Effects of multiple heating-cooling cycles on the permeability and microstructure of a mortar

Ye, Bin; Cheng, Zirui; Ni, Xueqian

doi:10.1016/j.conbuildmat.2018.05.009

Cited by 23 publications

(10 citation statements)

References 29 publications

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“…This finding is consistent with the above test results. Ye et al [42] have also confirmed this finding. The permeability decreases significantly as the confining pressure increases because the internal pore structure and penetrating fractures are compressed under the confining pressure, reducing the free path for the gas and thus reducing the gas flow [46].…”

Section: Gas Permeability At Different Confining Pressuresmentioning

confidence: 60%

“…1. Ye et al [42] studied the effects of multiple heating-cooling cycles on the permeability and microstructure of a mortar. The study showed that after five heating-cooling cycles, the permeability increased by 40% compared with the initial permeability, which was considered to be caused by the generation of microcracks during the heating-cooling cycles.…”

Section: Mass Lossmentioning

confidence: 99%

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Effect of Dry-Wet Cycles on the Transport and Mechanical Properties of Cement Mortar Subjected to Sulfate Attack

Chen¹,

Shan²,

Liang³

et al. 2023

Fluid Dynamics &Amp; Materials Processing

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This study deals with the analysis of the detrimental effects of a "sulfate attack" on cement mortar for different dry-wet cycles. The mass loss, tensile strength, and gas permeability coefficient were determined and analyzed under different exposure conditions. At the same time, nitrogen adsorption (NAD), scanning electron microscopy (SEM), and X-ray diffraction (XRD) techniques were used to analyze the corresponding variations in the microstructure and the corrosion products. The results show that certain properties of the cement mortar evolve differently according to the durations of the dry-wet cycles and that some damage is caused to the mortars in aqueous solution. The pores fill with corrosion products, increasing the mortar specimen mass and tensile strength while reducing the permeability coefficient and pore size distribution. As corrosion proceeds, the crystallization pressure of the corrosion products increases, resulting in a 16% reduction in tensile strength from the initial value and a 2.6-factor increase in the permeability coefficient, indicating sensitivity to sulfate attack damage. Furthermore, the main corrosion products generated in the experiment are gypsum and ettringite. Application of osmotic pressure and extension of the immersion time can accelerate the erosion process.

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Section: Gas Permeability At Different Confining Pressuresmentioning

confidence: 60%

Section: Mass Lossmentioning

confidence: 99%

Effect of Dry-Wet Cycles on the Transport and Mechanical Properties of Cement Mortar Subjected to Sulfate Attack

Chen¹,

Shan²,

Liang³

et al. 2023

Fluid Dynamics &Amp; Materials Processing

View full text Add to dashboard Cite

show abstract

“…It is found that gas permeability decreases during the heating process and increases during the cooling process. The pore volume and gas permeability indicates that microcracks are generated when the temperature exceeds 60 °C [ 18 ]. However, most of these studies related to the effects of high temperature, which does not correspond to the different heating rates.…”

Section: Introductionmentioning

confidence: 99%

Heating Rate Effect on Gas Permeability and Pore Structure of Mortar under High Temperature

et al. 2022

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This experimental study investigated the effect of heating rate on mortar gas permeability and microstructure. The mortar was heated to three target temperatures (400 °C, 500 °C, and 600 °C) at three heating rates (5 °C/min,10 °C/min, and 15 °C/min). The variations of gas permeability and porosity were measured simultaneously at different confining pressures, and the changes in mortar microstructure were analyzed by NMR and SEM techniques. The results show that the porosity and gas permeability increase with an increase in temperature and heating rate. The gas permeability and porosity continue to decrease as confinement is increased due to a reduction in the pore volume. The microstructure observed by SEM indicates that the high heating rate induces some microcracks at 500 °C and 600 °C. The fractal dimension based on NMR can quantitatively characterize the complexity of the mortar pore structure and shows a quadratic decreasing relationship with gas permeability and porosity.

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“…The pumped hydroelectric storage (PHS) (Winde et al, 2017;Jurasz et al, 2018;Sultan et al, 2018;Liu et al, 2020c;Emmanouil et al, 2021) and compressed air energy storage (CAES) (Zhao et al, 2015;Soltani et al, 2020;Liu et al, 2021;Yang et al, 2022) have been regarded as promising large-scale electric energy storage technologies. The PHS is limited by the hydrogeological conditions and large cover depths during its construction, whereas CAES has attracted much attention because of its lower capital and maintenance cost (Rutqvist et al, 2012;Venkataramania et al, 2016;Wei et al, 2016;Chen et al, 2017;Ye et al, 2018;Liu et al, 2020d).…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Mechanical and Permeability Properties of Lining Concrete Under Different Complex Stress Paths

et al. 2022

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A promising large-scale energy storage is underground compressed air energy storage (CAES) in lined rock caverns. To ensure the safety and stability of storage caverns because of the influence of periodic injection during production, it is crucial to understand the mechanical behavior of lining concrete under different complex stress paths. In this study, three types of uniaxial compressive fatigue test and uniaxial creep test were conducted on concrete. The following conclusions were obtained from the results. 1) The irreversible deformation after the interval was larger than that before the interval in the discontinuous multi-step cyclic loading (DMCL) test. 2) Loading velocity significantly influenced concrete fatigue, and the irreversible deformation in the cycle of low loading velocity was greater than that in the cycle of high loading velocity. 3) The residual strain increased with an increase in stress level. 4) The creep strain increased with an increase in stress level during the multi-step creep loading test; the fractional derivative results were more consistent with the experimental results. 5) The permeability of concrete increased rapidly under the influence of an external force when the stress level exceeded 0.73.

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Effects of multiple heating-cooling cycles on the permeability and microstructure of a mortar

Cited by 23 publications

References 29 publications

Effect of Dry-Wet Cycles on the Transport and Mechanical Properties of Cement Mortar Subjected to Sulfate Attack

Effect of Dry-Wet Cycles on the Transport and Mechanical Properties of Cement Mortar Subjected to Sulfate Attack

Heating Rate Effect on Gas Permeability and Pore Structure of Mortar under High Temperature

Experimental Study on the Mechanical and Permeability Properties of Lining Concrete Under Different Complex Stress Paths

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