Marine Aerosol Weathering of Mediterranean Calcarenite Stone: Durability of Ethyl Silicate,Nano Ca(OH)2, Nano SiO2, and Nanostructured Consolidating Products |
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| Authors: | Ainara Zornoza-Indart Paula Lopez-Arce Karima Zoghlami Nuno Leal Joaquim Simão |
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| Institution: | 1. Restoration of Historical Constructions, Urban Evolution and Refurbishment, Doctoral Programme, H.T.S. Architecture, University of the Basque Country (UPV/EHU), Donostia-San Sebastian, Spain;2. Department of Painting, Faculty of Fine Arts, University of the Basque Country (UPV/EHU), Lejona, Spainainara.zornoza@ehu.eus;4. School of Environment, Energy and Resources, Faculty of the Built Environment, Institute for Environmental Design and Engineering (IEDE), The Bartlett, University College London (UCL), London, UK;5. Property Care Association, Huntingdon, Cambridgeshire, UK;6. Faculty of Sciences of Tunis, Department of Geology, Laboratoire de resources minerales et environnement, University Tunis el Manar, El Manar, Tunis;7. GeoBioTec – GeoBioSciences, GeoTechnologies and GeoEngineering, Faculty of Sciences and Technology, NOVA University of Lisbon, Caparica, Portugal |
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| Abstract: | ABSTRACTCalcarenite stone samples from a historic building (Bizerte, Tunisia) were collected and treated under different environmental conditions with several consolidating products: alkoxysilane (ethyl silicate), a surfactant-templated novel sol–gel, Ca(OH)2, and SiO2 nanoparticles. These were subjected to marine aerosol accelerated aging cycles and studied by several non-destructive tests and techniques to assess the stability of the products. Results show that weathering caused by salt crystallization is not inhibited but it is slowed down due to the enhancement of superficial mechanical properties (surface cohesion and micro-hardness) achieved after one month of treatments application. A high or low relative humidity of the consolidation environment significantly affects the final mechanical and aesthetical physical properties and therefore conditions the durability of the treated substrates, even producing higher damage than observed in the blank specimens, depending on the product. |
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| Keywords: | Sandstone marine aerosol weathering durability ethyl silicate nano Ca(OH)2 nano SiO2 nanostructured consolidating products |
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