Porosity Assessment
Porosity Assessment - Related Videos
13:02
Archimedes-Based Glycerol Displacement for Electrode Porosity Measurement in Lead-Acid Batteries
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2026
Here, we present a simple and low-cost glycerol displacement method based on Archimedes' principle for measuring lead-acid battery electrode porosities. The method demonstrates good reproducibility and is safer than traditional techniques, requiring low-hazard chemicals and equipment. Combining the technique with microstructural analysis by X-ray diffraction provides information on battery electrode properties and degradation.
01:20
Porosity and Absorption of Aggregate
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2024
Aggregates contain pores of varying sizes; while some are completely enclosed within the particles, others open onto the surface, allowing water to penetrate. The porosity of aggregates is a major factor contributing to the overall porosity of concrete, given that aggregates constitute about three-quarters of concrete's volume. When all pores in an aggregate are filled with water, the aggregate is considered saturated and surface-dry. If left in dry air, water will evaporate until the aggregate...
01:18
Porosity in Cement Paste
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2024
The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume. The balance of water to cement in the mix is critical—it...
11:52
Microbubble Fabrication of Concave-porosity PDMS Beads
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Cited by 2 •
2015
Procedures used to generate microstructured concave-porosity polydimethylsiloxane beads are presented. Effects of electrolyte concentration and identity within the aqueous phase are particularly emphasized.
09:22
Casting Protocols for the Production of Open Cell Aluminum Foams by the Replication Technique and the Effect on Porosity
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Cited by 22 •
2014
Replication is one of the processing techniques used for the production of porous metal sponges. In this paper one implementation of the method for the production of open celled porous aluminum is shown in detail.
FAQs
These features determine how much of the internal void space can be characterized and whether fluids can reach it. Pore size describes the dimensions of openings, distribution shows how those openings are arranged, and connectivity indicates whether they form continuous pathways. Considering all three helps distinguish materials with similar overall pore volume but different permeability, transport behavior, or durability.
Fluid accessibility shows whether a measured fluid can enter the material’s internal openings. Accessible pores contribute to fluid uptake and transport measurements, whereas inaccessible or poorly connected voids may not respond in the same way. Interpreting this distinction prevents engineers from treating all void space as functionally equivalent when evaluating permeability, density, strength, or movement of fluids and gases.
Porosity focuses on the proportion of void space, while density reflects the relationship between mass and volume and permeability concerns the ease of fluid movement. These properties are related but not interchangeable. A material’s pore connectivity and arrangement can influence permeability, while its measured porosity may also help explain performance without fully predicting transport or mechanical behavior.
Mass, volume, and fluid uptake provide the principal measurement bases described for porosity assessment. Mass and volume measurements support calculations involving the material’s bulk dimensions, while fluid uptake indicates how internal openings interact with an accessible fluid. Combining appropriate measurements with information about pore size, distribution, connectivity, and accessibility produces a more informative evaluation than relying on one value alone.
First, identify the material and the engineering property of interest, such as permeability, density, strength, durability, or transport behavior. Next, characterize relevant pore features and collect suitable mass, volume, or fluid-uptake measurements. Finally, interpret the pore volume in relation to connectivity and fluid accessibility, then use the results to support material selection, quality control, or failure analysis.
Engineers use the results when internal void space may affect how a material performs in service. The assessment can compare candidate materials, check whether manufactured components meet expected characteristics, or identify variation during quality control. It also supports decisions involving soils, rocks, ceramics, concrete, and other materials where density, fluid movement, durability, or structural performance matters.
During failure analysis, porosity data can help relate a material’s internal void structure to its observed performance. Measurements may reveal differences in pore volume, distribution, connectivity, or fluid accessibility that correspond with changes in strength, durability, density, or transport behavior. This information gives engineers a basis for examining whether internal structure contributed to an unexpected material or component outcome.