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相关概念视频

Preplaced Aggregate Concrete01:29

Preplaced Aggregate Concrete

137
Preplaced aggregate concrete is ideal for construction environments that are not easily accessible. The process begins by properly wetting the gap-graded coarse aggregates to remove the dirt, then placing it in the form and compacting it. Voids are filled with a mortar mix pumped under pressure through slotted pipes. This mortar typically consists of Portland cement, pozzolan, fine aggregates, water, and a fluidizing aid. The pozzolan helps reduce bleeding and segregation while improving the...
137
Design Example: Aggregate Gradation01:24

Design Example: Aggregate Gradation

147
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...
147
Aggregate Cement Ratio01:21

Aggregate Cement Ratio

328
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...
328
Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

120
This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.
120
Concrete01:20

Concrete

440
Concrete is a vital construction material extensively used worldwide, primarily valued for its strength, durability, and versatility, which it provides for various structural designs. Concrete generally comprises ingredients like Portland cement, coarse gravel, fine sand, and water. Concrete can be mixed by simple hand methods or industrially at computer-controlled plants. The mixture consists of aggregates and a paste made from water and Portland cement. This paste coats the aggregates and,...
440
Bonding and Strength of Aggregate01:12

Bonding and Strength of Aggregate

257
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...
257

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Determination of Aggregate Surface Morphology at the Interfacial Transition Zone ITZ
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低碳,低收缩混凝土设计基于粘贴聚合物二元模型.

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 30, 2025
PubMed
概括

本研究介绍了一种混凝土混合物设计方法,使用粘合剂-聚合物二元框架来降低粘合剂含量. 通过控制粒子间距 (SPT) 和糊状质学来实现最佳性能,以提高可加工性和强度.

关键词:
混凝土混凝土混合设计设计低碳混凝土是一种低碳混凝土.粘贴聚合二进制模型.收缩控制 控制收缩的控制

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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
  • 类风病学 类风病学 类风病学

背景情况:

  • 传统的混凝土混合设计通常涉及经验方法.
  • 优化混凝土性能需要了解粘贴和聚合物之间的相互作用.
  • 减少粘合剂含量对于可持续性和降低碳足迹至关重要.

研究的目的:

  • 开发基于性能的混凝土混合设计方法,使用粘贴-聚合二元框架.
  • 为了建立粒子间距 (SPT),粘合物流学和新鲜混凝土特性之间的关系.
  • 根据糊状特征创建混凝土强度的预测模型.

主要方法:

  • 在混合设计中使用了粘贴-聚合物二进制框架.
  • 研究了粒子间距 (SPT) 和糊状质学 (产量应力,塑料粘度) 对沉和分离阻力的影响.
  • 开发了一种两级强度模型,将糊状物质 (紧度,水化) 与混凝土强度相关联.

主要成果:

  • 新鲜混凝土的行为是由SPT和粘贴类风学决定的,随着SPT的出现,幅非线性地增加.
  • 在20-35μm SPT附近观察到低谷的关键过渡区.
  • 粘贴产量压力决定了低落,而塑料粘度控制了分离阻力.
  • 强度模型实现了高的预测准确性 (R2 = 0.90).
  • 确定了25μm的最佳SPT,以平衡流动性并最大限度地减少糊口体积.

结论:

  • 粘贴-聚合物二元框架为混凝土混合物设计提供了一个物理可解释和实用的方法.
  • 这种方法可以减少粘合剂含量,从而产生可持续的,低碳,低收缩的混凝土.
  • 该研究成功地将聚合物包装优化与粘贴校准脱,以实现高效的设计.