Poster

Shekofteh, Atefeh; Molina Piernas, Eduardo; Arizzi, Anna; Rueda Quero, Lucía; Cultrone, Giuseppe; Oudbashi, Omid:

Consolidation assessment of two inorganic materials on the beige limestone used in Pasargadae (Word Heritage Site in Iran)

2018

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Pasargadae Wolrd Heritage Site related to Achaemenid period in Iran (6th century BC). Pasargadae was built using three different types of limestone which differ in color. In this study, beige limestone has been chosen for consolidation treatment because of its decay, as in scaling and peeling. Two products; nano-lime and ammonium phosphate were considered to consolidate the limestone. These two inorganic products are very promising due to their compatibility with limestone as well as their water solubility and absence of toxicity. Consolidation treatment was conducted on samples from quarry and applied by brush with 50% nano-lime dispersion in isopropyl alcohol and a 1.0 M dibasic ammonium phosphate (DAP, (NH4)2HPO4) water solution. The treatment effects were evaluated in terms of superficial consolidation with a micro-drilling test and in terms of color changes by spectrophotometry. The microstructure treated was observed by scanning with an electron microscope (SEM). In both treatments, the results indicate an increase of superficial resistance. The resistance increase in 10 days after treatment was similar in both. On the contrary, spectrophotometry revealed some yellowish color in samples treated with DAP that is a negative for using on bright stones. Through SEM observation, some micro-cracks ewere detected in the surface, especially in those samples treated with DAP. In conclusion, nano-lime material seems more compatible for beige limestone according to the aesthetic (color and lightness) as well as homogeneous layer that probably is sufficient for open-air archaeological architectures. In future, the long-term efficiency of these products should be taken into consideration.

 
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Consolidation and Communication. Materials and Methods for the Consolidation of Cultural Heritage: An Interdisciplinary Dialogue.
HAWK University of Applied Sciences and Arts Hildesheim/Holzminden/Göttingen, Hildesheim 25-27 January 2018

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This work is licensed under a Creative Commons BY-NC-ND 3.0 Germany License.

DOI (Digital Object Identifier)

10.5165/hawk-hhg/363

Related Website

http://www.hornemann-institut.de/english/Consolidation.php