Experimental study of the effect of thermal damage on resistivity and mechanical properties of sandstone

Zhang, Weiqiang

doi:10.13168/agg.2015.0056

Cited by 6 publications

(3 citation statements)

References 13 publications

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“…Du et al [48] applied linear and exponential functions to describe the effect of porosity on the compressive strength and elastic modulus of hardened cement composites at an age of 28 days, respectively. Zhang et al [50,51] built the relationships between the electrical resistivity and uniaxial compressive strength of two kinds of Linyi (China) sandstones after thermal damage. Sun et al [52] obtained the linear connection of tensile strength with the P-wave velocity and thermal conductivity of sandstone under the combined effects of salt, cyclic wetting and drying cycles.…”

Section: Discussionmentioning

confidence: 99%

Experimental Study on Mechanical Properties of Nano-Alumina-Modified Cement Composites Exposed to High Temperatures

Wang,

Jiang,

Liu

et al. 2023

Processes

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Due to improved mechanical properties, nano-alumina (NA) addition has been considered as an interesting method to promote the performance of cement composites. To investigate the enhancing effect of NA on the fire resistance of cement-based composites, the physical and mechanical properties of NA-modified cement composites (NAMCCs) were experimentally measured after exposure to high temperatures (up to 800 °C). The variation mechanism of the physical properties of NAMCCs with increasing temperature was explored using X-ray diffraction (XRD) and scanning electron microscopy (SEM) methods. Increasing temperature leads to a gradual decrease in density and ultrasonic wave velocity but an overall increase in mass loss. The addition of NA particles effectively improved the mechanical properties of hardened cement pastes after heat treatment at all the temperatures studied. The compressive strength, elastic modulus and flexural strength all gradually decrease with increasing temperature. Combined with the changes in XRD and SEM, three regions are identified for the variation in mechanical performance in the temperature range of 20~400 °C, 400~600 °C and 600~800 °C. Finally, the relation between the physical and mechanical parameters of these regions was evaluated.

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Section: Discussionmentioning

confidence: 99%

Experimental Study on Mechanical Properties of Nano-Alumina-Modified Cement Composites Exposed to High Temperatures

Wang,

Jiang,

Liu

et al. 2023

Processes

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“…As sandstones are one of the most common rock formations (Yin et al, 2021), it is essential to study the changes in resistivity to investigate the geological structure and solve related geological problems. Previous studies have focused on the influence of fractures (Park et al, 2017), pressure (Amalokwu and Falcon-Suarez, 2021;Zheng et al, 2023), temperature (Zhang et al, 2016;Liu et al, 2020;Yuan et al, 2022), and rock type (Wu et al, 2023) on rock resistivity. However, research on the resistivity of sandstone is not extensive enough.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the influence of saturation on the resistivity response of sandstone

He,

Zheng,

et al. 2024

Front. Earth Sci.

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Studying the changes in electrical resistivity of sandstones under various frequencies and saturation levels is important for addressing many geological problems through electrical prospecting. In this study, we investigated the effect of different frequencies (500 Hz–200 kHz) and saturation levels (0%–100%) on the resistivity of sandstone in the Ordos region. Our research indicates that when the saturation level is low (<40%), the resistivity of the sandstone decreases rapidly. With the increase of saturation level, pore water gradually becomes another major factor affecting resistivity in addition to induced polarization effect. When the saturation level is high (>80%), the resistivity tends to stabilize. Additionally, the resistivity of sandstone decreases with the increase of saturation. Furthermore, with an increase in frequency, the rate of reduction in resistivity gradually slows down, and the resistivity of sandstone decreases under the influence of saturation. This study provides a valuable reference for the practical application of sandstone resistivity in geological prospecting.

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“…The variations of the bulk stone were carried out by mercury porosimetry. This technique gives information about the pore access distribution, which allows one to compare the size and frequency of the rock pore access ratio before and after heating [20,[30][31][32].…”

Section: Introductionmentioning

confidence: 99%

The Use of Infrared Thermography on the Measurement of Microstructural Changes of Reservoir Rocks Induced by Temperature

et al. 2021

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A variation of temperature produces a change in the microstructure of the rock due to the mineral thermal expansion and its residual strain. Depending on the temperature cycle and texture, microstresses may lead to the development of preexistent cracks or the creation of a new and irreversible cracking. The effect of temperature on reservoir rocks is an important topic since it conditions the permeability and the fluid flow. Two main questions arise from this: the first is if an irreversible cracking threshold is attained in the reservoir rocks at low temperature geothermal systems (around 100 °C); the second one is about the influence of thermal fatigue by the repetition of heating–cooling cycles on the different rock types. To answer these questions, four reservoir rocks (chalk, sandstone, fresh granite, and weathered granite) were submitted to two different thermal regimes. The first test was conceived to detect the irreversible cracking threshold, and for that, the rocks were submitted to progressive heating (90°, 100°, 110°, 120°, and 130 °C). The second test consisted of doing cycles of fast heating of the samples up to 200 °C. The microstructure variation was assessed by means of a scanning electron microscope, mercury porosimetry, and capillary water uptake combined with passive infrared thermography. Infrared thermography is an emerging tool in the field of rock study, used to detect water masses or determine thermal properties. The water transfer during the capillary tests of the rocks, before and after the tests, was monitored with this technique. In addition, the cooling rate index, a non-destructive parameter to detect cracking development, was calculated. The results made it possible to differentiate the behaviours in relation to the rock type, with a chalk and a weathered granite less susceptible to thermal stresses than a fresh granite and sandstone. In addition, infrared thermography resulted in being a very useful indirect technique to detect the changes on the surface, although they do not always correlate to the bulk microstructural changes.

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Experimental study of the effect of thermal damage on resistivity and mechanical properties of sandstone

Cited by 6 publications

References 13 publications

Experimental Study on Mechanical Properties of Nano-Alumina-Modified Cement Composites Exposed to High Temperatures

Experimental Study on Mechanical Properties of Nano-Alumina-Modified Cement Composites Exposed to High Temperatures

Experimental study of the influence of saturation on the resistivity response of sandstone

The Use of Infrared Thermography on the Measurement of Microstructural Changes of Reservoir Rocks Induced by Temperature

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