An Example of Integrated Geological Survey of Geomaterials and their Weathering Forms : the Reggia di Caserta Main Façade in Studies in conservation, Vol.68 N°3-4(2023; April-May) (2023-04-03)

Public ISBD [article]  inStudies in conservation > Vol.68 N°3-4(2023; April-May) (2023-04-03) . - Pages 432-444 Titre : An Example of Integrated Geological Survey of Geomaterials and their Weathering Forms : the Reggia di Caserta Main Façade Type de document : texte imprimé Année de publication : 2023 Article en page(s) : Pages 432-444 Langues : Anglais (eng) Catégories : Caserte (Italie) -- Palazzo reale Constructions -- Effets des agents atmosphériques Constructions -- Protection Façades -- Italie -- 18e siècle -- Conservation et restauration Façades -- Italie -- 18e siècle -- Déterioration -- Dessins et plans Géomatériaux -- Détérioration Palais -- Italie -- 18e siècle -- Conservation et restauration Paragenèse (géologie) Pétrologie Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : ABSTRACT This paper reports a detailed study on some relevant portions of the main façades of Caserta Royal Palace (Reggia di Caserta), one of the most important Italian monuments, comparable for its impressive architecture to the Royal Palace of Versailles in France and considered the largest royal palace in the world by volume. The research was focused on the weathering pathologies affecting the stone surfaces that, in the last decades, suffered several detachments of fragments from the coatings and from other architectural elements such as string courses, eaves, and capitals. A preliminary characterization of the materials of the façades and an evaluation of the relative weathering pathologies provided the information required for appropriate restoration and securing of these portions of the building. In particular, an innovative evaluation procedure which draws on techniques typical of the earth sciences allowed the proposal of a ‘risk attitude’ applied to discrete portions of the geomaterials used in the built heritage which is based on the influence of different factors leading to weakening of the stone and to the final detachment of rock fragments. Such a large and complete set of information should be carefully considered by the project planners to adopt the required steps for a suitable risk mitigation and for securing the site during restoration. [article] An Example of Integrated Geological Survey of Geomaterials and their Weathering Forms : the Reggia di Caserta Main Façade [texte imprimé] . - 2023 . - Pages 432-444. Langues : Anglais (eng) in Studies in conservation > Vol.68 N°3-4(2023; April-May) (2023-04-03) . - Pages 432-444 Catégories : Caserte (Italie) -- Palazzo reale Constructions -- Effets des agents atmosphériques Constructions -- Protection Façades -- Italie -- 18e siècle -- Conservation et restauration Façades -- Italie -- 18e siècle -- Déterioration -- Dessins et plans Géomatériaux -- Détérioration Palais -- Italie -- 18e siècle -- Conservation et restauration Paragenèse (géologie) Pétrologie Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : ABSTRACT This paper reports a detailed study on some relevant portions of the main façades of Caserta Royal Palace (Reggia di Caserta), one of the most important Italian monuments, comparable for its impressive architecture to the Royal Palace of Versailles in France and considered the largest royal palace in the world by volume. The research was focused on the weathering pathologies affecting the stone surfaces that, in the last decades, suffered several detachments of fragments from the coatings and from other architectural elements such as string courses, eaves, and capitals. A preliminary characterization of the materials of the façades and an evaluation of the relative weathering pathologies provided the information required for appropriate restoration and securing of these portions of the building. In particular, an innovative evaluation procedure which draws on techniques typical of the earth sciences allowed the proposal of a ‘risk attitude’ applied to discrete portions of the geomaterials used in the built heritage which is based on the influence of different factors leading to weakening of the stone and to the final detachment of rock fragments. Such a large and complete set of information should be carefully considered by the project planners to adopt the required steps for a suitable risk mitigation and for securing the site during restoration.

Material Selection for the Hydrophobic Cushion Layer Applied to Earthen Sites in Northwest China in Studies in conservation, Vol.68 N°1-2(2023; January-February) (2023-01-01)

Public ISBD [article]  inStudies in conservation > Vol.68 N°1-2(2023; January-February) (2023-01-01) . - P. 243-257 Titre : Material Selection for the Hydrophobic Cushion Layer Applied to Earthen Sites in Northwest China Type de document : texte imprimé Année de publication : 2023 Article en page(s) : P. 243-257 Langues : Anglais (eng) Catégories : Construction -- Matériaux -- Analyse Constructions -- Effets des agents atmosphériques Constructions en terre -- Chine (nord-ouest) -- Conservation et restauration Constructions en terre -- Chine (nord-ouest) -- Érosion Contraintes (mécanique) Huile de Toung Matériaux -- Couleur -- Altération Polymères vinyliques Sols -- Dégradation Surfaces hydrophobes Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : Earthen sites with important historical, cultural, artistic, social, and scientific values have been seriously damaged. Basal erosion, which is caused by soluble salts, water runoff, and sand-driving wind, is an extremely threatening erosion pattern for earthen sites. A cushion layer which has a damp-proofing function and good physical and mechanical properties can effectively decrease basal erosion. The primary aim of this study is to investigate material selection for the hydrophobic cushion layer for earthen sites in northwest China. The results indicate that cooked tung oil and sticky rice liquid, traditionally used in China, cannot meet the fundamental requirements of sufficient hydrophobicity for the cushion layer. Although polyvinyl alcohol (PVA) solution and tung oil exhibit similar properties in terms of soil hydrophobicity, water vapour permeability, water resistance, surface hardness, and colour difference for samples with 0.0-1.0% content, the PVA solution is significantly better than tung oil in unconfined compressive strength, deformation modulus, wave velocity, and viscosity. Therefore, the PVA solution should be preferentially selected as a hydrophobic cushion layer material according to the results of this work. When the mixing method is adopted, 0.6-1.0% PVA content is the best choice. [article] Material Selection for the Hydrophobic Cushion Layer Applied to Earthen Sites in Northwest China [texte imprimé] . - 2023 . - P. 243-257. Langues : Anglais (eng) in Studies in conservation > Vol.68 N°1-2(2023; January-February) (2023-01-01) . - P. 243-257 Catégories : Construction -- Matériaux -- Analyse Constructions -- Effets des agents atmosphériques Constructions en terre -- Chine (nord-ouest) -- Conservation et restauration Constructions en terre -- Chine (nord-ouest) -- Érosion Contraintes (mécanique) Huile de Toung Matériaux -- Couleur -- Altération Polymères vinyliques Sols -- Dégradation Surfaces hydrophobes Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : Earthen sites with important historical, cultural, artistic, social, and scientific values have been seriously damaged. Basal erosion, which is caused by soluble salts, water runoff, and sand-driving wind, is an extremely threatening erosion pattern for earthen sites. A cushion layer which has a damp-proofing function and good physical and mechanical properties can effectively decrease basal erosion. The primary aim of this study is to investigate material selection for the hydrophobic cushion layer for earthen sites in northwest China. The results indicate that cooked tung oil and sticky rice liquid, traditionally used in China, cannot meet the fundamental requirements of sufficient hydrophobicity for the cushion layer. Although polyvinyl alcohol (PVA) solution and tung oil exhibit similar properties in terms of soil hydrophobicity, water vapour permeability, water resistance, surface hardness, and colour difference for samples with 0.0-1.0% content, the PVA solution is significantly better than tung oil in unconfined compressive strength, deformation modulus, wave velocity, and viscosity. Therefore, the PVA solution should be preferentially selected as a hydrophobic cushion layer material according to the results of this work. When the mixing method is adopted, 0.6-1.0% PVA content is the best choice.

---

1 (1 - 2 / 2)