Ultrasonic time-frequency method to evaluate the deterioration properties of rock suffered from freeze-thaw weathering

Wang, Peng; Xu, Jinyu; Fang, Xikui; Wang, Peixi; Zheng, Guanghui; Wen, Ming

doi:10.1016/j.coldregions.2017.07.002

Cited by 37 publications

(18 citation statements)

References 24 publications

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“…In freeze-thaw tests with limestones, growth of cracks at the interface between allochems and sparry cement and the detachment of peloids and ooids has been observed [27]. The cement between grains in sandstone was found to be affected by this kind of test [29] and also by wetting-drying cycles [60].…”

Section: Textural and Structural Featuresmentioning

confidence: 93%

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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Section: Textural and Structural Featuresmentioning

confidence: 93%

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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“…), mechanical properties (compressive strength, elastic modulus, internal friction angle, etc. ), and microstructure characteristics of rocks were all significantly influenced by the number of freeze-thaw cycles [8][9][10][11][12][13], which have been widely discussed by many scholars. Fu et al studied the influence of the number of freeze-thaw cycles on the mechanical properties of slate under pure uniaxial compression, and the results indicated that the elastic modulus, shear modulus, and uniaxial compressive strength of slate all took on an exponential downward trend with the increasing freeze-thaw cycles.…”

Section: Introductionmentioning

confidence: 99%

“…Yang et al [11] conducted research on the creep characteristics of quartz sandstone under pure uniaxial compression with different numbers of freeze-thaw cycles and chemical corrosion conditions; they observed the microstructure of the tested specimen by SEM, revealing the influence of the number of freeze-thaw cycles on the creep rupture of quartz sandstone. Uniaxial compression, splitting tension, and angle-changed shear tests on red sandstone with different freeze-thaw cycles (F-T cycles) were carried out by Wang et al [12] with ultrasonic detections. Liu et al [13] conducted the triaxial tests and the freeze-thaw tests on Qinghai-Tibet silty sand to investigate the failure strength and the strength parameters (elastic modulus, cohesion, and angle of internal friction).…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Physical-mechanical Properties and Fracture Behaviors of Saturated Yellow Sandstone Considering Coupling Effect of Freeze-Thaw and Specimen Inclination

Chen

et al. 2020

Sustainability

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The effect of freeze-thaw on the physical-mechanical properties and fracture behavior of rock under combined compression and shear loading was crucial for revealing the instability mechanism and optimizing the structure design of rock engineering in cold regions. However, there were few reports on the failure behavior of rock treated by freeze-thaw under combined compression and shear loading due to the lack of test equipment. In this work, a novel combined compression and shear test (C-CAST) system was introduced to carry out a series of uniaxial compression tests on saturated yellow sandstone under various inclination angles (θ = 0°, 5°, 10°, and 15°) and the number of freeze-thaw cycles (N = 0, 20, 40, and 60). The test results showed that the P-wave velocity dramatically decreased, while the rock quality and porosity increased gradually as N increased; the peak compression strength and elastic modulus obviously decreased with the increasing θ and N, while the peak shear stress increased gradually with the increasing θ and decreased with the increase of N, indicating that the shear stress component can accelerate the crack propagation and reduce its resistance to deformation. The acoustic emission (AE) results revealed that the change of crack initiation (CI) stress and crack damage (CD) stress with the θ and N had a similar trend as that of the peak compression strength and elastic modulus. Particularly, the CI and CD thresholds at 60 cycles were only 81.31% and 84.47% of that at 0° cycle and indicated a serious freeze-thaw damage phenomenon, which was consistent with the results of scanning electron microscopy (SEM) with the appearance of some large-size damage cracks. The fracture mode of sandstone was dependent on the inclination angle. The failure mode developed from both the tensile mode (0°) and combined tensile-shear mode (5°) to a pure shear failure (10°–15°) with the increasing inclination angle. Meanwhile, the freeze-thaw cycle only had an obvious effect on the failure mode of the specimen at a 5° inclination. Finally, a novel multivariate regression analysis method was used to predict the peak compression strength and elastic modulus based on the initial strength parameters (θ = 0°, N = 0). The study results can provide an important reference for the engineering design of rock subjected to a complex stress environment in cold regions.

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“…In the water-enriched cold environment, this initial defect is easily affected by the loss effect induced by freeze-thaw cycles and loads, causing changes in the mechanical properties and failure laws of rocks. The damage change, the mechanical behavior and deformation characteristics of the rock under different freezethaw cycles have certain differences [1][2][3][4]. The research about constitutive model can accurately reflect the stressstrain relationship of the rock under the effect of freezethaw cycles, which can provide a theoretical reference for the analysis and prediction of the rock material strength, deformation and failure characteristics under the freezing and thawing environment.…”

Section: Introductionmentioning

confidence: 99%

Uniaxial Compression Fractal Damage Constitutive Model of Rock Subjected to Freezing and Thawing

Zhou¹,

Jiang²,

Luo³

et al. 2020

Period. Polytech. Civil Eng.

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Mechanical properties of the rock in the cold regions are often affected by freeze-thaw cycles and loads. It is of great theoretical significance and engineering value to establish a uniaxial compression damage constitutive model of the rock under freeze-thaw cycles that can reflect the relationship between macroscopic and mesoscopic structural damage. In this paper, macroscopic and mesoscopic methods are combined with statistical methods to quantitatively analyze the damage degree of rock under freeze-thaw cycles and loads. Combined with the fractal features of the macroscopic image of the section, a fractal damage constitutive model considering the residual strength of rock is established. In addition, the model is subsequently verified by the experiment. The experiment shows that the mechanical properties of rocks subjected to freeze-thaw cycles and loads are determined by freeze-thaw damage variables, load damage variables, and their coupling effects. As the number of freeze-thaw cycles increases, the uniaxial compressive strength and elastic modulus of rocks decrease, and peak strain increases. By using the fractal dimension of the compression fracture surface as a bridge considering the residual strength of the rock, the constitutive model can better reflect the compaction stage, elastic deformation stage and plastic deformation stage of the uniaxial compression process of the freeze-thaw rocks.

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Ultrasonic time-frequency method to evaluate the deterioration properties of rock suffered from freeze-thaw weathering

Cited by 37 publications

References 24 publications

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

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

Experimental Study on Physical-mechanical Properties and Fracture Behaviors of Saturated Yellow Sandstone Considering Coupling Effect of Freeze-Thaw and Specimen Inclination

Uniaxial Compression Fractal Damage Constitutive Model of Rock Subjected to Freezing and Thawing

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