Marine Aerosol Weathering of Mediterranean Calcarenite Stone: Durability of Ethyl Silicate, Nano Ca(OH)2, Nano SiO2, and Nanostructured Consolidating Products

Ainara Zornoza-Indart, Paula Lopez-Arce, Karima Zoghlami, Nuno Leal, Joaquim Simão

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Calcarenite 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.

Original languageEnglish
Pages (from-to)73-89
Number of pages17
JournalStudies in Conservation
Volume64
Issue number2
DOIs
Publication statusPublished - 17 Feb 2019

Keywords

  • durability
  • ethyl silicate
  • marine aerosol weathering
  • nano Ca(OH)
  • nano SiO
  • nanostructured consolidating products
  • Sandstone

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