Investigation on parameters optimization for gas permeability testing of concrete: Inlet-gas pressure and confining pressure

Qian, Rusheng; Shi, Jiashun; Li, Yan; Chen, Wei; Liu, Guojian; Li, Yong; She, Wei; Zhang, Yunsheng

doi:10.1016/j.conbuildmat.2020.118901

Cited by 27 publications

(3 citation statements)

References 37 publications

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“…Afterward, cellular automaton-like evolution rules with predefined dissolution and reaction probabilities were employed to manipulate the movement and phase transition of basic voxels accounting for the reactions in the system, which simulates the cement hydration process and leads to microstructural development. More details about the modeling procedure can be found in a previous publication (Liu et al 2020). For the attributes of the binder used in the simulation, Portland cement (Type I) with a Blaine fineness of 369 m 2 /kg consists of 53.72% C 3 S, 24.09% C 2 S, 7.61% C 3 A, 8.98% C 4 AF and 5.60% CaSO 4 •2H 2 O.…”

Section: Hydration Model For Cementitious Materialsmentioning

confidence: 99%

“…Because of the minimum pore size of the representative unit in the model, the minimum pixel size of the hydration structure in this paper is 1 μm (i.e., all the pores that can be simulated are greater than 1 μm). In general, the pores of cementitious materials with a w/c ratio of 0.5 are mostly distributed between 0.05 μm and 0.10 μm, and pores less than 1 μm are regarded as solid phases (impermeable) in the model, which underestimates the diffusivity coefficient (Qian et al 2018(Qian et al , 2020.…”

Section: Model Verificationmentioning

confidence: 99%

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Modelling of Damage Spatiotemporal Distribution in Saturated Cementitious Materials and its Chloride Transport Evolution

Rusheng

Gao

et al. 2023

ACT

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Crack-induced damage significantly affects the chloride transport mechanism in cementitious materials. To quantitatively evaluate the crack effects, a coupled model was proposed in this paper for saturated cement paste with various uniaxial tensile damage. First, the 3D microstructure of hydrating cement paste was simulated based on a voxel-based hydration model, and its damaged spatiotemporal distribution under uniaxial tensile stress was simulated using a finite-element model. Based on the damaged cement paste, an electrical Modelling framework was presented to simulate the chloride transport. The results show that the damage spatiotemporal distribution in saturated cementitious materials with uniaxial tensile and its chloride transport evolution can be successfully modelled using the self-created model and coupled method. the damage of cementitious material is an accumulation process of cracks spread over the main crack. During the process, the crack connectivity and crack width affect chloride transport and its fracture-volume threshold value is 1.40%. Compared to studies published, the coupled model could well simulate chloride transport in saturated cementitious materials with uniaxial tensile damage.

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Section: Hydration Model For Cementitious Materialsmentioning

confidence: 99%

Section: Model Verificationmentioning

confidence: 99%

Modelling of Damage Spatiotemporal Distribution in Saturated Cementitious Materials and its Chloride Transport Evolution

Rusheng

Gao

et al. 2023

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“…Argon was used for the test, which has a dynamic viscosity of 2.25 × 10 −5 Pa⋅s at 20°C. In accordance with Qian et al [36], who investigated how parameters such as inlet and confining pressure alter the gas permeability of concrete, the inlet pressure was set to 15 bar to ensure accuracy and safety, and the gas permeability was tested at 3 MPa, 5 MPa, and 10 MPa for each specimen. The gas permeability coefficient K (m 2 ) was calculated according to Eq.…”

Section: Gas Permeabilitymentioning

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

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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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Effects of various inlet-gas mediums on apparent permeability of concrete under steady-state flow: Comparison between carbon-dioxide and oxygen

Qian

Liu

et al. 2021

Cement and Concrete Composites

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Investigation on parameters optimization for gas permeability testing of concrete: Inlet-gas pressure and confining pressure

Cited by 27 publications

References 37 publications

Modelling of Damage Spatiotemporal Distribution in Saturated Cementitious Materials and its Chloride Transport Evolution

Modelling of Damage Spatiotemporal Distribution in Saturated Cementitious Materials and its Chloride Transport Evolution

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

Effects of various inlet-gas mediums on apparent permeability of concrete under steady-state flow: Comparison between carbon-dioxide and oxygen

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