scholarly journals Effect of the mineralogical composition on the elastoplastic hydromechanical response of Opalinus Clay shale

2021 ◽  
Vol 143 ◽  
pp. 104747
Author(s):  
Eleonora Crisci ◽  
Alessio Ferrari ◽  
Silvio B. Giger ◽  
Lyesse Laloui
Keyword(s):  
Mineralogical Composition ◽  
Opalinus Clay ◽  
Clay Shale

scholarly journals The response of Opalinus Clay when exposed to cyclic relative humidity variations

2016 ◽  
Author(s):  
Katrin M. Wild ◽  
Patric Walter ◽  
Florian Amann
Keyword(s):  
Tensile Strength ◽  
Relative Humidity ◽  
Environmental Changes ◽  
Opalinus Clay ◽  
Brazilian Tensile Strength ◽  
Internal Damage ◽  
Direction Parallel ◽  
Clay Shale ◽  
Retention Characteristic ◽  
Bedding Planes

Abstract. Clay shale specimens were exposed to cyclic relative humidity variations to investigate the response of the material to natural environmental changes. Opalinus Clay, a clay shale chosen as host rock for nuclear waste disposal in Switzerland, was utilized. The specimens were exposed to stepwise relative humidity cycles where they were alternately allowed to equilibrate at 66 and 93 % relative humidity. Principal strains were monitored throughout the experiments using strain gauges. After each relative humidity cycle, Brazilian tensile strength tests were performed to identify possible changes in tensile strength due to environmental degradation. Results showed that Opalinus Clay follows a cyclic swelling-shrinkage behaviour with irreversible expansion limited to the direction normal to bedding, suggesting that internal damage is restricted along the bedding planes. The Brazilian tensile strength in direction parallel and normal to bedding as well as the water retention characteristic remained unaffected by the RH variations.

Hydro-mechanical behaviour of shallow Opalinus Clay shale

2019 ◽  
Vol 251 ◽  
pp. 214-227 ◽  
Author(s):  
Eleonora Crisci ◽  
Alessio Ferrari ◽  
Silvio B. Giger ◽  
Lyesse Laloui
Keyword(s):  
Mechanical Behaviour ◽  
Opalinus Clay ◽  
Clay Shale

The shear strength of Opalinus Clay shale in the remoulded state

2020 ◽  
Vol 21 ◽  
pp. 100142 ◽  
Author(s):  
A. Ferrari ◽  
M. Rosone ◽  
M. Ziccarelli ◽  
S.B. Giger
Keyword(s):  
Shear Strength ◽  
Opalinus Clay ◽  
Clay Shale

scholarly journals Benchmark study of undrained triaxial testing of Opalinus Clay shale: Results and implications for robust testing

2021 ◽  
Vol 25 ◽  
pp. 100210
Author(s):  
Alberto Minardi ◽  
Silvio B. Giger ◽  
Russell T. Ewy ◽  
Rudy Stankovic ◽  
Jørn Stenebråten ◽  
...  
Keyword(s):  
Opalinus Clay ◽  
Triaxial Testing ◽  
Clay Shale ◽  
Benchmark Study ◽  
Robust Testing

scholarly journals The response of Opalinus Clay when exposed to cyclic relative humidity variations

Solid Earth ◽  
2017 ◽  
Vol 8 (2) ◽  
pp. 351-360 ◽  
Author(s):  
Katrin M. Wild ◽  
Patric Walter ◽  
Florian Amann
Keyword(s):  
Tensile Strength ◽  
Relative Humidity ◽  
Environmental Changes ◽  
Opalinus Clay ◽  
Brazilian Tensile Strength ◽  
Internal Damage ◽  
Direction Parallel ◽  
Clay Shale ◽  
Retention Characteristic ◽  
Bedding Planes

Abstract. Clay shale specimens were exposed to cyclic relative humidity (RH) variations to investigate the response of the material to natural environmental changes. Opalinus Clay, a clay shale chosen as host rock for nuclear waste disposal in Switzerland, was utilized. The specimens were exposed to stepwise relative humidity cycles in which they were alternately allowed to equilibrate at 66 and 93 % relative humidity. Principal strains were monitored throughout the experiments using strain gauges. After each relative humidity cycle, Brazilian tensile strength tests were performed to identify possible changes in tensile strength due to environmental degradation.Results showed that Opalinus Clay follows a cyclic swelling–shrinkage behaviour with irreversible expansion limited to the direction normal to bedding, suggesting that internal damage is restricted along the bedding planes. The Brazilian tensile strength in direction parallel and normal to bedding as well as the water retention characteristic remained unaffected by the RH variations.

On the hydro-mechanical behaviour of remoulded and natural Opalinus Clay shale

2016 ◽  
Vol 208 ◽  
pp. 128-135 ◽  
Author(s):  
Valentina Favero ◽  
Alessio Ferrari ◽  
Lyesse Laloui
Keyword(s):  
Mechanical Behaviour ◽  
Opalinus Clay ◽  
Clay Shale

Anisotropic volumetric behaviour of Opalinus clay shale upon suction variation

2016 ◽  
Vol 6 (2) ◽  
pp. 144-148 ◽  
Author(s):  
A. Minardi ◽  
E. Crisci ◽  
A. Ferrari ◽  
L. Laloui
Keyword(s):  
Opalinus Clay ◽  
Clay Shale

Applications of SEM/EDXA in cement clinker investigation

1990 ◽  
Vol 48 (4) ◽  
pp. 870-871
Author(s):  
Arezki Tagnit-Hamou ◽  
Shondeep L. Sarkar
Keyword(s):  
Mineralogical Composition ◽  
Physicochemical Characteristics ◽  
Cement Clinker ◽  
Accurate Information ◽  
Phase Identification ◽  
History Of ◽  
Bulk Chemical ◽  
Resolution Imaging ◽  
Proven Method ◽  
Instantaneous Chemical

All the desired properties of cement primarily depend on the physicochemical characteristics of clinker from which the cement is produced. The mineralogical composition of the clinker forms the most important parameter influencing these properties.Optical microscopy provides reasonably accurate information pertaining to the thermal history of the clinker, while XRDA still remains the proven method of phase identification, and bulk chemical composition of the clinker can be readily obtained from XRFA. Nevertheless, all these microanalytical techniques are somewhat limited in their applications, and SEM/EDXA combination fills this gap uniquely by virtue of its high resolution imaging capability and possibility of instantaneous chemical analysis of individual phases.Inhomogeneities and impurities in the raw meal, influence of kiln conditions such as sintering and cooling rate being directly related to the microstructure can be effectively determined by SEM/EDXA. In addition, several physical characteristics of cement, such as rhcology, grindability and hydraulicity also depend on the clinker microstructure.

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