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Related Concept Videos

Pore Size Distribution01:23

Pore Size Distribution

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In concrete, the pore size distribution significantly influences the material's properties. Capillary pores, markedly larger than gel pores, form a vast network within partially hydrated cement paste, reducing the concrete's strength and increasing its permeability. This heightened permeability leads to a greater risk of damage from environmental factors like freeze-thaw cycles and chemical attacks, with the extent of vulnerability also being tied to the water-to-cement ratio.
Adequate...
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Sieve Analysis and Grading Curves01:19

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Sieve analysis is a method used to determine the particle size distribution of aggregate materials. This process involves the following steps:
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Porosity and Absorption of Aggregate01:20

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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...
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Shape and Texture of Coarse Aggregate01:25

Shape and Texture of Coarse Aggregate

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Aggregate shape is classified based on the relative sharpness or roundness of the edges and corners. This classification includes categories like rounded, angular, elongated, and flaky, each with specific characteristics. Rounded aggregates, fully shaped by attrition, are typical of river or seashore gravel, while angular aggregates, such as crushed rock, have well-defined edges. Aggregates that are elongated and flaky are less desirable, as they can reduce the workability and strength of...
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Types of Aggregate Grading01:15

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Aggregate grading is crucial in economically obtaining a concrete mix with adequate strength, reasonable workability, and minimal segregation. There are four types of aggregate gradation: well-graded, uniformly (or one-sized) graded, gap-graded, and open-graded.
Well-graded aggregates include a complete range of necessary size fractions that fit together to create a dense matrix with minimal voids, represented by a smooth, continuous gradation curve. This type of grading ensures good...
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Analysis and Specification of Starch Granule Size Distributions
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Pore Size Distribution in Granular Material Microstructure.

M Mahdi Roozbahani1, Rodrigo Borela2, J David Frost3

  • 1Computational Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA. mahdir@gatech.edu.

Materials (Basel, Switzerland)
|October 28, 2017
PubMed
Summary

This study introduces a novel pore scale modeling approach using Euclidean Distance Transform to accurately compute pore size distribution in granular materials. This method enhances understanding of fluid flow in porous media.

Keywords:
3D segmentation algorithmdigital material representationgranular material characterizationpore size distribution

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Area of Science:

  • Geosciences and Environmental Science
  • Computational Science and Engineering

Background:

  • Pore scale modeling is crucial for understanding fluid flow in porous media.
  • Accurate pore size distribution (PSD) is essential for predicting macroscale constitutive relationships.

Purpose of the Study:

  • To develop and validate a computational method for determining pore size distribution (PSD) in granular materials.
  • To analyze the influence of particle shape and packing on PSD.

Main Methods:

  • Utilized the Euclidean Distance Transform (EDT) for computing effective local pore size.
  • Employed local maxima search (non-maximum suppression) and segmentation for microstructure analysis.
  • Simulated synthetic packed particles and reconstructed real sand samples (Ottawa 20-30) for comparative analysis.

Main Results:

  • Successfully computed PSD for both synthetic and real granular materials.
  • Demonstrated the capability of the EDT-based method to handle non-trivial and non-spherical pore geometries.
  • Validated the approach using comparative models of packed particles.

Conclusions:

  • The developed pore scale modeling technique provides accurate PSD computation.
  • This method offers a robust tool for analyzing fluid flow through complex granular microstructures.
  • Findings contribute to improved predictions of porous media behavior in various applications.