Mercury intrusion porosimetry theory and its application to air-entrained cement pastes and mortars

Cebeci, O.Z.

doi:10.31274/rtd-180817-4556

Cited by 3 publications

(4 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The techniques selected have been described as being highly reproducible [23,[31][32][33][34], and have been stated to be precise both method and material related [35]. Therefore, the same 4 cylinders of each composition have been tested in the different techniques according to the following sequence:…”

Section: Sequence Of Analysismentioning

confidence: 99%

Multiple characterization study on porosity and pore structure of calcium phosphate cements

2015

View full text Add to dashboard Cite

Being able to thoroughly characterize the intricate pore structure of calcium phosphate cements is a key step to successfully link the structural properties of these synthetic bone grafts with their most relevant properties, such as in vitro or in vivo behaviour, drug loading and release properties or degradation over time. This is a challenging task, due to the wide range of pore sizes compared to most other ceramic biomaterials. This work provides a critical assessment of three different techniques based on different physical phenomena, namely Mercury Intrusion Porosimetry (MIP), Nitrogen sorption and Thermoporometry (TPM) for the detailed characterization of four calcium phosphate cements with different textural properties, in terms of total porosity, Pore Size Distribution (PSD) and Pore Entrance Size Distribution (PESD). MIP had the advantage of covering a much wider size range than TPM and Nitrogen sorption, offering a more comprehensive information at the micrometric level. TPM, and specially Nitrogen sorption, besides being non-destructive techniques, and although covering a limited size range, provided complementary information regarding pore structure associated to crystal shape at the nanoscale, recording both PSD and PESD in a single experiment. MIP tended to register smaller sizes, especially at low L/P ratios, due to the network effect, that has a strong influence on the outcome of this technique.¡

show abstract

Section: Sequence Of Analysismentioning

confidence: 99%

Multiple characterization study on porosity and pore structure of calcium phosphate cements

2015

View full text Add to dashboard Cite

show abstract

“…was used to determine the porosity, pore-size distributioq and density of the samples. Due to its simplicity and versatility, this method has been employed in the determination of the pore-size distribution curves of a wide variety of porous materials(3).The surface tension of mercury (474 dynes/em) opposes its entrance into small openings; an opposition that externally applied pressure can overcome. Any time a liquid exhibits an angle of contact greater than 90°, it will resist wetting the solid and entering any pores.Reported contact angles between mercury and a large variety of materials have a most frequent value of 1300.…”

mentioning

confidence: 99%

“…Any time a liquid exhibits an angle of contact greater than 90°, it will resist wetting the solid and entering any pores.Reported contact angles between mercury and a large variety of materials have a most frequent value of 1300. In the absence of specific data, this value is usually employed(3,29).For a pore of circular cross-section, a force balance between the external pressure squeezing the liquid into the pores and the surface forces tending to squeeze the liquid out gives the following expression (20, 29). porous solid surrounded by liquid, as the pressure increases, the quantity of liquid forced into the pores increases in proportion to the differential pore volume.…”

mentioning

confidence: 99%

Kinetics of the chlorination of magnesium oxide

Hesson¹

1979

View full text Add to dashboard Cite

“…Generally, the MIP measurements are represented as a cylindrical pore size distribution by using the Washburn equation (Washburn 1921, Guo, et al 2016, Fang, et al 2018. But with a slight modification the Washburn equation can be used to calculate slit pore size distribution with a characteristic size b, which is more appropriate to define cleats than considering them as cylindrical pores (see equation 22 and 23 by Cebeci (1977)).…”

Section: Introductionmentioning

confidence: 99%

Dynamics of anisotropic permeability in coal seam gas reservoirs

Raza¹

View full text Add to dashboard Cite

In this work, the effect of stresses and the reservoir boundary conditions on the permeability anisotropy, mechanical properties and swelling/shrinkage of the coals will be examined.Permeability is the fundamental parameter to understanding and modelling the fluid flow in the porous coal, and thus crucial to estimating the commercial gas and water production from coal seam gas (CSG) reservoir. Although permeability is a primary parameter to determine the reservoir production, the fundamental research behind the permeability change during pressure drawdown is not extensively examined in context with reservoir stresses and boundaries which can directly affect the reservoir production estimates. This project provides a mean to understand permeability change in CSG reservoir by conducting experiments and modelling studies to relate coal permeability, mechanical properties and sorption behaviour to different reservoir stresses and boundary conditions.The first objective of this project was to manage the design, construct, and demonstrate a state of the art triaxial stress permeameter (TSP) to measure anisotropic-permeability and stress-strain on coal sample simultaneously. The TSP was designed to measure anisotropic permeability by rotating a 40 mm cubic coal sample in orthogonal direction so that permeability can be measured in directions that align with face cleats, butt cleats, and bedding-plane of the coal. TSP is used in a series of experiments on coal sample UQ-B1 from the Surat Basin to determine in the modulus of elasticity (E) and cleat compressibility (Cf) of the coal sample UQ-B1 (Chapter 4), measure permeability using helium and methane gases (Chapter 5), and the effect of using either constant-stress (free swelling) or constant-volume boundary conditions on the observed relationship between net stresses and permeability changes (Chapter 5).Chapter 4 reports experiments in the TSP to determine the modulus of elasticity (E) and cleat compressibility (Cf) of coal sample UQ-B1 at effective stresses of 0.5 -4.0 MPa. These experiments confirm that these coal properties are anisotropic and stress-dependent. The experimental data also shows that cleats become 'softer' as stress is reduced on the sample which can result in the permeability rise by increasing the cleat width. The calculated modulus of elasticity of the bulk coal was E1 = 4.35 GPa, E2 = 4.90 GPa and E3 = 7.06 GPa perpendicular to face cleat, butt cleat, and bedding-plane directions, respectively. The cleat compressibilities (Cf) calculated from the relationship of pore size to pore compressibility were Cf1=0.1102-0.0333MPa -1 perpendicular to the face cleats and Cf2=0.0588-0.0251MPa -1 perpendicular to butt cleats at effective stresses of σeff = 0.5 -4.0 MPa.

show abstract

Mercury intrusion porosimetry theory and its application to air-entrained cement pastes and mortars

Cited by 3 publications

References 7 publications

Multiple characterization study on porosity and pore structure of calcium phosphate cements

Multiple characterization study on porosity and pore structure of calcium phosphate cements

Kinetics of the chlorination of magnesium oxide

Dynamics of anisotropic permeability in coal seam gas reservoirs

Contact Info

Product

Resources

About