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相关概念视频

Mortar01:29

Mortar

576
Mortar, a mixture of Portland cement, hydrated lime, sand, and water, is a crucial binding material in construction. Its primary function is to join masonry units together, filling gaps and ensuring a uniform distribution of weight across the structure. This helps in preventing potential weaknesses. Mortar also serves as a protective barrier against environmental elements such as water and wind, thereby safeguarding the interior of the structure. It also compensates for surface irregularities...
576
Mortar Properties01:17

Mortar Properties

432
Mortar properties encompass a range of characteristics crucial for construction and masonry work, including workability, water retention, bond strength, durability, compressive strength, volume change, and appearance. Workability refers to mortar's ability to be easily applied and manipulated without sagging or falling off surfaces, which is important for efficient masonry unit placement and alignment. Water retention is essential to prevent the mortar from losing moisture too quickly to...
432
Preplaced Aggregate Concrete01:29

Preplaced Aggregate Concrete

372
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...
372
Types of Cement II01:22

Types of Cement II

389
Portland blast-furnace cement is made by blending Portland cement clinker with granulated blast-furnace slag, which accounts for 25 to 65 percent of the cement's weight. Despite its similarities to ordinary Portland (Type I) cement in terms of fineness and setting times, its early strength is lower, though it achieves comparable strength later on. It's particularly suited for mass concrete structures and marine environments due to its lower heat of hydration and superior sulfate...
389
Shotcrete01:18

Shotcrete

426
Shotcrete is a specialized technique where mortar or small aggregate concrete rich in cement content is sprayed onto a surface at high velocity. The force of impact compacts the material and enables it to cling to vertical or overhead areas without sagging. The technique involves layering the shotcrete in stages until it reaches approximately 4 inches in thickness. Operator skill in nozzle management is pivotal in deciding the quality of the shotcrete. Shotcrete is used in constructing tunnel...
426
Accelerators01:17

Accelerators

269
Accelerators in concrete serve as admixtures to speed up the hardening process, enabling the concrete to achieve early strength faster. Although accelerators do not necessarily impact the time it takes concrete to set, they reduce this time in practice. A common accelerator is calcium chloride, which is particularly useful for hastening early strength development in cold weather or for rapid repair jobs that require quick heat generation after mixing.
The effectiveness of calcium chloride can...
269

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Preparation of Aligned Steel Fiber Reinforced Cementitious Composite and Its Flexural Behavior
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具有环氧涂层轻质聚合物的高性能砂用于海洋结构.

Jin-Su Kim1, Ho-Yeon Lee1, Jang-Ho Jay Kim1

  • 1School of Civil and Environmental Engineering, Yonsei University, 50, Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea.

Materials (Basel, Switzerland)
|September 27, 2025
PubMed
概括
此摘要是机器生成的。

这项研究开发了一种高性能砂,使用涂层人工轻质精细聚合物 (ALWFA) 来解决自然聚合物的枯竭问题. 环氧TiO2涂层显著改善了在海洋环境中的砂性能.

关键词:
人工轻质精细聚合物下面的灰下面的灰化物透阻力 化物透阻力高性能砂是高性能的砂.机械性能 机械性能 机械性能

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科学领域:

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

背景情况:

  • 全球不断增长的建筑需求正在耗尽混凝土的天然聚合物.
  • 由于环境挑战,海洋结构建设需要耐用,可持续的材料.
  • 来自工业废物的人工轻质细聚合物 (ALWFA) 提供了一个潜在的解决方案,但具有性能限制.

研究的目的:

  • 开发一种使用ALWFA作为天然聚合物的可持续替代品的高性能砂 (HPM).
  • 提高ALWFA的性能,用于海洋结构的保护层.
  • 调查环氧TiO2涂层对ALWFA的影响及其对HPM性能的影响.

主要方法:

  • 开发的ALWFA在内部和外部表面上涂有环氧二氧化 (TiO2).
  • 准备的高性能砂 (HPM) 样本使用不同比例的涂层和未涂层ALWFA.
  • 评估的HPM属性:孔隙性,压力强度,分裂拉伸强度和化物扩散系数.

主要成果:

  • 增加ALWFA的替换比率通常会降低砂性能.
  • 与未涂层的ALWFA相比,Epoxy-TiO2涂层的ALWFA显著改善了HPM特性.
  • 观察到的改善:多达4.13%的孔隙性减少,49.3%的压力强度增加,28.6%的分裂拉伸强度增加,52.0%的化物扩散系数改善.

结论:

  • 环氧TiO2涂层是一种有效的方法来增强ALWFA的物理性质.
  • 涂层ALWFA可以成功地纳入高性能砂,以实现可持续建筑.
  • 这种方法为可持续的海洋结构提供了有希望的解决方案,减轻了自然聚合物的枯竭.