Investigation of the Gas Breakthrough Pressure of Cement Mortar with Different Experimental Techniques

Cheng, Zirui; Ye, Bin; Zhao, Jihui

doi:10.1007/s12205-021-0665-x

Cited by 3 publications

(1 citation statement)

References 27 publications

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“…The experimental study was carried out on mortar samples with different silica fume (SF) dosage as our previous study showed that SF can effectively reduce the gas permeability and refine the pore size distribution [18], which is helpful to verify the applicability of different prediction methods to samples with different pore structures. The samples were cast by using Chinese commercial P I 42.5 Portland cement, silica fume, ISO standard siliceous sand with a particle size of 0.08-2 mm, and tap water.…”

Section: Materials and Sample Preparationmentioning

confidence: 99%

Gas Permeability Prediction of Mortar Samples Based on Different Methods

et al. 2022

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Gas permeability is one of the durability indicators of cementitious materials; permeability predictions based on pore characteristics are useful approaches to obtain gas permeability when experimental conditions are limited. In this study, the gas permeabilities of mortar are predicted by using the Hagen–Poiseuille equation combined with a processed backscattered electron (BSE) image, the Katz–Thompson equation, and the Winland model with pore parameters obtained from MIP tests. The permeabilities calculated by the BSE method are different from the measured value because the observation range is limited and it is difficult to completely display the actual pore structure. The Katz–Thompson equation underestimates the contribution of coarse capillary pores on permeability, thus the results are two orders of magnitude lower than the measured value. The results obtained from the Winland model are close to the measured permeabilities, which indicate that the Winland model is the most suitable method for predicting gas permeability among the three methods described in this paper.

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Section: Materials and Sample Preparationmentioning

confidence: 99%

Gas Permeability Prediction of Mortar Samples Based on Different Methods

et al. 2022

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Evaluating gas breakthrough pressure and gas permeability in a landfill cover layer for mitigation of hazardous gas emissions

Wen

Cheng

et al. 2023

Journal of Environmental Management

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Numerical Study of Gas Breakthrough in Preferential Rocks for Underground Nuclear Waste Repositories

Zhang

Yin

et al. 2023

Minerals

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During the long-term storage of radioactive waste, the continuous generation of gas in the disposal area may influence the integrity of host rock. Thus, the investigation of gas migration and breakthrough in low-permeability rock is indispensable for the stability assessment. In this work, the pore space models of four potential host rocks (Boom clay, COx argillite, Opalinus clay, and Beishan granite) were generated via the binarization of the Gaussian random field. This method provides a randomly formed pore network that does rely on an initial definition of pore shape. The constructed models were analyzed and validated by using the mathematical morphology. A numerical calculation scenario of gas breakthrough on the basis of the Young–Laplace equation was proposed and applied. Results show that the gas breakthrough pressures are 2.62–4.11 MPa in Boom clay and 3.72–4.27 MPa in COx argillite. It enhances the idea that the capillary-induced gas breakthrough is possible at pressures lower than the fracture threshold. For Opalinus clay and Beishan granite, no connected pathway exists, and the breakthrough is more likely to occur through pathway dilation or fractures. The presented method has the advantage of experimental reproducibility and brings a new idea for the investigation of fluid migration in low-permeability rocks.

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Investigation of the Gas Breakthrough Pressure of Cement Mortar with Different Experimental Techniques

Cited by 3 publications

References 27 publications

Gas Permeability Prediction of Mortar Samples Based on Different Methods

Gas Permeability Prediction of Mortar Samples Based on Different Methods

Evaluating gas breakthrough pressure and gas permeability in a landfill cover layer for mitigation of hazardous gas emissions

Numerical Study of Gas Breakthrough in Preferential Rocks for Underground Nuclear Waste Repositories

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