Aggregate Size
Aggregate Size - Related Videos
01:12
Maximum Size of Aggregate
0 Views •
2024
The maximum size of aggregate is defined as the aperture of the sieve retaining 15 percent or more of the particles present in the aggregate sample. The aggregate's maximum size impacts the concrete's water requirement, workability, and strength. Larger aggregates reduce the surface area needing cement paste coverage, which can lower water needs, thereby allowing a decrease in the water-to-cement ratio when the desired workability and richness of the mix are to be maintained, which can result...
06:28
Aggregate Size Optimization in Microwells for Suspension-based Cardiac Differentiation of Human Pluripotent Stem Cells
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Cited by 11 •
2016
Conventional methods to initiate suspension aggregate based cardiac differentiation of human pluripotent stems cells (hPSCs) are plagued with culture heterogeneity with respect to aggregate size and shape. Here, we describe a robust method for cardiac differentiation employing microwells to generate size-controlled hPSC aggregates cultured under cardiac-promoting conditions.
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...
01:25
The Anchoring-and-Adjustment Heuristic
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2020
In order to make good decisions, we use our knowledge and our reasoning. Often, this knowledge and reasoning is sound and solid. However, sometimes, we are swayed by biases or by others manipulating a situation. For example, let’s say you and three friends wanted to rent a house and had a combined target budget of $1,600. The realtor shows you only very run-down houses for $1,600 and then shows you a very nice house for $2,000. Might you ask each person to pay more in rent to get the $2,000...
01:12
Adjusting a Traverse
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2025
In the site survey of a four-sided traverse, internal angles are essential to ensure geometric accuracy. The survey revealed that the sum of the measured internal angles was 359 degrees and 48 minutes, which is 12 minutes less than the expected 360 degrees. This discrepancy signals an error likely arising from measurement inaccuracies during the fieldwork.To rectify this error, the adjustment process involved distributing the 12-minute shortfall equally across the four internal angles. By...
FAQs
Aggregate size changes how particles arrange within a granular structure. A suitable size distribution can improve packing by reducing void content, while particle dimensions also affect contact areas and load transfer between grains. These effects matter because the resulting structure influences engineering behavior, including how well a material supports applied loads and maintains its designed performance.
Grading describes the proportions of coarse and fine particles across the measured size range, rather than focusing on one characteristic dimension. A broad distribution can alter packing and void content differently from a more uniform material. Engineers therefore examine the full distribution when relating aggregate structure to permeability, workability, and load-bearing behavior.
Changing particle size also changes surface area relative to the amount of material. That shift can affect workability and the void structure that surrounds the particles. In concrete and asphalt mix design, engineers use these relationships to select aggregate proportions that support the required construction performance, rather than judging a material by size alone.
To determine the size distribution, an engineer passes an aggregate sample through a sequence of sieves. Particles retained on each sieve are related to the corresponding particle diameter, and the retained masses are converted into proportions. Reviewing those proportions reveals how much coarse and fine material the sample contains across the measured range.
In drainage layers, aggregate size and grading help engineers evaluate the void structure and permeability needed for water movement. For earth-fill construction, the same measurements help characterize how particles pack and transfer loads. These applications use particle-size information as a design input, while the appropriate distribution depends on the intended construction function.
Results from particle-size analysis provide more than a size label. The distribution indicates the proportions of coarse and fine material, allowing engineers to connect aggregate structure with void content, surface area, workability, and permeability. In performance studies, those relationships help evaluate potential effects on strength, durability, and overall construction performance.