Evaluation of the Impact of Nano-Absorptive Waterproofing on the Reduction of Water Absorption in Sand-Cement Mortar Used in the Historical Restoration of Persepolis

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Meshkinfam Fard Habib; Talebian Mohammad Hassan

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Journal Paper

Paper Information

Journal: KNOWLEDGE OF CONSERVATION AND RESTORATION JOURNAL Year:2024 | Volume:7 | Issue:1 Page(s): 1-20

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Title

Evaluation of the Impact of Nano-Absorptive Waterproofing on the Reduction of Water Absorption in Sand-Cement Mortar Used in the Historical Restoration of Persepolis

Author(s)

Meshkinfam Fard Habib | Talebian Mohammad Hassan | Issue Writer Certificate

Keywords

Persepolis

Stone Conservation

Nanotechnology

Cement Mortar

Waterproofing.

Abstract

The structure of Persepolis is subjected to various factors that cause erosion and decay due to moisture. The cement mortars used in past restorations are one of the challenges in preserving this grand stone monument. Over time, these mortars, due to higher water absorption than the stone, have exacerbated the destructive effects of moisture, causing serious but gradual and irreversible damage. Since removing these mortars and replacing the past restorative measures to improve the current situation is extremely difficult and may have damaging consequences for these valuable artifacts, this research aims to evaluate the impact of nano waterproof coatings on reducing the moisture absorption of the used cement mortars through comprehensive studies on the current state of these monuments and the restorations carried out with cement. Therefore, this research aims to provide a suitable solution without needing to remove the cement mortar and with minimal intervention to protect these artifacts. This study employs an experimental research method and considers theoretical concepts within laboratory studies. In this process, two types of Iranian and foreign nano waterproof coatings named Zycosil Max and FarazSil were applied on similar cement mortar samples, and their permeability and water absorption were evaluated using water absorption percentage and capillarity tests. The results showed that both waterproof coatings effectively reduced the cement mortar's water absorption. Zycosil Max, with a performance of 60.5%, and Faraz Sil, with a performance of 48.02%, significantly reduced the water absorption of the cement mortar, with Zycosil Max showing better performance than FarazSil. However, considering that the water absorption percentage did not reach close to that of the stone samples of Persepolis and the more than tenfold difference in water absorption percentage, none of the studied materials are recommended for waterproofing the cement mortar used in the restoration of the Persepolis monument.

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