Thermal damage pattern and thresholds of granite

Sun, Qiang; Zhang, Weiqiang; Xue, Lei; Zhang, Zhizhen; TianMing, Su

doi:10.1007/s12665-015-4234-9

Cited by 167 publications

(44 citation statements)

References 32 publications

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“…Equation (5) shows that the mean crack aperture (2 ) changes linearly with the porosity. Thus, the mean aperture also decreases 44% as temperature increases from 15 ∘ C to 40 ∘ C. The porosity change due to the thermal effect is also found by Sun et al [38], who found that the porosity of granite decreases (from 0.88% to 0.75%) as temperature increases (from 25 ∘ C to 50 ∘ C) in the moderate temperature range. Comparing with the influence of the moderate pressure on the permeability presented above, the thermal effect on the permeability is notable and it should be taken into account into the estimation of the transport properties of intact rock.…”

Section: Test Results Analysissupporting

confidence: 77%

Investigating the Permeability of Marble under Moderate Pressure and Temperature

et al. 2017

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The permeability of intact marble samples collected from the depth of 1.6 km in southwestern China is investigated under moderate confining pressures and temperatures. No microcracks initiate or propagate during the tests, and the variation of permeability is due to the change of aperture of microcracks. Test results show a considerable decrease of permeability along with confining pressure increase from 10 to 30 MPa and temperature increase from 15 to 40 ∘ C. The thermal effect on the permeability is notable in comparison with the influence of the stress. A simple permeability evolution law is developed to correlate the permeability and the porosity in the compressive regime based on the microphysical geometric linkage model. Using this law, the permeability in the compressive regime for crystalline rock can be predicted from the volumetric strain curve of mechanical tests.

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Section: Test Results Analysissupporting

confidence: 77%

Investigating the Permeability of Marble under Moderate Pressure and Temperature

et al. 2017

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“…The TG curve demonstrates three distinct phases. In the first phase (from 25 to 250 °C), the gentle weight loss is normally attributed to the removing of adsorbed water from room temperature to 100 °C [26] and later some crystal water is released from crystal lattices [27]. Then more crystal water and structural water of minerals escape in phase 2 (from 250 to 530 °C) [26].…”

Section: Sample Propertiesmentioning

confidence: 99%

“…In the first phase (from 25 to 250 °C), the gentle weight loss is normally attributed to the removing of adsorbed water from room temperature to 100 °C [26] and later some crystal water is released from crystal lattices [27]. Then more crystal water and structural water of minerals escape in phase 2 (from 250 to 530 °C) [26]. In the last phase (from 530 to 800 °C), the sharp decline in mass around 600 °C is identified as the process of dehydroxylation of biotite [28].…”

Section: Sample Propertiesmentioning

confidence: 99%

“…According to the above analysis, it could be inferred the mechanical properties damage process. Due to the damage of mineral for water losing [26,27] under 600 °C, the strength drops slowly for the damage is not serious. Then the quartz phase transition at 573 °C causes structural changes and higher thermal stress [15], meanwhile the thermal expansion mismatch would be more severe with increasing temperature.…”

Section: Compressive Strengthmentioning

confidence: 99%

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The thermal damaging process of diorite under microwave irradiation

Yuan

Zeng

et al. 2018

Frattura Ed Integrità Strutturale

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Laboratory tests have been conducted to investigate the effects of thermal damage on diorite under microwave irradiation. The sample rocks were heated to high temperature range of 300 to 800 ℃ in a single-mode microwave furnace. The experimental results show that the rocks started to crack at 500 ℃ and completely disintegrated at 700 ℃. The intensities of quartz diffraction peaks were almost unchanged while the diffraction peak intensity of hornblende gradually decreased with temperature increasing. In addition, the chlorite diffraction peak disappeared at 500 ℃. The compressive strength of the sample decreased to 40% at 600 ℃ and it approached zero at 700 ℃. In this paper, the possible reasons for the thermal effects on the fracture of diorite were discussed, which can be related to water evaporation,

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“…Extensive experiments have been carried out to investigate the failure mechanism of rock specimens in laboratory scale subjected to high temperature, especially the granite which is one of the various rock types encountered when geothermal resources development (David et al, 1999;Yoshitaka et al, 2010;Vázquez et al, 2015;Gautam et al, 2016). And many authors have done thermal tests in building stones and these thermal tests generated fissures (Wang et al, 2015;Sun et al, 2015;Freire-Lista et al, 2016;Zhu et al, 2016;Murru et al, 2018). These studies proved that the macroscopic swelling strain is the combined results of local free swelling strains and additional mechanical strains induced by these interactions.…”

mentioning

confidence: 99%

Effects of pre-existing fissures on surface macro-crack characteristics of granite subjected to elevated temperatures

Zhao¹

2019

Acta Geodynamica Et Geomaterialia

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In order to study thermal macro-cracks on granite surface, experiments were conducted to heat orthoclase granite samples under 25-800 °C. This paper reports a method for evaluating thermal damage of rock by indexes of thermal macro-cracks characteristics, including the width of macro-cracks, the length of macro-cracks, the density of macro-cracks and fractal analysis of macro-cracks. The major findings are as follows: (1) As treatment temperature increases from 500 °C to 800 °C, the average macro-crack width increases from 0.05 to 0.22 mm. And the average macro-crack length increases from 34.36 to 771.86 mm at 600-800 °C. In addition, the linear density is from 0.20 to 1.05 mm-1 and the surface density increases from 0.07 to 1.54 mm/mm 2 at 600-800 °C. (2) The temperature has an important influence on the thermal fracture fractal of the granite surface. As treatment temperature increases from 600 °C to 800 °C, the fractal dimension of macro-cracks changes from 0.47 to 1.43. (3) 400-500 °C is the threshold temperature of the thermal macro-cracks generated on the granite surface and the high temperature causes the unpenetrated fissures connect with each other.

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Thermal damage pattern and thresholds of granite

Cited by 167 publications

References 32 publications

Investigating the Permeability of Marble under Moderate Pressure and Temperature

Investigating the Permeability of Marble under Moderate Pressure and Temperature

The thermal damaging process of diorite under microwave irradiation

Effects of pre-existing fissures on surface macro-crack characteristics of granite subjected to elevated temperatures

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