Experimental study on seepage characteristics and stress sensitivity of desulfurization gypsum based concrete under triaxial stress

Xue, Weipei; Twenda, Chikama; Alam, Manawwar; Xu, Li; Wang, Zhongjian

doi:10.1016/j.jmrt.2023.04.241

Cited by 24 publications

(3 citation statements)

References 36 publications

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“…According to the NMR principle, the transverse relaxation time of hydrogen-containing fluids in saturated rock specimens is proportional to the pore size 22 – 24 . Therefore, the T 2 spectrum distribution can reflect the pore structure inside the rock.…”

Section: Experimental Results and Analysismentioning

confidence: 99%

Study on pore structure and the mechanical properties of sandstone-concrete binary under freeze–thaw environment

Hu,

Xue,

Shang

et al. 2023

Sci Rep

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In China's cold region water conservancy and hydropower projects, the contact interface between the dam and the reservoir bank rock is prone to cracking under external loading and freeze–thaw action, which may lead to dam-bank failure and damage and cause engineering disasters. The NMR (Nuclear Magnetic Resonance) tests and uniaxial compression tests of concrete, sandstone, and sandstone-concrete composite after different numbers of freeze–thaw cycles were carried out to analyze the pore structure development and uniaxial compression mechanical properties of the three types of specimens under different numbers of freeze–thaw cycles. The results show that freeze–thaw cycling promotes the development of pores in sandstone and concrete, and sandstone is more sensitive to low-temperature freeze–thaw than concrete. The UCS (uniaxial compressive strength) of the sandstone-concrete binary changed in a V-shaped with the increase of the dip angle of the cemented interface, and the angle had no obvious effect on the microscopic pores. The freeze–thaw effect on the deterioration of the microscopic pore structure and mechanical properties of the sandstone-concrete binary has a similar effect pattern, in which the deterioration rate of porosity and compressive strength is faster in the early freeze–thaw period, slower in the middle period, and increases in the later period compared with the middle period, but the increase is smaller than that in the early period of freeze–thaw. In addition, the relationship between the porosity and UCS of the sandstone-concrete binary under the freeze–thaw cycle environment is a quadratic parabola.

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Section: Experimental Results and Analysismentioning

confidence: 99%

Study on pore structure and the mechanical properties of sandstone-concrete binary under freeze–thaw environment

Hu,

Xue,

Shang

et al. 2023

Sci Rep

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“…The structure of the sample directly determines the compressive strength, as the strong foaming effect of disused ZSM-5 leads to a less compact structure in the AAC; therefore, a decrease in the compressive strength of the products was observed. Moreover, the compressive strength highly correlates with bulk density, and some studies have shown that a higher bulk density of the sample increases the compressive strength [30,43].…”

Section: Compressive Strength and Bulk Densitymentioning

confidence: 99%

The Influence of Disused ZSM-5 on the Performance of Phosphogypsum-Based Autoclaved Aerated Concrete

Zhou,

Wang,

Jiang

et al. 2023

Buildings

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Zeolite Socony Mobil-5 (ZSM-5) is a commonly spent catalyst in the petrochemical industry; and phosphogypsum (PG) is a kind of industrial waste produced in the process of phosphoric acid production. The environmental issues caused by these two solid wastes are urgent and thus sustainable methodologies are required to dispose of and reutilize them. In this research, the waste ZSM-5 and waste PG were used to prepare a novel autoclaved aerated concrete. The effects of the different contents of disused ZSM-5 on the microstructures and performance of the PG-based AAC were determined. The results showed that the compressive strength and bulk density of the DZ4 sample were 2.6 MPa and 520 kg/m3, respectively. This study provides a novel and green approach to the reutilization of both waste PG and spent ZSM-5.

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“…Scholars have traditionally relied on laboratory seepage test results to quantify the low-velocity non-Darcy seepage process of clay samples [12][13][14][15][16][17]. Currently, around ten characteristic curves have been established, with the power function curve being the most commonly used [18,19]. While the microscopic mechanism influencing the seepage state remains unclear, it has been suggested that the presence of bound water in clay-containing porous media affects the seepage state.…”

Section: Introductionmentioning

confidence: 99%

Effects of Clay Content on Non-Linear Seepage Behaviors in the Sand–Clay Porous Media Based on Low-Field Nuclear Magnetic Resonance

Yin,

Cui,

Zhang

et al. 2024

Water

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Clay is widely encountered in nature and directly influences seepage behaviors, exerting a crucial impact on engineering applications. Under low hydraulic gradients, seepage behaviors have been observed to deviate from Darcy’s law, displaying a non-linear trend. However, the impacts of clay content on non-linear seepage behavior and its pore-scale mechanisms to date remain unclear. In this study, constant-head seepage experiments were conducted in sand–clay porous media under various hydraulic gradients. Low-field nuclear magnetic resonance (LF-NMR) technology was utilized to monitor the bound-water and free-water contents of sand–clay porous media under different seepage states. The results show a threshold hydraulic gradient (i0) below which there is no flow, and a critical hydraulic gradient (icr) below which the relationship between the hydraulic gradient (i) and seepage velocity (v) is non-linear. Both hydraulic gradients increased with clay content. Moreover, the transformation between bound water and free water was observed during the seepage-state evolution (no flow to pre-Darcy or pre-Darcy to Darcy). As the hydraulic gradient reached the i0, the pore water pressure gradually overcame the adsorption force of the bound-water film, reducing the thickness of the bound-water film, and causing non-linear seepage behavior. When i0 < i < icr, the enlarging hydraulic gradient triggers the thinning of bound water and enhances the fluidity of pore water. Moreover, the increasing clay content augments the bound-water content required for the seepage state’s change.

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Experimental study on seepage characteristics and stress sensitivity of desulfurization gypsum based concrete under triaxial stress

Cited by 24 publications

References 36 publications

Study on pore structure and the mechanical properties of sandstone-concrete binary under freeze–thaw environment

Study on pore structure and the mechanical properties of sandstone-concrete binary under freeze–thaw environment

The Influence of Disused ZSM-5 on the Performance of Phosphogypsum-Based Autoclaved Aerated Concrete

Effects of Clay Content on Non-Linear Seepage Behaviors in the Sand–Clay Porous Media Based on Low-Field Nuclear Magnetic Resonance

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