Characterisation of a centuries-old patinated copper roof tile from Queen Anne's Summer Palace in Prague

2017 ◽  
Vol 133 ◽  
pp. 146-155 ◽  
Author(s):  
M. Morcillo ◽  
T. Chang ◽  
B. Chico ◽  
D. de la Fuente ◽  
I. Odnevall Wallinder ◽  
...  
Keyword(s):  
2020 ◽  
Vol 60 (1) ◽  
pp. 128-156
Author(s):  
Wong Wai Yee Sharon ◽  
Ea Darith ◽  
Chhay Rachna ◽  
Tan Boun Suy
Keyword(s):  

2021 ◽  
Author(s):  
Maulida Rahayu ◽  
Sujito ◽  
Edy Wibowo ◽  
S. Sutisna
Keyword(s):  
The Self ◽  

2016 ◽  
Vol 34 (2) ◽  
pp. 135-149 ◽  
Author(s):  
Chiemi Iba ◽  
Ayumi Ueda ◽  
Shuichi Hokoi

Purpose – Frost damage is well-known as the main cause of roof tile deterioration. The purpose of this paper is to develop an analytical model for predicting the deterioration process under certain climatic conditions. This paper describes the results of a field survey conducted to acquire fundamental information useful to this aim. Design/methodology/approach – A field survey of roof tile damage by freezing was conducted in an old temple precinct in Kyoto, Japan. Using detailed observations and photographic recordings, the damage progress was clarified. To examine the impact of climatic conditions upon the damage characteristics, weather data and roof tile temperatures were measured and logged in the winter season. Findings – The deterioration process was observed under the climatic conditions associated with the measured temperature of the roof tiles. In particular, it was revealed that the orientation has a significant influence on increasing or decreasing the risk of frost damage. For certain distinctive forms of damage, the deterioration mechanisms were estimated from the viewpoint of the moisture flow and temperature distribution in the tile. Originality/value – This study contributes to the elucidation of the mechanism behind frost damage to roof tiles. The findings will guide the construction of a numerical model for frost damage prediction.


2015 ◽  
Vol 18 (suppl 2) ◽  
pp. 63-69 ◽  
Author(s):  
Alessandra Savazzini dos Reis ◽  
Viviana Possamai Della-Sagrillo ◽  
Francisco Rolando Valenzuela-Diaz

Author(s):  
Marwa Ahmed ◽  
M. F. Abadir ◽  
Ayman Yousef ◽  
K. A. M. El-Naggar

Abstract Aluminum slag waste generated from the smelting process of bauxite was used to prepare roof tiles samples. Clay was substituted by slag waste in percentages reaching 40% in the basic mix and the plasticity of the obtained mud was determined. This was followed by pressing the mud in steel molds and drying. The effect of waste addition on drying shrinkage was subsequently assessed. Firing of the green bodies was carried out at three temperatures (900, 1000 and 1100oC) and hour soaking at each temperature. Fired roof tile properties improved on increasing the percentage of alumina sludge and firing temperature possibly because of the presence of high amounts of fluxing oxides in aluminum slag. This caused a drop in porosity that increased the mechanical strength of tiles. The results showed that the substitution of clay by 40% waste and firing at 1100oC resulted in products conforming to ASTM C-1167 for clay type roof tiles. Cold water absorption dropped to 12%, below the maximum permissible limit of 15%, the value of Saturation Coefficient was 0.83, below the 0.86 limit and the obtained breaking strength of 3370N significantly exceeded the minimum requirement of 890N.


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