorption as well as satisfactory water vapor permeability. The aforementioned impregnants produce the wood chemical modification, involving the reaction of hydroxyl groups of the wood with the hydrolysis products of alcoxysilanes. It is concluded that the organosilicon polymers allow improving important characteristics of wood: 1) the non-occlusive coating keeps the water vapor permeability unaltered; 2) the alkoxysilane type defines the hydrophobicity and the continuity of coating formed on the pore wall and finally; 3) the polymeric structure formed after finishing sol-gel process incises both on the capillary water absorption and the dimensional stability. In addition, the studied treatments have the advantage of allowing that the water vapor, which permeates through the organosilicon coating placed on cell wall, can exit by hydrophobic repulsion and thus, prevent faults appearance generated by the condensed water inside of wood.