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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

645
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...
645
Types of Aggregate Grading01:15

Types of Aggregate Grading

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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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Design Example: Aggregate Gradation01:24

Design Example: Aggregate Gradation

284
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...
284
Sieve Analysis and Grading Curves01:19

Sieve Analysis and Grading Curves

892
Sieve analysis is a method used to determine the particle size distribution of aggregate materials. This process involves the following steps:
892
Unsoundness of Aggregate due to Volume Change01:26

Unsoundness of Aggregate due to Volume Change

336
Unsoundness in aggregates due to volume changes is primarily caused by the physical alterations aggregates undergo, such as freezing and thawing, thermal changes, and wetting and drying. Unsound aggregates, when subjected to these changes, result in volume change upon disintegration. This, in turn, contributes to the deterioration of concrete, including scaling, pop-outs, and cracking. Particular types of aggregates, such as porous flints, cherts, and those containing clay minerals, are...
336
Bonding and Strength of Aggregate01:12

Bonding and Strength of Aggregate

437
The bond between aggregate particles and the cement matrix is significantly influenced by the shape and surface texture of the aggregates. High-strength concretes benefit from a rougher texture, which leads to stronger bonding due to greater adhesion. Angular aggregates with larger surface areas also enhance this bond. The bonding quality, however, is complex to assess as no universally accepted test exists. Good bonding is indicated when a crushed concrete specimen shows some aggregate...
437

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関連する実験動画

Updated: Jan 9, 2026

Determination of Aggregate Surface Morphology at the Interfacial Transition Zone ITZ
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積層骨材の形状品質の画像ベース評価方法

Shaobo Ren1,2, Sheng Zeng3, Yi Zhou3

  • 1School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China.

Sensors (Basel, Switzerland)
|December 11, 2025
PubMed
まとめ

本研究では、粗骨材形状を評価するための自動化されたデジタル画像ベースの方法を導入し、舗装品質管理を向上させます。この新しい技術は、耐久性のある道路建設に不可欠な骨材の均一性を迅速かつ客観的に評価します。

キーワード:
骨材形状デジタル画像処理評価基準形状指数積層骨材標準偏差

さらに関連する動画

Bead Aggregation Assays for the Characterization of Putative Cell Adhesion Molecules
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Bead Aggregation Assays for the Characterization of Putative Cell Adhesion Molecules

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Generation of Aggregates of Mouse Embryonic Stem Cells that Show Symmetry Breaking, Polarization and Emergent Collective Behaviour In Vitro
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関連する実験動画

Last Updated: Jan 9, 2026

Determination of Aggregate Surface Morphology at the Interfacial Transition Zone ITZ
08:59

Determination of Aggregate Surface Morphology at the Interfacial Transition Zone ITZ

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Bead Aggregation Assays for the Characterization of Putative Cell Adhesion Molecules
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科学分野:

  • 土木工学
  • 材料科学
  • コンピュータビジョン

背景:

  • 粗骨材の形状は、舗装の性能と耐久性に大きく影響します。
  • 手動での骨材検査は時間がかかり、主観的であり、バルク材料には実用的ではありません。
  • 骨材生産における効率的な品質管理には、客観的かつ自動化された方法が必要です。

研究 の 目的:

  • 積層粗骨材の形状を評価するための自動化されたデジタル画像ベースの方法を開発すること。
  • 骨材の形態とバッチレベルの品質を評価するための定量的フレームワークを確立すること。
  • 骨材形状の均一性と舗装性能指標との相関関係を明らかにすること。

主な方法:

  • グレースケール変換、ヒストグラム均等化、ガウシアンフィルタリングを含む画像前処理。
  • Grahamスキャン凸包アルゴリズムを使用したセグメンテーションと輪郭再構築。
  • 形状係数とその標準偏差（σ）を計算するための形態学的パラメータの抽出。

主要な成果:

  • 新規の自動化された粗骨材形状評価システムを開発しました。
  • 自動測定と手動測定の間の平均相対誤差は15%未満でした。
  • 形状係数標準偏差（σ）と全体的な形状品質との強い相関関係が特定され、優れた、良好な、不良の3つの品質カテゴリにつながりました。

結論:

  • 提案されたσ駆動フレームワークは、骨材の形態の迅速、定量的、かつ客観的な評価を提供します。
  • この方法は、実践的な骨材生産と舗装品質管理プロセスを強化します。
  • 自動化された形状評価は、舗装システムの耐久性と性能を確保するために不可欠です。