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相关概念视频

Maximum Size of Aggregate01:12

Maximum Size of Aggregate

238
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...
238
Types of Aggregate Grading01:15

Types of Aggregate Grading

823
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...
823
Aggregates Classification01:29

Aggregates Classification

387
Aggregate classification is generally based on its size, petrographic characteristics, weight, and source. Size classification ranges from coarse to fine aggregates, defined by the size of the particles. Coarse aggregates are particles that do not pass through ASTM sieve No. 4, and aggregates that pass through the sieve are fine aggregates.
Petrographic classification groups aggregates based on common mineralogical characteristics. Some of the common mineral groups found in aggregates are...
387
Design Example: Aggregate Gradation01:24

Design Example: Aggregate Gradation

149
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...
149
Mechanistic Models: Compartment Models in Algorithms for Numerical Problem Solving01:29

Mechanistic Models: Compartment Models in Algorithms for Numerical Problem Solving

102
Mechanistic models play a crucial role in algorithms for numerical problem-solving, particularly in nonlinear mixed effects modeling (NMEM). These models aim to minimize specific objective functions by evaluating various parameter estimates, leading to the development of systematic algorithms. In some cases, linearization techniques approximate the model using linear equations.
In individual population analyses, different algorithms are employed, such as Cauchy's method, which uses a...
102
Aggregate Cement Ratio01:21

Aggregate Cement Ratio

344
The Aggregate Cement ratio refers to the weight of aggregate divided by the weight of cement in a concrete mix. Altering this ratio has profound effects on the concrete's properties. This ratio plays a pivotal role in determining the strength, workability, and durability of concrete. When the Aggregate Cement ratio is higher, the mix is leaner, meaning it has less cement paste to lubricate the aggregate, potentially making the concrete less workable. Such mixes, known as lean, enhance the...
344

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相关实验视频

Updated: Sep 16, 2025

Automating Aggregate Quantification in Caenorhabditis elegans
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Automating Aggregate Quantification in Caenorhabditis elegans

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优化基于二进制粘贴聚合模型的聚合系统.

Chunming Lian1,2, Xiong Zhang1, Lu Han2

  • 1Key Laboratory of Advanced Civil Engineering Materials of Education Ministry, School of Material Science and Technology, Tongji University, 4800 Cao'an Road, Shanghai 201804, China.

Materials (Basel, Switzerland)
|July 12, 2025
PubMed
概括
此摘要是机器生成的。

本研究引入了一种新的混凝土混合设计方法,以优化聚合物比例,最大限度地减少粘合剂体积,以提高可持续性. 该方法提高了总包装密度,并考虑到颗粒形状,以确保可加工性和强度.

关键词:
聚合组合设计 聚合组合设计粒子间的距离是粒子间的距离.包装密度 包装密度 包装密度粘贴量最小化 粘贴量最小化特定的表面积特定的表面积.

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相关实验视频

Last Updated: Sep 16, 2025

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科学领域:

  • 土木工程 土木工程是指土木工程.
  • 材料科学 材料科学 材料科学
  • 可持续建筑 可持续建筑

背景情况:

  • 优化混凝土混合设计对于性能和可持续性至关重要.
  • 传统的方法通常依赖于经验数据或复杂的模型.
  • 尽量减少水泥糊的体积可以减少环境影响和成本.

研究的目的:

  • 开发一种系统和基于物理的方法来优化混凝土中的聚合比例.
  • 为了最大限度地减少粘合剂的体积,同时保持所需的可加工性和机械性能.
  • 为数据密集型建模方法提供实用和可解释的替代方案.

主要方法:

  • 使用了二进制粘贴聚合系统模型.
  • 通过排除细颗粒 (<75微米) 和纳入粒子间相互作用,精制聚合物包装密度计算.
  • 引入了修改后的聚合特异面积计算,考虑了分数内变化和粒子形态 (基于图像的形状系数).
  • 确定了粒子间距作为控制混凝土流动性的关键参数.

主要成果:

  • 开发了基于粒子间距的优化策略,以确定理想的聚合物组成.
  • 达到所需的间距与最小的糊口体积.
  • 实验验证证证实可靠的预测糊口需求,可加工性和压力强度.
  • 证明了该模型在可持续和高效的混凝土混合设计中的有效性.

结论:

  • 拟议的基于物理的方法为混凝土混合物设计提供了一种实用和可解释的方法.
  • 成功优化聚合物比例,以最大限度地减少粘贴量,同时确保性能.
  • 为混凝土混合设计提供了机器学习模型的可行替代方案,促进了可持续性.