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関連する概念動画

Shape and Texture of Coarse Aggregate01:25

Shape and Texture of Coarse Aggregate

255
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...
255
Types of Aggregate Grading01:15

Types of Aggregate Grading

690
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...
690
Sieve Analysis and Grading Curves01:19

Sieve Analysis and Grading Curves

475
Sieve analysis is a method used to determine the particle size distribution of aggregate materials. This process involves the following steps:
475
Design Example: Aggregate Gradation01:24

Design Example: Aggregate Gradation

141
The right type and quality of aggregates are crucial for concrete as they significantly influence its properties, mix proportions, and cost-effectiveness. If different sources are available for sand, the commonly used fine aggregate in concrete, the selection of sand is primarily based on its gradation.
The grading, or particle-size distribution, of sand is determined using sieve analysis, with standard sizes ranging from 150 μm to 10 mm (ASTM No. 100 sieve to 3⁄8 in. sieve). Sand is...
141
Bulk Density of Aggregate01:22

Bulk Density of Aggregate

572
Bulk density refers to the mass of aggregate particles that would fill a unit volume. The concept of bulk density originates from the inability to pack aggregate particles in a manner that completely eliminates void spaces. Hence, the term bulk refers to the volume that encompasses both the aggregates and the voids. This measurement is crucial when aggregates are batched by volume and is used to convert quantities by mass to volume.
Most natural mineral aggregates, like sand and gravel,...
572
Precipitate Formation and Particle Size Control01:16

Precipitate Formation and Particle Size Control

878
In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
878

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関連する実験動画

Updated: Aug 14, 2025

Image-based Lagrangian Particle Tracking in Bed-load Experiments
10:32

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ベッドロードの堆積物輸送における粒子の形の影響

Eric Deal1,2, Jeremy G Venditti3, Santiago J Benavides4,5

  • 1Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA. eric.deal@erdw.ethz.ch.

Nature
|January 11, 2023
PubMed
まとめ

粒子の形は床積載の堆積物輸送に大きく影響し,流量予測に影響する. 新しい理論と実験では 形状修正法が自然堆積物粒子の 精度を向上させています

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科学分野:

  • 地理科学
  • 環境科学
  • 物理学

背景:

  • 河川の復元と惑星探査に不可欠です
  • 沈殿物の流動の現在の予測は不正確で,粒子の大きさの変動が不確実性の主要な焦点である.
  • 沈殿物の輸送に対する粒子の形の影響は,輸送率における疑わしい役割にもかかわらず,ほとんど見過ごされている.

研究 の 目的:

  • ベッドロードの堆積物輸送における粒子の形状の役割を調査する.
  • 液体の抵抗と粒子の摩擦に対する粒子の形状の影響を考慮する理論的枠組みを開発する.
  • 予測の精度を向上させるために,形状修正された堆積物輸送法を提案する.

主な方法:

  • 牽引力と摩擦係数に対する粒子の形状効果を含む理論モデルの開発.
  • 理論的予測を検証する実験を行う.
  • 実験データと理論的な洞察に基づいた新しい堆積物輸送法を策定する.

主要な成果:

  • 粒子の形状は,既存のデータ分散と比較して,ベッド負荷輸送率を大幅に変化させることができます.
  • 抵抗と摩擦係数に基づく輸送の開始と効率に関する理論的予測が確認された.
  • 形状修正された堆積物輸送法が開発され,実験的な測定を成功裏に統一しました.

結論:

  • 床積載の沈殿物の輸送には,以前は過小評価されていた,重要な要素である.
  • 開発された理論と形状修正法は,堆積物輸送の予測の精度を高めます.
  • この発見は,球状粒子と自然堆積物粒子の振る舞いの間のギャップを埋めるのに役立ちます.