Osca PonsĪpplications of Reflectance Transformation Imaging for Documentation and Surface Analysis in ConservationĬonservators at Universitat Politécnica de Valencia, Spain, explore the advantages and potential applications of Reflectance Transformation Imaging (RTI) as an innovative instrument for the documentation and analysis of texture of cultural objects undergoing conservation treatments. Keywords: Ultra close-range photogrammetry Cleaning treatments Surface pattern surviving Colorimetric analysis Monitoring. The advantages due to the portability and to the non-destructivity of photogrammetry (no-contact measurement method) with regard to others techniques candidates, led this methodology to be used in wider restoration works. The performed tests on the case study demonstrate the ability of the proposed approach to control the effectiveness of the cleaning procedures applied on wall paintings during conservation interventions. The colorimetric information on selected areas during and after the cleaning completes the surviving activity. The obtained information on the third dimension of the surface by means of ultra close-range photogrammetry was compared with results performed by 3D optical microscope (only on selected single points). The cleaning treatments studied in this work are chemical cleaning, and laser cleaning. The ultra close-range photogrammetry is a total non-invasive method, fully portable, and easy to use. A non-destructive technique could be particularly highlighted as an assessment tool to this aim the authors propose the photogrammetry method in ultra close-range mode. The criteria traditionally chosen for the selection of the adequate cleaning procedure are the evaluation of the amount of material removed during the treatment and the surface variations (roughness) before and after the treatment. Since the removal of the material is an irreversible operation, an extremely selective method is needed. The cleaning treatments are critical operations in conservation so the choice of the method and the definition of the protocol require preliminary activities and studies for the optimization of the procedure. In the present work authors show the results obtained by means of the application of ultra close-range photogrammetry for assessing the pattern of a detached wall painting’s surface during/after cleaning treatments. Ultra Close-range Photogrammetry to Assess the Roughness of the Wall Painting Surfaces after Cleaning Treatments Keywords:Historical mortars Lisbon quay Pombaline reconstruction Heritage Waterfront It was confirmed the use of local sands and aerial lime based binder. This methodology allowed determining the simplified composition of mortars. The analytical methodology comprised: the qualitative mineralogical analysis by powder method of total sample by X-Ray diffraction the quantitative chemical analysis of total sample by X-Ray fluorescence the water absorption by capillarity coefficient the determination of hydrochloric acid insoluble residue and the granulometric analysis of insoluble residue.
This paper presents the mineralogical, chemical and granulometric characterization and capillarity water absorption of samples from these mortars.
During the reconstruction intervention ancient mortars, from the core, were sampled in order to study them. In 1997 the quay was partially dismounted and in 2008 was reconstructed. Characterization studies of mortars from this period are still very few. By bookmarking this link you can directly jump to the most recent papers on monumental quay Cais das Colunas was built in the decades 1770 to 1790, merged in the reconstruction plan of the city of Lisbon after the great 1755 earthquake. You can access the most recent arxiv papers through the address.Similarly you can expand the abstract using 'a', see the figures using 'f' and see the bibtex using 'b'. You can scroll any list of papers on benty-fields using the key 'j' for down and 'k' for up.If you are an author of a paper which displays such an embedded video, you can edit video under 'My seminars' (if the paper is listed in your 'My papers' library category). If any seminar or recording is linked to a paper, the seminar will show up as a embedded video underneath the paper (e.g.All that is needed is that people who organise these seminars make them accessible for everyone, not just people in their institutes. Many institutional seminars are now online, offering the opportunity to have a potentially huge number of seminars available to all of us.Most recently we added the seminars page, where you can advertise live seminars or recordings.
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