Aggregate Porosity
Aggregate Porosity - Related Videos
01:20
Porosity and Absorption of Aggregate
0 Views •
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...
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.
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
Particle size distribution affects how aggregate particles occupy space and how packing arrangements develop. A mixture with varied particle sizes can produce a different void structure from one dominated by particles of similar size. That change influences bulk density, permeability, and the movement of water or air, making gradation an important consideration in aggregate selection and mixture design.
Internal pores belong to the aggregate particles, whereas other voids occur between neighboring particles. These two pore locations can influence fluid behavior differently, especially when voids remain interconnected. Their combined effect helps determine water absorption, permeability, and the extent to which moisture can move through an aggregate system used in concrete, asphalt, soils, or other composites.
Particle shape and surface texture affect how particles contact one another and arrange within a granular material. Those characteristics can alter the amount and continuity of void space, rather than changing porosity through particle size alone. The resulting structure influences bulk density and fluid transport, so engineers consider these features when controlling aggregate performance.
Engineers use porosity information to select aggregates and optimize mixture designs for concrete, asphalt, soils, and related composites. It helps anticipate bulk density, permeability, and water absorption, which are important performance characteristics. Evaluating this property also supports decisions intended to improve durability when materials may experience moisture, freezing, or chemical exposure.
Porosity measurements help characterize the void structure that governs how an aggregate system stores or transmits water and air. Interpreted alongside the material's intended use, the results can support predictions of fluid transport, water absorption, bulk density, and related performance. This information gives engineers a basis for comparing materials and refining mixture proportions.
Controlling porosity helps manage the amount and connectivity of void space available for moisture and other fluids. In concrete, asphalt, soils, and composite materials, this control can support more suitable permeability and water absorption characteristics. It is particularly relevant where moisture, freezing, or chemical exposure could contribute to damage and reduce long-term durability.