Revistas UPV. Divulgación

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Desde esta comunidad se tiene acceso a artículos en texto completo de publicaciones periódicas editadas por diferentes unidades académicas de la Universitat Politècnica de València (UPV)

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Browsing Revistas UPV. Divulgación by Subject "Accelerated ageing"

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    Evaluation of morphological changes of aged acrylic, ketone and hydrocarbon resins used in contemporary artworks
    (Instituto Universitario de Restauración del Patrimonio de la UPV, 2006) Domenech Carbo, María Teresa; Mas Barberà, Xavier; Aura Castro, Elvira; Martínez Bazán, Mª Luisa; Dpto. de Conservación y Restauración de Bienes Culturales; Facultad de Bellas Artes; Instituto Universitario de Restauración del Patrimonio
    The present work is focused on the study of morphological changes taking place during the ageing of synthetic resins commonly used in contemporary art (paintings, sculpture, ethnographic objects, etc.) by means of optical microscopy, scanning electron microscopy and, as a novelty, atomic force microscopy. The determination of changes in gloss has also been taken into account. For this purpose, the proposed instrumental techniques have been applied on a series of synthetic resin-based varnishes. Preparation procedures have been developed in order to obtain relevant information on the changes in morphology produced during both the ageing process and exposure to a SO2 saturated atmosphere. Notable changes in the visual appearance of ketone resins, in particular loss of gloss and translucent appearance, are observed which contrasts with the better behaviour exhibited by acrylic resins after ageing, other than a slight yellowing.
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    Hydraulic lime mortar in the ambit of stone restoration: evaluation of applicability
    (Instituto Universitario de Restauración del Patrimonio de la UPV, 2010) Kröner, Stephan Ulrich; Domenech Carbo, María Teresa; Mas Barberà, Xavier; Dpto. de Conservación y Restauración de Bienes Culturales; Facultad de Bellas Artes; Instituto Universitario de Restauración del Patrimonio
    This study presents the results of the applicability of hydraulic lime mortars in the ambit of stone conservation and restoration. Historical buildings, as well as sculptures or ornamental artworks exposed to environmental influences, composed by natural stone materials suffer severe alteration/degradation in the course of time. On this account, the physicochemical properties of hydraulic lime mortars have been compared with those of two calcarenitic rocks (Barxeta and Bateig azul), found in historical Valencian monuments. A systematically analytical procedural method was established on a series of test specimens in order to prove compatibility/replaceability of limestones. The specimens were subjected to standard accelerated physical-chemical ageing tests. Compressive and flexural strength tests have been performed on the mortars and the stone material in order to determine the physical degradation. Alteration by chemical attack was simulated by the exposure in a SO2 pollutant chamber and salt crystallisation test. The experiments performed show that the applied mortars have on one hand similar physical resistance and on the other hand present higher chemical resistance properties, especially against salt crystallisation in comparison to the natural stones and therefore might be of special interest for replicas.