Effect of Microstructure and Relative Humidity on Strength and Creep of Gypsum
| Autor: | Chiara Caselle, Daniele Costanzo, Sabrina Maria Rita Bonetto, Eduardo Alonso, A. Ramon |
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| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental, Universitat Politècnica de Catalunya. MSR - Mecànica del Sòls i de les Roques |
| Rok vydání: | 2021 |
| Předmět: |
Gypsum
Materials science Constitutive equation 0211 other engineering and technologies 02 engineering and technology engineering.material 010502 geochemistry & geophysics 01 natural sciences Creep strain Enginyeria civil::Geotècnia::Mecànica de roques [Àrees temàtiques de la UPC] Relative humidity Geotechnical engineering Creep Gypsum rock Microstructure 021101 geological & geomatics engineering 0105 earth and related environmental sciences Civil and Structural Engineering Geology Geotechnical Engineering and Engineering Geology Strength of materials Guix Facies engineering |
| Zdroj: | UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) |
| ISSN: | 1434-453X 0723-2632 |
| Popis: | The wide range of gypsum facies observed all over the world and the strong heterogeneity that may be present even within a single facies often cause an inhomogeneous mechanical response that, if neglected, may be particularly dangerous in the framework of underground excavations. In addition, gypsum is particularly sensible to the presence of water. The high relative humidity conditions often registered in underground gypsum quarries may imply an additional worsening of mechanical properties. In the present study, the strength and the creep response of a natural gypsum rock facies are investigated, considering the influence of material heterogeneity and relative humidity conditions. The heterogeneity of the material, quantified with MIP and SEM analyses, is observed to strongly affect the mechanical response. To this intrinsic mechanical variability, the influence of an external parameter as the relative humidity is observed to generate an additional reduction of material strength and to increase the creep strain rate in the long-term tests. The effect of all these elements in the underground quarry framework is discussed and a constitutive model of these experimental results is provided. Open access funding provided by Università degli Studi di Torino within the CRUI-CARE Agreement. |
| Databáze: | OpenAIRE |
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