Publications
Fiber Bragg grating based displacement sensors with low visual impact for structural health monitoring applications – Monastery of Batalha case
A novel, low-visibility displacement sensing system using fiber Bragg gratings has been successfully implemented for long-term structural health monitoring at the UNESCO-listed Monastery of Batalha. This minimally intrusive approach allows for precise tracking of crack and joint movements with minimal visual impact, addressing preservation challenges for heritage sites. The sensors, featuring transparent holders and adjustable pre-strain mechanisms, offer a cost-effective, versatile alternative to traditional methods. Initial data collected over months demonstrates their operational efficacy, providing valuable insights for future conservation interventions.
Non-intrusive monitoring of historic structures using fibre Bragg gratings – Application at the monastery of Batalha
Fibre Bragg gratings (FBGs) emerge as a groundbreaking tool for preserving the structural integrity of historic sites, offering real-time monitoring without compromising authenticity. Applied at the Monastery of Batalha, these non-intrusive sensors detected potential active movement in the cloister, demonstrating their capability to track stresses, strains, and environmental conditions with precision. The study combined FBG technology with laser scanning for a comprehensive assessment, emphasizing the need for reversible sensor integration to safeguard heritage structures while enabling early intervention. This approach sets a new standard for structural health monitoring (SHM) in conservation efforts.
The Role of Bacteria in Pink Stone Discoloration: Insights from Batalha Monastery
Pink discoloration on the Ançã limestone of Batalha Monastery, a UNESCO World Heritage Site in Portugal, is primarily driven by bacterial biofilms producing carotenoid pigments. Key bacterial genera identified include Bacillus, Gordonia, Serratia, Methylobacterium, and Halalkalicoccus, with high-throughput DNA sequencing and culture-dependent methods revealing their role in biodeterioration. Biocolonization tests using stone mock-ups under simulated monastery conditions confirmed the link between bacterial activity and discoloration, offering critical insights for targeted conservation strategies.
The Archival Sources of the Batalha Monastery (Portugal): Unique Collections for the Study of the Monument’s Restoration Work in the 19th Century
A unique and unprecedented archival collection, primarily housed within the Monastery of Batalha itself, offers an unparalleled reconstruction of its 19th-century restoration work. This meticulously documented process, spanning from 1840 to 1900, transformed the former Dominican monastery into a national historical monument while preserving detailed records of interventions and methodologies. The study highlights the exceptional character of these sources within Portuguese monumental archives, their significance in understanding the restoration history of Batalha and broader trends in Portugal, and their potential for interdisciplinary research, including integration with modern technological advancements.
Biodegradation and Microbial Contamination of Limestone Surfaces: An Experimental Study from Batalha Monastery, Portugal
Lichens significantly contribute to the biodeterioration of limestone at Batalha Monastery, Portugal, through mechanical penetration and chemical dissolution. The study used advanced microscopy (OM, LV-SEM + EDS) and X-ray micro-diffractometry (μ-XRD) to analyze stone fragments, while NGS metagenomic DNA testing identified bacterial communities within biofilms. Air quality monitoring revealed that sulfur, nitrogen, and phosphorus-rich pollutants may fuel microbial growth, exacerbating limestone degradation. This research highlights the complex interplay between biological colonization and environmental factors in cultural heritage preservation.
Provenance study of the limestone used in construction and restoration of the Batalha Monastery (Portugal)
A provenance study of the limestone used in the construction and restoration of the Batalha Monastery in Portugal reveals distinct sources for different architectural elements. Analysis using energy-dispersive X-ray fluorescence spectroscopy (ED-XRF), powder X-ray diffractometry (PXRD), and thermogravimetric analysis (TGA) identified that the baluster likely originated from the Valinho do Rei or Reguengo do Fetal quarries, while other components such as part of the church railing, north-aisle eaves arch, and Royal Cloister came from the Pidiogo or Cabeço do Roxo quarries. These findings were supported by Ca-Sr binary diagrams and petrographic evidence, providing insights into the historical construction practices and material sourcing of this UNESCO World Heritage Site.
Surface orange patinas on the limestone of the Batalha Monastery (Portugal): characterization and decay patterns
Orange patinas on the limestone of Batalha Monastery, Portugal, exhibit distinct compositions and decay patterns, suggesting diverse formation pathways. Analysis via μ-XRD and LV-SEM+EDS revealed that the ornament's patina primarily consists of gypsum with minor hematite, indicating possible intentional application as a tint plaster mixture of ochre and lime, while the window tracery's patina contains Ca-oxalates (weddellite and whewellite) with minor hematite, likely formed naturally due to atmospheric pollutants or bacterial activity. The ornament shows decay and delamination, whereas the window tracery exhibits granular decohesion without delamination. This study highlights the complexity of patina formation on limestone monuments and their susceptibility to degradation.
A Building Information Modeling Approach to Integrate Geomatic Data for the Documentation and Preservation of Cultural Heritage
A groundbreaking approach integrating Building Information Modeling (BIM) with multiple non-destructive testing (NDT) techniques—terrestrial laser scanning, ground-penetrating radar, infrared thermography, and UAS-acquired RGB imaging—enables advanced documentation and preservation of cultural heritage sites. Applied to the Monastery of Batalha in Portugal, this method allows for detailed, non-invasive analysis of structural elements like buttresses and masonry vaults, optimizing data treatment and integration within a BIM framework. The study demonstrates how combining geomatic data with automated pathology classification enhances facility management, restoration planning, and research, offering a scalable solution for UNESCO World Heritage Sites.
Mineralogical and chemical characterization of surfa ce orange layers on the limestone of the Monastery of Batalha, Central Portugal
A mineralogical and chemical analysis of orange surface layers on the limestone balustrades and sculptures of the Monastery of Batalha, Portugal, reveals that these patinas are primarily composed of gypsum and hematite, with minor components including halite and weddellite. This finding challenges the assumption that such patinas form naturally through weathering, suggesting instead that they may have been intentionally applied for protective or aesthetic purposes. The study employed X-ray micro-diffractometry (µ-XRD) and low-vacuum scanning electron microscopy coupled with energy-dispersive spectrometry (LV-SEM + EDS) to characterize the layers. These results are compared to 'scialbatura,' a common protective coating used in monument conservation, providing insights into potential historical techniques for stone preservation.
A canopy from the Portuguese Medieval Monastery of Batalha: a singular exemple of micro-architecture in the Cloisters Collection
A unique architectural canopy from the medieval Monastery of Batalha, now part of the MET Cloisters Collection, exemplifies remarkable micro-architecture and artistic quality. This 14th-century piece, originally surmounting one of the Apostle statues at the monastery's main portal, reflects the dual function of Portuguese medieval monasteries as both divine temples and royal funerary places. The study traces the canopy's journey through restoration, art markets, and its current location, while analyzing its composition in relation to the monastery’s architecture. It highlights the canopy's significance as a singular example of master Huguet’s work on the Batalha construction site.
A combined petrographic and geochemical metrological approach to assess the provenance of the building limestone used in the Batalha Monastery (Portugal)
A combined petrographic and geochemical study reveals distinct limestone provenances used in the construction and restoration of the Batalha Monastery, Portugal. By analyzing calcium and strontium alignment via X-ray fluorescence (XRF), along with thin-section petrography, X-ray diffraction (XRD), and thermogravimetric analysis (TGA), researchers identified multiple quarry sources contributing to different parts of the monastery. This finding provides critical insights for future studies on stone decay and conservation strategies, ensuring the preservation of this UNESCO World Heritage Site.
The ground-penetrating radar (GPR) method in the characterization of the Monastery of Batalha
Ground-penetrating radar (GPR) revealed hidden structures and historical details within the Monastery of Batalha, offering critical insights for preservation efforts. The non-destructive method provided high-resolution 2D/3D images, identifying ancient foundations, columns, and archaeological features, including those in the Cloister of D. João I and the Church. GPR's efficiency allowed for rapid data acquisition, contributing to a proposed inner structure model of the walls. These findings underscore its potential as a valuable tool for conservation, recovery, and rehabilitation of UNESCO World Heritage Sites.
The Influence of Environment in the Alteration of the Stained-Glass Windows in Portuguese Monuments
Research reveals that environmental conditions significantly influence the alteration of stained-glass windows, with potash-lime silicate glass being the most susceptible to degradation. The study exposed soda-lime, potash-lime, and mixed-alkali silicate glasses in three Portuguese monuments—Monastery of Batalha, Monastery of Jerónimos (Lisbon), and Cathedral of Évora—for 10 and 20 months. Analysis using optical microscopy and Fourier transform infrared spectroscopy showed that crystalline deposits varied based on atmospheric conditions, with high humidity environments like those in Batalha and Jerónimos leading to more severe alteration layers. While the Cathedral of Évora exhibited dust and salt accumulation without severe chemical damage, the findings underscore the importance of environmental factors in preserving stained-glass heritage.
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