Differential thermal expansion as a cause of salt decay: literature review, experiments, and modelling of micro and macro effects on Ançã limestone
| Autor: | Teresa Diaz Gonçalves, Vânia Brito |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
chemistry.chemical_classification
Sodium 0211 other engineering and technologies Mineralogy Salt (chemistry) chemistry.chemical_element 02 engineering and technology Conservation 010502 geochemistry & geophysics 01 natural sciences Thermal expansion Salt decay chemistry.chemical_compound chemistry Sodium nitrate visual_art 021105 building & construction visual_art.visual_art_medium Ceramic Composite material Mortar Porous medium 0105 earth and related environmental sciences |
| Zdroj: | Studies in Conservation. 62:310-328 |
| ISSN: | 2047-0584 0039-3630 |
| DOI: | 10.1080/00393630.2016.1140860 |
| Popis: | Salt decay is one of the harshest, most frequent, and more complex types of decay of porous materials in built heritage, including natural stones, ceramics, and mortars. In this article, we address the mechanism of thermal expansion, which is one of the least studied, yet most controversial, of those proposed over time to explain salt decay. We present a review of scientific literature on the topic, followed by a study of the effects of thermal expansion on a specific material, the well-known Anca limestone. The study included experimental measurement of the linear thermal expansion coefficient of the Anca, both in its natural state and with varying contents of sodium chloride, sodium sulphate, or sodium nitrate. The results show that this coefficient: (i) is significantly higher when the stone is contaminated with salt; and (ii) scales approximately with the amount of salt contained in the stone pores, regardless of the type of salt. Based on these results and on modelling of damage modes at the microsco... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|