24 documents found, page 1 of 3
Utilização da microperfuração na caracterização de materiais heterogéneos: prop...
Costa, D.; Delgado Rodrigues, J.A avaliação da resistência por microperfuração tem grande utilidade na caracterização dos materiais que constituem as superfícies arquitectónicas e é particularmente relevante no estudo dos efeitos dos tratamentos de consolidação. Nas argamassas de baixa resistência, como as de cal aérea, verifica-se uma heterogeneidade muito elevada, atribuída aos valores característicos da matriz aglomerante e aos picos resul...
Volumetric and chromatic reintegration in conservation of in situ glazed tiles
Mendes, M.; Ferreira, T.; Candeias, A.; Delgado Rodrigues, J.; Mimoso, J.; Morais Pereira, S.Volumetric and chromatic reintegration is one of the most important but challenging treatments in conservation of in situ glazed tiles due to the need to protect them from water intrusion and further deterioration despise the demanding conditions and requirements needed in outdoor exposure. A set of six infill pastes based on aerial lime, hydraulic lime, aerial lime plus vinylic resin, epoxy resin and polyester...
Geopolymers in cultural heritage: their application in azulejo conservation
Geraldes, C.; Lima, A.; Delgado Rodrigues, J.; Mimoso, J.; Morais Pereira, S.Currently, the restoration materials used to fill gaps in architectural historic azulejos (e.g. lime or organic resin pastes) present relevant drawbacks in terms of compatibility, efficacy or durability. The current solutions are not able to fully protect the azulejos resulting in further deterioration. Geopolymers can be a potential solution for azulejo lacunae infill given the chemical-mineralogical similitud...
Drying of porous building materials possibly contaminated with soluble salts: s...
Gonçalves, T. D.; Brito, V.; Musacchi, J.; Pel, L.; Saidov , T.; Delgado Rodrigues, J.; Costa, D.; Mimoso, J.Moisture causes severe and recurring anomalies in the built heritage, but removing it from the solid and thick masonry walls of old constructions is not easy, especially when soluble salts are present. These salts crystallize during drying, may harm the materials and their aesthetics. Moreover, the salts themselves and the alterations they cause affect the underlying drying process through mechanisms that requi...
Magnitude of the stage I drying rate of porous building materials with differen...
Gonçalves, T. D.; Brito, V.; Pel, L.; Delgado Rodrigues, J.In building conservation, many problems are related to the presence of water in porous materials such as stone, mortars and ceramics. Indeed, moisture can be seen as the catalyst for many deterioration mechanisms. It gives rise to harmful chemical reactions, such as sulphate attack, enables biodeterioration and prompts salt decay, one of the most harmful deterioration mechanisms of porous building materials. A ...
CerAzul: Assessment and development of materials and techniques for the conserv...
Morais Pereira, S.; Esteves, L.; Mendes, M.; Musacchi, J.; Delgado Rodrigues, J.; Mimoso, J.CerAzul aims to study, evaluate and optimize the treatments used in the conservation and restoration of architectural tiles (azulejos). The interventions that will be considered in more detail are the consolidation of the ceramic matrix, the re-adhesion of the glaze and biscuit fragments, and the volumetric reintegration of azulejo lacunae. The scientific state of the art on the application of these treatments ...
Evaluation of the strengthening effect of consolidants applied on porous and fi...
Costa, D.; Delgado Rodrigues, J.The evaluation of the efficacy of stone consolidant treatments is a very important step in the selection process of the product to be used in a real situation. The procedure to select the appropriate product should be a step-by-step program. Sonic measurements and drilling resistance are currently used as non- or micro-destructive methods to evaluate the cohesion increase promoted by the treatment but they can ...
Consolidation of a porous limestone with nanolime
Costa, D.; Delgado Rodrigues, J.This communication work reports the laboratory experiments with a nanolime product applied to the highly porous limestone currently used in Portuguese architectural heritage. The tests aimed at evaluating the short-term efficacy of the product to induce a mass consolidation effect. Other substrates were also tested for comparative purposes, namely a limestone with a different pore size distribution and a weak l...
THE PRODOMEA PHASING AND COMPATIBILITY INDICATORS AS TOOLS FOR THE PLANNING AND...
Revez, M. J.; Raposo, M.; Delgado Rodrigues, J.The PRODOMEA 8-phase model is a DSS that aims at tackling with the diversity of conditions, materials, methods and disciplines involved in monument conservation interventions by accompanying planners through conceiving, designing and execution phases, suggesting recommended actions and key actors for each phase. For most recommended actions, different options available should be considered in light of their phy...
O restauro do património azulejar
Morais Pereira, S.; Esteves, L.; Mendes, M.; Delgado Rodrigues, J.; Mimoso, J.Pretende-se dar uma visão geral sobre as principais técnicas e materiais utilizados para o restauro do património azulejar em Portugal fazendo o ponto de ligação da prática com a investigação científica que existe nesta ou em áreas afins. E por fim é objetivo introduzir o projeto CerAzul e o plano delineado para identificar materiais mais eficazes, compatíveis e duráveis para o tratamento de azulejos e preenche...