Stone deterioration and conservation by Prof. Enrico Sassoni
ฝัง
- เผยแพร่เมื่อ 18 ก.ย. 2024
- Speaker: Prof. Enrico Sassoni, University of Bologna, Italy
Hosts: Dr Prannoy Suraneni, University of Miami, United States and Prof. Karen Scrivener, EPFL, Switzerland
Title : Stone deterioration and conservation
Stone has been extensively used in historic buildings and sculptures, both for structural and decorative purposes. When exposed outdoors, stone suffers from several deterioration processes (dissolution in rain, thermal cracking, bowing of thin slabs, soiling, stress from crystallization of salts and ice, swelling of clays), many of which are predicted to be worsened by climate change. To arrest and prevent stone deterioration, conservation treatments may include the application of consolidants and protectives, namely liquid products that, after hardening, re-establish the cohesion of the stone and form a surface layer with reduced solubility, respectively. Although in several cases satisfactory results can be obtained, still traditional products (such as ethyl silicate, dispersions of lime nanoparticles, organic polymers) often exhibit limitations, especially when applied onto carbonate stones such as marble and limestone. For this reason, research on innovative treatments is ongoing. In the last 10 years, very encouraging results have been obtained by a new approach, based on aqueous solutions of ammonium phosphate. In this talk, after reviewing the main causes of deterioration of stone, the performance of traditional products and ammonium phosphate will be presented and discussed, in terms of the most important requirements (effectiveness, compatibility, durability and sustainability), considering both laboratory studies and field experiences.
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The mission of RILEM is to advance scientific knowledge related to construction materials, systems and structures and to encourage transfer and application of this knowledge world-wide.
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