Damage Characteristics of Jalore Granitic Rocks After Thermal Cycling Effect for Nuclear Waste Repository

Gautam, Prabhat; Dwivedi, R.; Kumar, Akshay; Kumar, Anil; Verma, A. K.; Singh, T. N.

doi:10.1007/s00603-020-02260-7

Cited by 56 publications

(18 citation statements)

References 44 publications

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“…The thermogravimetry (TG) and differential thermogravimetry (DTG) curves, as graphically plotted in Figure 6 , showed a variation in the mass as a function of temperatures. A significant mass loss was observed at various temperatures less than 200 °C for all rock types that represented the evaporation of physically (absorbed) and chemically bonded water that was liberated at 300 °C [ 34 , 35 , 36 , 37 ]. In this study, the reduction in mass because of the release of physically free (absorbed) and chemically bound water up to 200 °C was found to be 1.949%, 1.210%, 1.093%, 0.164%, 0.471%, 0.257% for Gandonna (a), pink granite (b), buff granite II (d), fantazia (e), rosa granite (g), and qusseir granite (h) at temperatures of 137 °C, 150 °C, 137 °C, 85 °C, 132 °C, and 96 °C, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…A further mass loss was observed with excessive heating between 400 and 800 °C. Such loss in mass was attributed to the releasing of crystal water [ 36 , 37 ] or water-bearing mineral phases [ 34 ].…”

Section: Resultsmentioning

confidence: 99%

“…The rock types buff granite I (c) and red granite (f) showed an inconsiderable mass loss at that range of temperatures, which was confirmed by their thermo-gravimetric derivative peaks at the same figure that indicated a very low rate of mass change by time (%/min.). A further mass loss was observed with excessive heating between 400 and 800 • C. Such loss in mass was attributed to the releasing of crystal water [36,37] or water-bearing mineral phases [34].…”

Section: Thermal Analysis By (Tg/dtg/dsc)mentioning

confidence: 99%

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Relationship of Mineralogical Composition to Thermal Expansion, Spectral Reflectance, and Physico-Mechanical Aspects of Commercial Ornamental Granitic Rocks

2022

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The aim of the present study is to link the thermal expansion, spectral reflectance, and physico-mechanical aspects of different types of commercial granitic rocks with their mineralogical and chemical composition. The granitic rock types were characterized using several analyses, including petrography, chemical, mineralogical, and thermo-gravimetrical analysis using XRF, XRD, and TG/DTG/DSC techniques. The rock types were subjected to several performance tests, such as tests of their thermal expansion, spectral reflectance, and physico-mechanical properties. The results revealed that quartz, albite, and potash feldspar with minor amounts of mica (biotite/muscovite/annite) are the main mineralogical constitutes, in addition to some alteration minerals, such as kaolinite, saussorite, and prehnite. The studied granitic rocks were classified as monzogranite/syenogranite of high K-calc-alkaline and peraluminous characters and are related to late- to post-collisional settings. The thermogravimetrical analysis revealed that the overall mass loss over the whole temperature range up to 978 °C did not exceed 3% of the initial weight for all studied rocks. The results of thermal expansion revealed that the maximum change in linear thermal expansion for all rock types did not exceed 0.015% of their initial lengths at an unusual air temperature of 50 °C. The spectral analysis revealed that iron and hydroxyl ions are the main spectral absorption features that appeared in the VIS-NIR and SWIR regions, in addition to the appearance of the common and distinctive absorption peaks of the main mineral composition. Furthermore, the spectral reflectance demonstrated that the granitic rock types of low iron oxide content achieved a high reflectivity percent in the VIS-NIR and SWIR spectral regions compared with those of high iron content. As a general trend, the granitic rock types of high iron content and/or lower quartz content exhibited a high performance regarding their physical and mechanical properties, such as water absorption, apparent porosity, bulk density, compressive strength, and abrasion resistance. The results of water absorption, density, strength, and abrasion resistance of the studied granitic rocks are in the range of 0.14–0.31%, 2582–2644 kg/m3, 77.85–222.75 MPa, and 26.27–55.91 Ha, respectively, conforming to the requirements of ornamental stones according to the ASTM standard.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Thermal Analysis By (Tg/dtg/dsc)mentioning

confidence: 99%

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Relationship of Mineralogical Composition to Thermal Expansion, Spectral Reflectance, and Physico-Mechanical Aspects of Commercial Ornamental Granitic Rocks

2022

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“…In addition, the microcracks induced by thermal cycling reduce the bonding force between minerals, which further reduce the strength of the specimen and induce the generation of more small fragments and fine powder after impact failure (Gautam et al 2021).…”

Section: Micromechanism Explanationmentioning

confidence: 99%

Thermal cycling effects on the dynamic behavior of granite and microstructural observations

Gao

Fan

Wan

2021

Bull Eng Geol Environ

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This study investigated the thermal cycling effects on the dynamic behavior of granite and described its microstructure. The specimens were subjected to various numbers of thermal cycles (0, 1, 3, 5, and 7 cycles) at temperatures ranging from 25 to 500 °C. Then, ultrasonic wave tests and split Hopkinson pressure bar (SHPB) tests (with different impact gas pressures of 0.25, 0.28, and 0.31 MPa) were performed to study the thermal cycling effects on the P-wave velocity, P-wave modulus, dynamic compressive strength, and impact failure pattern of the granite specimens. Finally, scanning electron microscopy (SEM) was performed to analyze the micromechanism of the dynamic property degeneration of the granite specimens. The results show that the dynamic properties of the P-wave velocity, P-wave modulus, and dynamic compressive strength exponentially decrease as the number of thermal cycles increases. The decreases in the dynamic properties mainly occur during the first thermal cycle, and the P-wave modulus and dynamic strength decrease by 67.5% and 8.4-16.3%, respectively. Moreover, a higher dynamic compressive strength, smaller fragments, and more fine powder are generated by impact failure with a larger strain rate. Smaller fragments and more fine powder are observed after impact failure as the number of thermal cycles increases. The tests further reveal that the dynamic properties of thermally damaged granite are closely related to the microcracks induced by thermal cycling.

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“…e results showed that the microcracks in the marble were primarily intergranular cracks, the length and width of which increased with the number of cycles. Gautam et al [6] analyzed the variations in damage of different granites at 250 °C when the cycle times were varied. e results showed that the tensile strength and elasticity modulus of different types of granites both decreased with the increase of the number of cycles.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Mechanical Damage and Fracture Characteristics of Granite under Different Water Cooling Conditions

Yao

Zhang

et al. 2021

Shock and Vibration

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In order to investigate the mechanical property deterioration and fracture characteristics of granite under different temperature drop and thermal cycle conditions, the evolution laws of mechanical properties, acoustic emission event distribution, and macro and micro failure characteristics of granite under different temperature changes were studied and analyzed by the servo loading, acoustic emission monitoring, and scanning electron microscope systems. The following conclusions were gained from the test results. (1) The peak stress and elasticity modulus of the three temperature drop treatments all decreased with the increase of the number of thermal cycles. In terms of magnitude, the following relationship was satisfied: 10°C > 15°C > 20°C. After 8 cycles, the peak stress and elasticity modulus tended to be stable for 15°C and 20°C temperature drops. (2) At a temperature drop of 20°C, the heterogeneity first increased and then tended to be stable; when the temperature was dropped by 15°C at each cycle, however, the heterogeneity first decreased and then became stable; as for the case of 10°C, the heterogeneity showed an overall decreasing trend. After 4 cycles, the heterogeneities were ranked as 15°C > 20°C > 10°C. After 8 cycles, 20°C > 15°C > 10°C. (3) With the decrease of temperature drop amplitude or the increase of cycles, the connectivity of microcracks in granite improved on the whole, the aperture and shape factor of microcracks increased, the damage of granite intensified, and the duration of the quiet period in the acoustic emission ringing count rate prolonged. (4) The tensile failure dominated at a temperature drop amplitude of 10°C. When the temperature drop was 15°C, the failure mode transitioned from hybrid tension-shear failure to tensile failure as the cycle times increased, whereas the hybrid tension-shear failure dominated with a temperature drop of 20°C.

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Damage Characteristics of Jalore Granitic Rocks After Thermal Cycling Effect for Nuclear Waste Repository

Cited by 56 publications

References 44 publications

Relationship of Mineralogical Composition to Thermal Expansion, Spectral Reflectance, and Physico-Mechanical Aspects of Commercial Ornamental Granitic Rocks

Relationship of Mineralogical Composition to Thermal Expansion, Spectral Reflectance, and Physico-Mechanical Aspects of Commercial Ornamental Granitic Rocks

Thermal cycling effects on the dynamic behavior of granite and microstructural observations

Experimental Study on Mechanical Damage and Fracture Characteristics of Granite under Different Water Cooling Conditions

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