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Fire resistance of the Mt. Epomeo Green Tuff, a widely-used building stone on Ischia Island (Italy)
- Source :
- Volcanica, Volcanica, Presses Universitaires de Strasbourg, 2018, 1 (1), pp.33-48. ⟨10.30909/vol.01.01.3348⟩, Volcanica, Vol 1, Iss 1, Pp 33-48 (2018)
- Publication Year :
- 2018
- Publisher :
- Presses Universitaires de Strasbourg, 2018.
-
Abstract
- The use of Mt. Epomeo Green Tuff (MEGT) as a building stone is widespread on Ischia Island (Italy). We assess here the fire resistance of MEGT by thermally stressing samples to temperatures up to 1000 °C. Porosity and uniaxial compressive strength increase and decrease from 44% and 4.5 MPa at ambient temperature to 48% and 1.5 MPa following exposure to 1000 °C, respectively. Complementary thermogravimetric and X-ray powder diffraction analyses, experiments that monitor acoustic emissions during heating/cooling, and microstructural observations highlight that these changes are the result of thermal microcracks, formed due to the breakdown of zeolites and clays (MEGT contains 35 wt.% analcime, 15 wt.% smectite, and 3 wt.% illite) at high temperature. Although the stability of structures built from MEGT will be jeopardised at high temperature, a very low thermal diffusivity requires that fires must burn for many hours to compromise the strength of a typical dimension stone: tuffs are tough in the event of fire.
- Subjects :
- Thermogravimetric analysis
Materials science
010504 meteorology & atmospheric sciences
Analcime
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]
engineering.material
010502 geochemistry & geophysics
Thermal diffusivity
01 natural sciences
Tuff
Uniaxial compressive strength
acoustic emissions
microcracks
Dimension stone
Porosity
0105 earth and related environmental sciences
QE1-996.5
Metallurgy
Geology
Fire
Compressive strength
13. Climate action
Thermogravimetry
Illite
engineering
Strength
Clay minerals
Subjects
Details
- Language :
- English
- ISSN :
- 26103540
- Database :
- OpenAIRE
- Journal :
- Volcanica, Volcanica, Presses Universitaires de Strasbourg, 2018, 1 (1), pp.33-48. ⟨10.30909/vol.01.01.3348⟩, Volcanica, Vol 1, Iss 1, Pp 33-48 (2018)
- Accession number :
- edsair.doi.dedup.....85c037a57f8b9802b98da5311eb1d2dd