Damage mechanism of sandstones subject to cyclic freeze–thaw (FT) actions based on high-resolution computed tomography (CT)

Li, Bo; Zhang, Guanghua; Ma, Wei; Liu, Minghao; Li, Anyuan

doi:10.1007/s10064-022-02872-z

Cited by 12 publications

(13 citation statements)

References 34 publications

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“…Each sample group was divided into 1200 cross-sections for a 45-minute scan to assure 3D reconstruction accuracy. VG Studio Max, one of the most advanced CT image post-processing software platforms, was used to precisely measure, analyze, and calculate 3D volume data sets from the 1200 images captured by the scanner [25]. For the analysis of the evolution of the 3D spatial structure, we only selected the middle portion of the specimen (20 mm in diameter, 60 mm in height) to reduce the influence of the specimen boundary on the results (Figure 3).…”

Section: Methodsmentioning

confidence: 99%

“…However, rocks can have pores of a wide variety of sizes and shapes, which leads to a wide range of possible variations, which in turn results in pores that are exceedingly complicated and irregular in structure. As a result, it is challenging to perform quantitative research on rocks in order to investigate their internal pore structure [25]. Due to their non-destructive nature and ability to reconstruct the 3D spatial structure of objects, X-ray computed microtomography or micro-CT have been widely used for observing and quantifying the change in the internal structure of materials under different conditions in recent years [26].…”

Section: Introductionmentioning

confidence: 99%

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Study on the Characteristics of Pore Change in Tuff under the Frost and Salt Action Using High-Precision CT Scanning Equipment

Chen,

Sun,

Wang

et al. 2023

Applied Sciences

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Using high-precision CT scanning equipment, two series of tests on frost and salt weathering were conducted to investigate the characteristics of pore change in tuff. Experiments on frost and salt aging were performed with pieces of tuff from the same area of southeast China. One set of tuff samples was soaked in saturated sodium sulfate or magnesium sulfate solutions for 60 days. Another set of tuff samples were subjected to 60 freeze–thaw cycles after being submerged in saturated sodium sulfate or magnesium sulfate solutions for 48 h. Our study demonstrates that processes such as salt erosion and freeze–thaw affect the pore evolution of tuffs significantly. Tuff lost 1.56% of its mass after being submerged in magnesium sulfate solutions for 60 days, while tuff submerged in sodium sulfate solutions gained a negative 0.33% of its mass. After 60 freeze–thaw cycles, the mass loss of tuff samples immersed in sodium sulfate, magnesium sulfate, and distilled water solutions was 3.52%, 3.58%, and 3.82%, respectively. The average porosity of the magnesium sulfate and sodium sulfate test groups increased by 6.59% and 4.14%, respectively, when the number of days of salt erosion was extended from 10 to 60 days. The average porosity of tuff samples immersed in magnesium persulfate and sodium sulfate solutions increased by 2.25% and 2.18%, respectively, as the number of freeze–thaw cycles went from 10 to 60.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on the Characteristics of Pore Change in Tuff under the Frost and Salt Action Using High-Precision CT Scanning Equipment

Chen,

Sun,

Wang

et al. 2023

Applied Sciences

Self Cite

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“…Figure 11 shows the reconstruction of 3D entities (Figure 11A1-E1) and 3D micro-flaws (Figure 11A2-E2) for thermally damaged basalt specimens. In Figures 10 and 11, two colors of blue and red represent the small and large volumes of micro-flaws, 45,46 respectively.…”

Section: Damage Mechanism Of Thermal Fatigue For Basaltmentioning

confidence: 99%

Experimental study on thermal fatigue damage and failure mechanisms of basalt exposed to high‐temperature treatments

Niu

Wang

et al. 2023

Fatigue Fract Eng Mat Struct

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Understanding the effects of thermal fatigue damage on the failure mechanisms of rocks is a key concern in underground engineering. The effects of high temperature on the physical-mechanical behaviors and the failure mechanism of basalt under uniaxial compression are investigated with a combination of acoustic emission (AE), computed tomography (CT), and scanning electron microscope (SEM). The high temperature heavily affects the physicalmechanical properties of basalt but has no effect on the mineral compositions. The evolution characteristics of inter-event time function F(τ) and cumulative AE energy can be employed to characterize the fracture process of thermally damaged basalt. The damage mechanisms of thermal fatigue are attributed to the occurrence of intergranular cracks, intragranular cracks, and transgranular cracks and irregular holes within basalt. The failure mechanisms of basalt change from shear fracture to mixed tensile-shear fracture and finally to tensile fracture based on the statistical characteristics of low and high dominant frequencies. K E Y W O R D S acoustic emission, dominant frequency, failure mechanism, high-temperature treatment, thermal fatigue damage, uniaxial compression Highlights • The thermal fatigue effects on the physical-mechanical behaviors of basalt are studied. • The relationship between failure process and AE characteristics is constructed. • The damage mechanisms of thermal fatigue for basalt are revealed. • The failure mechanisms of basalt under uniaxial compression are revealed.

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“…Rocks whose surface is easily softened by water, such as argillaceous siltstone and dolomitic limestone under acidic conditions, show the particle loss mode. In terms of micro view, researchers have conducted experimental exploration on the relationship between rock freezing-thawing damage and porosity by means of scanning electron microscopy, CT scanning and nuclear magnetic resonance (Li et al, 2022;Zhang et al, 2022;Liu et al, 2023;Jiang et al, 2019;Mousavi et al, 2020;Wang et al, 2020). The results show that the more freeze-thaw cycles, the greater the porosity and damage degree of rock samples.…”

Section: Introductionmentioning

confidence: 99%

Static pressure and dynamic impact characteristics of filled jointed rock after frozen-thaw cycle damage

Chai

Liu

et al. 2023

Front. Ecol. Evol.

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In the construction project, rock mass is often destroyed from the joint plane, and the jointed rock mass is easy to be eroded by freeze-thaw environment. Therefore, the damage mechanical properties of filled jointed rock mass under freeze-thaw action are very important for construction disaster prevention, engineering safety evaluation and reinforcement. In order to research the effect of the freeze-thaw cycle on the mechanical deterioration properties and damage characteristics of filled jointed rocks, prefabricated filled jointed rock samples are tested with different numbers of freeze-thaw cycles under the temperature range of -20°C~20°C. Then the wave velocity test, static compression test and SHPB impact test are conducted on the rock samples after freeze-thaw. Based on the test results, the change regularity of wave velocity degradation, static compression mechanical properties and dynamic compression mechanical properties of filled jointed rocks under the effect of freeze-thaw cycles were analyzed. The results show that the wave velocity, static compressive strength and dynamic compressive strength of the filled jointed rocks all show a downtrend with the increase of the number of freeze-thaw cycles, and each parameter is positively correlated with the strength of the filling materials. Among them, the decrease in the wave velocity of the rock sample after 30 freeze-thaw cycles is greater than 30%, and the strength loss of the static peak compressive strength exceeds half of its initial strength. The static peak strain rises exponentially with the increase of the number of freeze-thaw cycles while the dynamic peak strain does not show a clear trend. The dynamic peak strain is about 1/10 to 1/5 of the static peak strain. Under the same freeze-thaw action, the lower the strength of filling material, the more serious the damage.

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Damage mechanism of sandstones subject to cyclic freeze–thaw (FT) actions based on high-resolution computed tomography (CT)

Cited by 12 publications

References 34 publications

Study on the Characteristics of Pore Change in Tuff under the Frost and Salt Action Using High-Precision CT Scanning Equipment

Study on the Characteristics of Pore Change in Tuff under the Frost and Salt Action Using High-Precision CT Scanning Equipment

Experimental study on thermal fatigue damage and failure mechanisms of basalt exposed to high‐temperature treatments

Static pressure and dynamic impact characteristics of filled jointed rock after frozen-thaw cycle damage

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