Thermal expansion of granitoids

Siegesmund, Siegfried; Sousa, Luís; Knell, Christian

doi:10.1007/s12665-017-7119-2

Cited by 34 publications

(24 citation statements)

References 38 publications

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“…12c), in line with experimental Quartz (65%) Muscovite (15%) Albite (10%) Chlorite (5%) Kaolinite (5%) Fig. 8 UDEC GBM with thermal material properties applied to Voronoi blocks in mineralogical percentages for the Thornhill Rock observations of strength reduction due to thermal loading in similar lithologies (Siegesmund et al 2018;Plevová et al 2011;Zhou et al 2016;Zhang et al 2013). The reduction in strength with thermal loading can be explained through the formation of thermally induced micro-cracks.…”

Section: Laboratory Testingsupporting

confidence: 83%

“…But little work examining the small scale processes underpinning any macroscopic damage related to rock engineering practices exist. Recently Siegesmund et al (2018) studied the thermal expansion of 65 granitic lithologies up to 100 C, with implications for the use of granitoids as building stones and façade materials. Plevová et al (2011) and Zhou et al (2016) both undertook thermal studies on different sandstones.…”

Section: Introductionmentioning

confidence: 99%

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Laboratory Experiments and Grain Based Discrete Element Numerical Simulations Investigating the Thermo-Mechanical Behaviour of Sandstone

et al. 2021

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Thermo-mechanical loading can occur in numerous engineering geological environments, from both natural and anthropogenic sources. Different minerals and micro-defects in rock cause heterogeneity at a grain scale, affecting the mechanical and thermal properties of the material. Changes in strength and stiffness can occur from exposure to elevated temperatures, with the accumulation of localised stresses resulting in thermally induced micro-cracking within the rock. In this study we investigated thermal micro-cracking at a grain scale through both laboratory experiments and their numerical simulations. We performed laboratory triaxial experiments on specimens of fine-grained sandstone at a confining pressure of 5 MPa and room temperature (20$$^{\circ }\hbox {C}$$ ∘ C ), as well as heating to 50$$^{\circ }\hbox {C}$$ ∘ C , 75$$^{\circ }\hbox {C}$$ ∘ C and 100$$^{\circ }\hbox {C}$$ ∘ C prior to mechanical loading. The laboratory experiments were then replicated using discrete element method simulations. The geometry and granular structure of the sandstone was replicated using a Voronoi tessellation scheme to produce a grain based model. Strength and stiffness properties of the Voronoi contacts were calibrated to the laboratory specimens. Grain scale thermal properties were applied to the grain based models according to mineral percentages obtained from quantitative X-ray diffraction analysis on laboratory specimens. Thermo-mechanically coupled modelling was then undertaken to reproduce the thermal loading rates used in the laboratory, before applying a mechanical load in the models until failure. Laboratory results show a reduction of up to 15% peak strength with increasing thermal loading between room temperature and 100$$^{\circ }\hbox {C}$$ ∘ C , and micro-structural analysis shows the development of thermally induced micro-cracking in laboratory specimens. The mechanical numerical simulations calibrate well with the laboratory results, and introducing coupled thermal loading to the simulations shows the development of localised stresses within the models, leading to the formation of thermally induced micro-cracks and strength reduction upon mechanical loading.

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Section: Laboratory Testingsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Laboratory Experiments and Grain Based Discrete Element Numerical Simulations Investigating the Thermo-Mechanical Behaviour of Sandstone

et al. 2021

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“…Alterations effects associated with thermal cycles have been indicated, namely in relation to calcite volumetric variations [78]. We can include in these considerations also a study that presented observations of slight bowing of magmatic rocks under thermal cycles [51]. There are also studies explaining mass loss in tuff and andesite as resulting from mineralogical changes associated with loss of interstitial water of layered minerals because of gas temperature under conditions simulating atmospheric pollution [64].…”

Section: Minerals and Other Phase Constituentsmentioning

confidence: 99%

Rock Features and Alteration of Stone Materials Used for the Built Environment: A Review of Recent Publications on Ageing Tests

2020

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This work presents a review of recent publications, with publication date between 2017 and 2019, with information on the relation between rock characteristics and the effects of diverse agents associated with alteration of stone materials in the built environment. It considers information obtained from ageing tests performed under laboratory conditions and by exposure to outdoor agents. Several lithological groups were considered, with sedimentary carbonate rocks being the most frequently studied lithotypes and silicate metamorphic rocks being the group with scarcer information. In terms of ageing tests, salt weathering was the most frequent one while there was a noticeable lesser amount of information from tests with biological colonization. The collected data showed the influence of diverse features, from specific minerals to whole-rock properties and the presence of heterogeneities. These information are discussed in the context of formulating a general framework for stone decay.

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“…The study of thermal effects on rock properties is an emerging area of research with publications on the thermal behavior of several lithologies, including limestone [7][8][9], sandstone [10,11], and granite [12][13][14]. Besides the mechanical changes, mineralogical changes and other physical transformations are linked to increasing temperature in rocks such as granite [15,16] or especially carbonate rocks such as limestone [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Physical Alteration and Color Change of Granite Subjected to High Temperature

2021

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Cylindrical specimens obtained from the monzogranite host rock of the National Radioactive Waste Repository of Hungary were tested at room temperature and 250 °C, 500 °C, and 750 °C of heat treatment. Reflectance spectra (color), bulk density, Duroskop surface hardness, and ultrasound-wave velocity values were measures before and after thermal stress. According to CIE L*a*b* colorimetric characteristics, the specimens’ color became brighter and yellower after the heat treatment. At 750 °C, a significant volume increase was recorded linked to the formation of macro-cracks, and it also led to the drop in bulk density. Smaller temperature treatment (250 °C) caused a minor decrease in density (−1.3%), which is higher than the reduction of density at 500 °C (−0.8%). Duroskop surface strength showed a slight decrease until 500 °C, and then a drastic decline at 750 °C. P- and S-wave velocity values tend to decrease uniformly and significantly from room temperature to 750 °C. P-wave velocity and Duroskop values have a high exponential correlation at elevated temperatures. Physical alterations originated from the differential thermal-induced expansion of minerals, the formation of micro-cracks. Mineralogical changes at higher temperatures also contribute to the volume change and the loss in strength.

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Thermal expansion of granitoids

Cited by 34 publications

References 38 publications

Laboratory Experiments and Grain Based Discrete Element Numerical Simulations Investigating the Thermo-Mechanical Behaviour of Sandstone

Laboratory Experiments and Grain Based Discrete Element Numerical Simulations Investigating the Thermo-Mechanical Behaviour of Sandstone

Rock Features and Alteration of Stone Materials Used for the Built Environment: A Review of Recent Publications on Ageing Tests

Physical Alteration and Color Change of Granite Subjected to High Temperature

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