Aggregate Shape
Aggregate Shape - Related Videos
01:25
Shape and Texture of Coarse Aggregate
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2024
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...
05:40
An Orbital Shaking Culture of Mammalian Cells in O-shaped Vessels to Produce Uniform Aggregates
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Cited by 6 •
2019
Here we present a protocol for using O-shaped vessels, specialized for suspension cultures of cellular aggregates, with orbital shaking. The HEK293 cells grown in this bag form more homogeneous aggregates than those grown in conventional culture vessels.
10:10
Aggregates for Concrete and Asphaltic Mixes
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2023
Source: Roberto Leon, Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA Concrete and asphalt are by far the most common construction materials used today. Concrete is a composite material consisting of cement, water, air, coarse aggregate, and fine aggregates. Fine aggregates are typically sands and coarse aggregates are natural or crushed rocks. Chemical admixtures to modify certain specific properties are also commonly used (i.e., superplasticizers to make the...
16:24
Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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Cited by 13 •
2012
The goal of this experiment is to determine and control the size, shape and stability of self-assembled discotic amphiphiles in water. For aqueous based supramolecular polymers such level of control is very difficult. We apply a strategy using both repulsive and attractive interactions. The experimental techniques applied to characterize this system are broadly applicable.
03:37
Molecular Shape and Polarity
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2020
Dipole Moment of a Molecule Polar covalent bonds connect two atoms with differing electronegativities, leaving one atom with a partial positive charge (δ+) and the other atom with a partial negative charge (δ–), as the electrons are pulled toward the more electronegative atom. This separation of charge gives rise to a bond dipole moment. The magnitude of a bond dipole moment is represented by the Greek letter mu (µ) and is given by the formula shown here, where Q is the magnitude of the...
FAQs
Angular particles create stronger interparticle contact because their irregular profiles allow neighboring particles to engage and resist movement. This increased friction and mechanical interlocking can improve stability and resistance to deformation compared with more rounded particles. The effect is especially relevant when engineers need a mixture to maintain its structure under applied loads.
Rounded particles generally move past one another more easily, allowing granular mixtures to flow and compact more readily. Angular particles create greater friction and contact resistance, which can make placement or compaction more demanding while improving internal stability. Engineers therefore balance these characteristics according to whether workability, density, strength, or deformation resistance is the main design objective.
Flakiness and elongation describe particle proportions that affect how individual pieces fit within a mixture. These characteristics can change packing, void content, and the nature of particle contacts, which in turn influences density, friction, and mechanical interlocking. Evaluating both helps engineers identify shape distributions that support the intended performance of a composite material.
In concrete and asphalt mixtures, engineers consider particle shape alongside the desired workability, density, stability, strength, and resistance to deformation. A shape distribution that promotes efficient packing may reduce void content, while angularity can increase contact and interlocking. The selected balance helps the finished composite perform reliably without treating shape as an isolated material property.
For pavement bases, shape evaluation provides information about how particles may pack, interact, and resist movement within the granular layer. Angularity, roundness, flakiness, and elongation can be related to void content, friction, density, and deformation resistance. Engineers use this information to control material selection and support a stable base with predictable engineering performance.
Shape control allows engineers to adjust the balance between easy handling and structural stability rather than accepting the behavior of an uncontrolled aggregate mixture. By considering packing, surface area, friction, and interlocking, they can target suitable density, workability, strength, and deformation resistance. This approach supports reliable composite materials while helping use aggregate more efficiently in construction applications.