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"Building, Stone History."
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Stone
A fascinating, visually rich collection, 'Stone' explores the appeal of this essential material through 170 structures from the last 5,000 years. Organized into such themes as Texture, Juxtaposition, and Light, it highlights stone's range and unique qualities with stunning photographs of ancient tombs, churches, cultural spaces, houses, and beyond. The book features projects from celebrated architects including Philip Johnson, Antoni Gaudi, and Mies van der Rohe, as well as the best contemporary talent such as Kengo Kuma, Grafton Architects, and Snohetta.
Book
Archaeology and Geology of Ancient Egyptian Stones
The ancient Egyptian Civilization dominated the northeast corner of Africa—including modern-day Egypt and, at times, northern Sudan—from about 3000 BC at the beginning of the Dynastic period to AD 642 at the end of the Roman period. Most of what it left behind consists of stones of many kinds. There were building stones for temples, pyramids, mastaba tombs, and other monumental constructions; and utilitarian stones for tools, weapons, and a wide array of mundane applications, including the raw materials for faience, glass, medicines, paint pigments, and pottery. There were also ornamental stones for decorative and structural elements in buildings, obelisks, statues, sarcophagi, stelae, vessels, shrines, offering tables, mace heads, cosmetic palettes, and other sculpted objects; and gemstones for jewellery, amulets, seals, and other small decorative items. Still more stones were processed to extract their metals, including gold, copper, iron, and lead.
Two persistent problems in Egyptology have been the geological identification of these stones, and the recognition of their sources. Archaeology and Geology of Ancient Egyptian Stones seeks to identify and describe all the rocks and minerals employed by the ancient Egyptians using proper geological nomenclature, and to give an account of their sources in so far as they are known. A secondary objective is to describe the multitudinous uses of the stones as well as the technologies employed to extract, transport, carve, and thermally treat them.
eBook
Pyramids of Egypt
\"Carefully leveled text and vibrant photographs introduce early readers to the science and engineering behind the Pyramids of Egypt. Includes infographics, an activity, glossary, and index\"-- Provided by publisher.
Book
Petrographic characterization and durability of carbonate stones used in UNESCO World Heritage Sites in northeastern Italy
This paper presents the petrographic and textural characterization of some ornamental limestones widely used in UNESCO World Heritage Sites in northeastern Italy, and the assessment of the main decay factors present in the environment where they are employed. Eleven carbonate building materials have been here considered, all commonly present in the built environment of northeastern Italy: two different varieties of Vicenza Stone (Nanto and Costozza), of Verona Stone (Red and Brown Verona), of Asiago Stone (Pink and White Asiago), and of Chiampo Stone (Ondagata and Paglierino), the Istria Stone (Orsera), the Aurisina Stone, and the Botticino Stone. The Carrara marble is also considered, and used as a reference material for the determination of the grain-size distribution. Stone durability was measured by accelerated aging tests which reproduced freeze–thaw and salt crystallization cycles, among the main causes of deterioration in the region. Petrographic and textural features of these carbonate rocks as well as their porosity resulted to strongly influence their deterioration rate, and their knowledge is, therefore, essential when trying to predict stone decay as a function of the local environmental forcings.
Journal Article
Natural stone and world heritage : the castles and town walls of King Edward in Gwynedd
\"This book is about the stone used to build the castles of Edward I in North West Wales. It provides a description of the available geological resources and the building materials used in the construction of Caernarfon, Conwy, Harlech and Beaumaris Castles. It takes a broad view of this subject, placing the stone used in the castles in the context of both earlier and later buildings across the region of study, from the Neolithic up until the present day\"-- Provided by publisher.
Book
Quantification of surface changes and volume losses of selected rock types due to different cleaning processes
The restorative cleaning of natural stones has a special significance for the preservation of important cultural assets or the slowing of their deterioration. Organisms such as fungi, lichens or mosses, but also emission dirt such as soot soften and otherwise damage both the surface and the internal structure of the building stone. In order to quantify the effects and in particular the abrasiveness of selected cleaning methods, cleaning experiments were carried out on six different naturally and artificially weathered rocks using cold water under high pressure, hot water under high pressure as well as hot-water steam. The types of rocks studied include marble, limestone, granite, sandstone and tuff. Surface changes in roughness and topography were quantified using two surface-sensitive methods: confocal microscopy as well as 3D shadow triangulation. The two high-pressure cleaning methods were found to have a significantly stronger abrasive effect than steam cleaning when the distances were too small. The cleaning performance, which was compared using biologically weathered samples, was lowest for steam cleaning. However, the high temperatures of the steam also permanently eliminate much of the biological matter on and under the surface, as observed in the field test. The results presented should make it possible for the conservator to assess, which cleaning procedures to use for the different rock varieties depending on the degree of weathering.
Journal Article
Development of restoration mortars and artificial stones for use in restoring cultural heritage sites made from volcanic tuffs
Many historically significant buildings and cultural heritage sites are made of volcanic tuffs. These sites are subject to a progressive weathering and are partly in ruinous conditions. Preparing a suitable stone replacement mortar for repair work or even whole replacement stones for these rocks is of great interest. During the quarrying of tuff rocks, more than 40% of the material is rejected and cannot be further used. Utilizing this material, the production of replacement materials with optimized properties for the restoration and repair of severely damaged natural stones represents a resource-saving measure for the preservation of these buildings. In addition to the effective use of the natural stone waste, these artificial materials, in contrast to the very heterogeneous tuffs, offer a constant quality and consistent properties. A more effective exploitation can lead to a more sustainable usage of this natural resource and minimize the interference to the environment. This study describes the development of stone replacement mortars and the creation of artificial replacement stones utilizing source material from Mexico and Armenia. The resulting replacement material shows similar properties, aesthetics, and weathering behavior like the original rock, while different properties could be optimized. Petrophysical properties as well as the weathering behavior of the volcanic tuff rock were analyzed along with the developed replacement mortar and artificial stone. As hydric and thermohydric expansion processes are important factors for the durability of the investigated rocks, replacement materials were developed and optimized which, except for the pore structure of the cement and concrete matrix, show a high correspondence to the natural stones in terms of macroscopic appearance and technical properties. The compatibility of the replacement material with the original rock was investigated. Moreover, based on the evaluation of the mechanical as well as the pore space, water transport and weathering properties, the replacement stones were evaluated as equally suitable construction material, while the replacement mortars vary in regard to their results. Accordingly, the replacement stones developed in this study can be considered as full-fledged rock substitutes for the Armenian tuffs, while the replacement mortars for the Mexican tuffs partly show a good suitability and could be partially optimized.
Journal Article
Petrophysical properties of limestones: influence on behaviour under different environmental conditions and applications
Limestones are of wide variety, namely with differences in the process of formation, mineralogical composition, grain size and texture. Such variability leads to differences in weathering characteristics and behaviour under different environmental conditions and applications. Therefore, detailed studies are mandatory to assess the main factors controlling the physical–mechanical properties and durability to propose the best applications for limestones. This study presents the petrographic and petrophysical data of 11 selected Portuguese limestones. Texture, mineralogy and porosity were identified as key parameters for the durability of limestones. Two main groups were identified regarding the texture/petrography and weathering resistance: the compact micritic limestones and with the sparitic grainstones. For the first time an outstanding bowing behaviour was identified in a limestone, probably related with clay swelling minerals and iron oxides present in the micrite groundmass around or in the stylolitic planes.
Journal Article
Key parameters of volcanic tuffs used as building stone: a statistical approach
Volcanic tuffs naturally show a strong heterogeneity in their petrography and petrophysical properties. The arrangement of the components in tuffs can create a very wide spectrum of porosities and fabrics, which in turn can lead to a highly differential weathering behavior. Considerable amounts of clay minerals and zeolites are common and can contribute to a high sensitivity to expansional processes and salt crystallization. Understanding the influence of the rock properties on material behavior and durability can help to make predictions on future material behavior and evaluate the suitability of the material for construction purposes. This study presents the petrographic and petrophysical data of 15 selected tuffs and 513 tuffs from the literature used as building stones. Regression analysis show if parameters are comparable and if key parameters can be identified. Key parameters can potentially be used for the estimation of the material behavior, without the use of expensive analytics or weathering simulations.
Journal Article