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相关概念视频

Design Example: Aggregate Gradation01:24

Design Example: Aggregate Gradation

91
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...
91
Types of Aggregate Grading01:15

Types of Aggregate Grading

428
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...
428
Toughness and Hardness of Aggregate01:22

Toughness and Hardness of Aggregate

248
Toughness and hardness are critical properties of aggregate materials used in concrete, particularly on pavement surfaces and industrial flooring subjected to heavy loads. Toughness is defined as the aggregate's resistance to failure by impact and is measured by the aggregate impact value (AIV). For this, the aggregate impact value test is performed, wherein the impact is delivered by a standard hammer, which falls freely under its own weight onto the aggregates. The aggregates fragment in...
248
Abrasion Resistance of Concrete01:23

Abrasion Resistance of Concrete

107
Abrasion resistance is an essential characteristic of concrete that determines its durability and longevity under various wear conditions. Concrete surfaces are vulnerable to different types of abrasion. For instance, surfaces may wear down due to the constant movement of vehicles or be eroded by solids carried in water, as seen in concrete canal linings. Specific tests are conducted to measure the abrasion resistance of concrete.
One such test is the revolving disc test, where three plates...
107
Aggregates Classification01:29

Aggregates Classification

305
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...
305
Bonding and Strength of Aggregate01:12

Bonding and Strength of Aggregate

140
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...
140

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相关实验视频

Updated: Jun 9, 2025

Preparation of Aligned Steel Fiber Reinforced Cementitious Composite and Its Flexural Behavior
11:07

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稳定循环聚合基材与双灰色组件的性能研究.

Kai Wang1,2, Xianhu Hu3, Yingjie Yuan2

  • 1College of Transportation, Shandong University of Science and Technology, Qingdao 266590, China.

Materials (Basel, Switzerland)
|October 26, 2024
PubMed
概括

回收建筑废弃物显示出出色的实际道路性能,符合基层建筑的高速公路标准. 这项研究验证了在城市道路项目中使用这些材料的可行性.

关键词:
基本材料是基础材料.建筑废弃物建筑废弃物石灰飞灰是什么意思路面表现的表现路面表现测试段的测试部分.

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Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
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The Effect of Construction and Demolition Waste Plastic Fractions on Wood-Polymer Composite Properties
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相关实验视频

Last Updated: Jun 9, 2025

Preparation of Aligned Steel Fiber Reinforced Cementitious Composite and Its Flexural Behavior
11:07

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Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
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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
  • 环境工程 环境工程

背景情况:

  • 城市道路建设面临着传统材料采购和废物处理的挑战.
  • 建筑垃圾对环境造成重大负担,也是潜在的资源.
  • 在道路分站中利用回收建筑垃圾提供了一个可持续的替代方案.

研究的目的:

  • 评估回收建筑废弃物材料的实际道路性能.
  • 调查建筑技术和在城市道路子基础上使用这些材料的可行性.
  • 分析基于回收材料的子基的机械性能和长期耐用性.

主要方法:

  • 室内实验室测试:选分析和不受限制的压力强度测试.
  • 在现场进行实地测试:定期采集核心样本,压缩测试和反弹偏移测试.
  • 基于"建设高速公路铺路基层的技术规范" (JTG/T F20-2015) 的绩效评估.

主要成果:

  • 回收混合物的颗粒分级与目标规格相匹配.
  • 达到适合重型交通的7天不限压力强度,14天的压力强度达到7MPa.
  • 核心样本证实了良好的聚合物分级,形状,厚度和强度;压缩和偏斜测试表明良好的抗变形能力.

结论:

  • 回收建筑废弃物材料在技术上是可行的,用于城市道路的基础建设.
  • 这些材料满足了对强度和性能的严格高速公路技术要求.
  • 这种方法提供了一种可持续和可行的解决方案,用于管理建筑垃圾,同时建立强大的基础设施.