Effect of Temperature on Macroscopic and Microscopic Properties of Sandstone From Qidong Coal Mine

Deng, Long-Chuan; Li, Xiaozhao; Wang, Yingchao; Wu, Yun; Huang, Zhen; Jiang, Chunlu

doi:10.1007/s00603-021-02679-6

Cited by 20 publications

(3 citation statements)

References 45 publications

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“…By subjecting it to varying temperatures, Zhang et al [24] observed that temperature indeed influences the mechanical properties of asphalt concrete. Chen et al [25] scrutinized asphalt with different oil/stone ratios at varying temperatures and concluded that temperature affects the stress and strain of asphalt concrete specimens. When the temperature plummeted to 0 • C and below, the asphalt concrete exhibited brittle damage and stress-softening behavior.…”

Section: Introductionmentioning

confidence: 99%

Study on the Effect of Asphalt Static Conditions on the Tensile Properties of Acidic Aggregate Hydraulic Asphalt Concrete

Bao,

He,

Wang

et al. 2024

Materials

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Hydraulic asphalt concrete is known for its excellent seepage control performance and strong deformation resistance. This engineering material has widespread applications in the seepage control structures of hydraulic buildings. Recent projects have investigated the use of acidic aggregates to improve economic efficiency. However, they have also highlighted the weaker adhesion between acidic aggregates and asphalt, which necessitates stringent construction process control. This study investigates the impact of resting conditions on the tensile properties of acidic aggregate hydraulic asphalt concrete. The results of the tensile testing indicate that the storage time significantly affects the performance of asphalt concrete. The tensile strength of the specimens without anti-stripping agents decreased from 1.711 MPa to 0.914 MPa after resting periods of 0, 10, 20, and 30 days. The specimens treated with anti-stripping agents also showed a decrease in tensile strength over time, similar to the trend observed in the previous specimens. Digital specimen simulations indicated a decrease in cohesion between the asphalt and the aggregate from 5.375 MPa to 2.664 MPa after 30 days, representing a reduction of 50.44%. To counteract the effect of the storage time on the bonding between acidic aggregates and asphalt, this study recommends reducing the grading index and maximum size of aggregates, decreasing the coarse aggregate content, and selecting smooth aggregate shapes.

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Section: Introductionmentioning

confidence: 99%

Study on the Effect of Asphalt Static Conditions on the Tensile Properties of Acidic Aggregate Hydraulic Asphalt Concrete

Bao,

He,

Wang

et al. 2024

Materials

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“…However, there is relatively little research on the size effect of RCHAC under dynamic loads. Chen [19] and Albayati [20] reported that HAC has elastic-brittle mechanics and characteristics in low-temperature environments. Therefore, for the dynamic size effect of RCHAC in alpine cold regions, previous studies on the size effect of concrete-like materials carried out by other researchers can be used as references.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Size Effect on Roller-Compacted Hydraulic Asphalt Concrete under Different Strain Rates of Loading

Meng,

Liu,

Ning

et al. 2024

Materials

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Asphalt concrete is widely used in hydraulic structure facilities as an impermeable structure in alpine cold regions, and its dynamic mechanical properties are influenced by the strain rate and specimen size. However, the specimen size has an important effect on mechanical properties; few systematic studies have investigated on the size effect of hydraulic asphalt concrete (HAC) under dynamic or static loading rates. In the present study, four sizes of cylindrical roller-compacted hydraulic asphalt concrete (RCHAC) specimens with heights of 50 mm, 100 mm, 150 mm, and 200 mm were prepared and tested under different loading rates ranging from 10−5 s−1 to 10−2 s−1 to investigate the size effects of mechanical properties and failure modes at the temperature of 5 °C. The effect of strain rate on the size effects of the compressive strength and the elastic modulus of RCHAC have also been explored. These tests indicate that when the specimen size increases, the compressive strength and failure degree decrease, while the elastic modulus increases. When the height increases from 50 mm to 200 mm, the compressive strength at different strain rates decreased by more than 50%. Furthermore, the elastic modulus increased by about 211.8% from 0.51 GPa to 1.59 GPa at a strain rate of 10−5 s−1, and increased by 150% from 5.08 GPa to 12.71 GPa at a strain rate of 10−2 s−1. As the strain rate increases, the variation trends with the size of the compressive strength, elastic modulus, and failure degree are distinctly intensified. A modified dynamic size effect law, which incorporates both the specimen size and strain rate, is proposed and verified to illustrate the dynamic size effect for the RCHAC under different loading rates.

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“…After subjecting to high temperature, thermal cracks are likely to occur inside and outside the rock, which can change the physical and mechanical properties of the rock and lead to some potential disasters in hot dry rock development, geological storage of high radioactive nuclear waste and underground coal gasification [1][2][3][4][5]. On the other hand, some deep underground projects such as the development of oil, gas, and geothermal resources also require fracturing to create a certain volume of complex fracture networks to increase the seepage of oil, gas, or heating media [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Study on Thermal Crack Characteristics of Granite in Shandong Province, China under Different Temperatures and Heating/Cooling Treatments

Zhang,

Li,

Zhang

et al. 2023

Preprint

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Understanding the thermal cracks of rock caused by high temperature is of great help to the development of underground engineering, such as geothermal mining, underground coal gasification. Although there has been many study on thermal cracking, it is not systematic and in-depth enough. In order to deeply study the thermal crack mechanism of rock, this paper conducted thermal cracking experiments on granite at different temperatures and heating/cooling paths, and qualitative and quantitative analysis was conducted on the crack initiation characteristics, propagation paths, and crack network morphology of rock thermal crack under different test conditions. The thermal crack mechanism was also analyzed from the perspectives of mineral petrology, fracture mechanics, thermodynamics, and other aspects. The research results show that there are two obvious mutation points in the study temperature range for samples with fast cooling paths (SF path: slow heating and fast cooling; FF path: fast heating and fast cooling), around 200-300 ℃ and 600 ℃, respectively, while for samples with slow cooling paths (SS path: slow heating and slow cooling; FS path: fast heating and slow cooling), there is only one mutation point around 600 ℃. The initiation positions of thermal cracking under all temperature paths are relatively similar, with intergranular crack located between particles at the edge of the sample or intercrystalline crack in the middle of feldspar or quartz aggregates. The initiation temperature of SF and FF path specimens is relatively low compared to SS and FS path specimens, and the number and size of cracks is small. The crack network structure formed by the SF path is the most complex, with the largest crack ratio and cumulative crack length; The crack network structure formed by the FF path is relatively complex, with a larger main crack size but relatively fewer secondary cracks; The FS and SS paths do not form a complex network with good connectivity. The process of thermal crack development can be divided into three stages: the development of small cracks, the joint development of main cracks and small cracks, and the connection of cracks into a network structure. The mechanism of thermal crack propagation is that the expansion and thermal conductivity between different crystals are different. The thermal stress caused by temperature gradient and the tension or shear stress caused by the inconsistent deformation of crystals form stress concentration in weak areas such as particles boundary, cleavage, and original cracks. Firstly, it causes some crystals with smaller strength or less rounded shape to crack, and when the combined stress is large, the cracks will gradually expand along the existing fine cracks. This also explains that the most main cracks of the SF and FF path specimens mainly surround some large mineral aggregates or between particles.

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Effect of Temperature on Macroscopic and Microscopic Properties of Sandstone From Qidong Coal Mine

Cited by 20 publications

References 45 publications

Study on the Effect of Asphalt Static Conditions on the Tensile Properties of Acidic Aggregate Hydraulic Asphalt Concrete

Study on the Effect of Asphalt Static Conditions on the Tensile Properties of Acidic Aggregate Hydraulic Asphalt Concrete

Experimental Investigation of the Size Effect on Roller-Compacted Hydraulic Asphalt Concrete under Different Strain Rates of Loading

Study on Thermal Crack Characteristics of Granite in Shandong Province, China under Different Temperatures and Heating/Cooling Treatments

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