Effect of Thermal Treatment on Brazilian Tensile Strength of Granites with Different Grain Size Distributions

Zhao, Zhihong; Liu, Zhina; Pu, Hai; Li, Xue

doi:10.1007/s00603-018-1404-6

Cited by 105 publications

(16 citation statements)

References 22 publications

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“…As an example, specimens have faster energy loss and cooling for a unit temperature change in water rather than air. Therefore, the specimens cooled in water had less-resistivity against a temperature change in comparison to those cooling in air (Zhao et al 2018;Brotons et al 2013).…”

Section: Discussionmentioning

confidence: 95%

Thermal Shock Effect on Strength Loss Properties of Rock Materials: An Experimental Study on Thermal Fatigue Durability

Komurlu

2019

Doğal Afetler Ve Çevre Dergisi

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Four different types of rock materials from Eastern Black Sea Region of Turkey were investigated to determine their change in porosity as well as the degree of cracking, fracturing, disintegration and strength loss under heating-cooling cycles with variations in temperatures up to 300 C o. Cooling time and thermal strains of the rock specimens were also determined in this study. Totally, sixty rock core samples were tested to evaluate their physico-mechanical and mechanical properties. Thermal cycling was found to lead for increase in the porosity of the rocks, making new cracks, particle disintegration for two types of tested rocks and considerable losses in uniaxial compressive strength values of all the rock materials tested in this study. The purpose of this study is to investigate immediate changes in temperature values rather than step by step heating up to a target temperature. For instance, rock samples were directly put in 250 o C stove from a-50 o C cabin in the last and fifth thermal cycling. After the heating process, specimens were cooled in water and air. This study aims to be a usable reference to establish a thermal change procedure and improve a new testing method for determination of thermal fatigue durability of rock materials.

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Section: Discussionmentioning

confidence: 95%

Thermal Shock Effect on Strength Loss Properties of Rock Materials: An Experimental Study on Thermal Fatigue Durability

Komurlu

2019

Doğal Afetler Ve Çevre Dergisi

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“…49 As the treatment temperature increased, the mass of the sandstone specimen decreased, which was consistent with a previous study. 30 The main reason for the reduction in mass was the loss of water that existed in different states (such as attached water, bound water and mineral bound water) and the desorption and decomposition of clay minerals. The density of the sandstone specimen increased at a change rate of 0.39% when the heat treatment temperature increased to 200 C. When the temperature increased from 200 to 1000 C, the volume of sandstone started to increase, and the change rate of volume increased with temperature.…”

Section: Mechanism Of High Temperature In Changing Mechanical Behavmentioning

confidence: 99%

“…25 To improve the understanding of mechanical properties of rock after thermal treatments, many relevant experiments have been performed previously. The strength and deformation parameters of thermally damaged rock specimens under uniaxial compression, [26][27][28][29] Brazilian splitting test, [30][31][32][33] three-point bedding test, 34,35 conventional triaxial compression, [36][37][38] fatigue loading, 39 triaxial unloading of confining pressure, 40 triaxial creep loading 41 and dynamic impact 42 have been investigated. These studies revealed that the mechanical properties of rocks evolved nonlinearly with the increase in temperature.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on fracture behaviour of three‐flawed sandstone specimens after high‐temperature treatments

Huang

Yang

Dong

2020

Fatigue Fract Eng Mat Struct

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The crack coalescence of rocks significantly affects the stability of rock engineering, and extensive studies have been performed on preflawed rock specimens without thermal treatment. However, the fracturing behaviour of preflawed specimens after thermal treatment has not been investigated comprehensively. In this study, three‐flawed sandstone specimens with different flaw inclinations after high‐temperature treatments were tested under uniaxial compression. Photographic, acoustic emission and digital image correlation techniques were used to investigate the crack initiation, propagation and coalescence behaviour. Experimental results show that the peak strength, elastic modulus and peak strain of the three‐flawed specimens were lower than those of intact specimens and that they gradually recovered with increasing flaw angle. The peak strength and elastic modulus first increased and then decreased, whereas the peak strain increased with temperature. Noncoalescence, indirect coalescence and direct coalescence were three patterns observed between the two adjacent pre‐existing flaws. Finally, the mechanism of high temperature in alteration of the mechanical properties of sandstone was revealed through microobservations.

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“…In addition, the effects of water cooling on the rocks with different particle sizes are quite different. Zhao et al [27] evaluated the tensile strength of rock with increasing grain size; as the grain size increases, the thermal cracks decrease, but the cracks become longer, which leads to a decrease in tensile strength. Wu et al [28] found that the physical and mechanical properties of granites with coarser particles are less sensitive to the rapid cooling.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation on Thermal Damage of Granite Subjected to Heating and Cooling

Yin

et al. 2021

Mathematics

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Rock mass is frequently subjected to rapid cooling in geothermal reservoir during water injection and reinjection. In this paper, to understand the effects of cooling treatments on heated granite, heat conduction tests, magnetic resonance imaging tests and numerical investigations were carried out to evaluate variations of thermal damage. The test results reveal that the heat flux and the heat transfer coefficient increases to a maximum within a few seconds and then gradually decreases. The maximum heat transfer coefficient of the samples treated with the initial temperature of 500, 400, 300, 200 and 100 °C is 2.3, 2.15, 1.9, 1.22 and 1.86 W·m−2K−1, respectively. The edge area with drastic temperature changes is accompanied by the densely distributed microcracks; in contrast, the internal cracks of the specimen with gentle temperature are relatively sparse. The thermal damage contributed by the heating cracks occurs at a continuous decrease, and the thermal damage contributed by cooling occurs at a continuous increase, with the increasing heating temperature. The damage caused by heating is the result of the uneven thermal expansion of the local particles, the propagation of cooling cracks is strongly affected by heating cracks, and stress concentration induced by thermal shock promotes the coalescence of the pre-existing heating cracks.

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Effect of Thermal Treatment on Brazilian Tensile Strength of Granites with Different Grain Size Distributions

Cited by 105 publications

References 22 publications

Thermal Shock Effect on Strength Loss Properties of Rock Materials: An Experimental Study on Thermal Fatigue Durability

Thermal Shock Effect on Strength Loss Properties of Rock Materials: An Experimental Study on Thermal Fatigue Durability

Experimental study on fracture behaviour of three‐flawed sandstone specimens after high‐temperature treatments

Experimental and Numerical Investigation on Thermal Damage of Granite Subjected to Heating and Cooling

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