Accelerate ageing on building stone materials by simulating daily, seasonal thermo-hygrometric conditions and solar radiation of Csa Mediterranean climate

2021 ◽  
Vol 266 ◽  
pp. 121009
Author(s):  
Fabio Sitzia ◽  
Carla Lisci ◽  
José Mirão
Keyword(s):  
Solar Radiation ◽  
Mediterranean Climate ◽  
Building Stone ◽  
Stone Materials ◽  
Accelerate Ageing

New fluorinated acrylic polymers for improving weatherability of building stone materials

1997 ◽  
Vol 32 (1-4) ◽  
pp. 43-50 ◽  
Author(s):  
F Ciardelli ◽  
M Aglietto ◽  
L Montagnini di Mirabello ◽  
E Passaglia ◽  
S Giancristoforo ◽  
...  
Keyword(s):  
Building Stone ◽  
Acrylic Polymers ◽  
Stone Materials

scholarly journals Does bacterial weathering play a significant role in rock weathering?

2021 ◽  
Author(s):  
Adil Binal ◽  
Aylin Sel
Keyword(s):  
Significant Role ◽  
Chemical Elements ◽  
Bacterial Species ◽  
Building Stone ◽  
Rock Weathering ◽  
Experimental Conditions ◽  
Rock Samples ◽  
Rock Types ◽  
Stone Materials ◽  
Biological Weathering

Abstract Bacterial weathering plays a significant role in rock weathering, yet only a limited number of studies was conducted on this topic. The recent rapid developments in geomicrobiology are expected to increase the pace of research in this area. The extent and duration of the biological weathering processes on mineral and rock samples and minerals preferred by bacteria are still not fully understood due to the wide variety of both bacterial species and rock types. Biological weathering of rock types found in Turkey has also not been studied before. Here, we investigated the effects of two species of bacteria actively contributing to rock weathering on three rock types commonly used as building stone materials in Turkey. Granite, andesite, and limestone samples could interact with Bacillus species (B. subtilis and B. pumilus) in closed system reactors. Samples obtained from these reactors were analysed via Scanning Electron Microscopy (SEM) monitoring to identify morphological features and chemical composition changes. Chemical elements consumed most by bacteria were identified. Changes in the colour index were determined via RGB measurements. The effects of experimental conditions on bacterial growth were monitored via daily optical density measurements. The effects of bacteria on the physical properties of rock samples were also evaluated. B. subtilis and B. pumilus were found to be more aggressive on limestone/andesite and granite, respectively.

The influence of season and management system on intake and productivity of confined dairy cows in a Mediterranean climate

1989 ◽  
Vol 49 (3) ◽  
pp. 339-344 ◽  
Author(s):  
J. B. Moran
Keyword(s):  
Heat Stress ◽  
Solar Radiation ◽  
Dairy Cows ◽  
Food Quality ◽  
Management System ◽  
Mediterranean Climate ◽  
Metabolizable Energy ◽  
Intensively Managed ◽  
Access To Shelter ◽  
Friesian Cows

The influence of season and management system on the productivity of Friesian cows in a Mediterranean climate was assessed. Intakes of food and water and milk yields were measured in 154 cows over 2·5 years while intensively managed in yards giving access to shelter (free stalls) or that were fully exposed to solar radiation (open lots). Food quality was also monitored to permit estimates of the efficiency of utilization of metabolizable energy for milk production over fortnightly periods.The highest milk yields and energetic efficiencies were recorded during spring. Energy intakes were highest but energetic efficiencies were lowest during winter. Cows consumed the least food during summer and autumn and drank the most water during summer. The only significant effect of management system was for water intake, which was higher in the open lots than in the free stalls. There was evidence of heat stress in summer and cold stress in winter, but there appeared to be little benefit with milk yields through the provision of shelter.

scholarly journals From Limestone to Sandstone – Building Stone of Theban Architecture During the Reigns of Hatshepsut and Thutmosis III

2020 ◽  
Vol 106 (1-2) ◽  
pp. 215-227
Author(s):  
Christina Karlshausen ◽  
Thierry De Putter
Keyword(s):  
Building Stone ◽  
Middle Kingdom ◽  
Eighteenth Dynasty ◽  
Stone Materials

This paper reviews the monuments built in the Theban area during the reigns of Hatshepsut and Thutmosis III, and their stone materials. This period witnessed a shift from limestone to sandstone in the second part of the Hatshepsut coregency with Thutmosis III, when the queen commissioned an ambitious architectural program. In his autonomous reign, Thutmosis III reused limestone in various monuments, possibly to distance himself from the queen’s choices, and to connect his reign with those of their glorious predecessors in the Middle Kingdom (Mentuhotep II at Deir el-Bahari; Senusret III at Medamud) and in the early Eighteenth Dynasty (Thutmosis I and II).

The Application of Natural Building Stones Material in the Modern Landscape

2013 ◽  
Vol 357-360 ◽  
pp. 2063-2066
Author(s):  
Wen Zhen Li
Keyword(s):  
Building Stone ◽  
Construction Technology ◽  
Application Form ◽  
Rock Composition ◽  
Stone Materials ◽  
Natural Building Stone ◽  
Natural Building Stones ◽  
Basic Characteristics ◽  
Natural Building ◽  
Modern Landscape

Natural building stone is an indispensable element in the landscape construction. This paper introduces the basic characteristics and properties of natural stone, Starting from the classification of natural building stone, Through the stone rock composition and stone of physics, chemistry, decorative research and sum up, In order to form a complete system of landscape designers identify, selection and use of stone materials, Based on this system, further research the stone in modern landscape application form and the construction technology, and discuss the existing problems in the process.

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