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相关概念视频

Types of Cement II01:22

Types of Cement II

85
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...
85
Hydration of Cement01:24

Hydration of Cement

171
Hydration of cement is a chemical reaction between cement particles and water. This process occurs primarily through two mechanisms: through-solution and topochemical. In the through-solution process, anhydrous compounds dissolve into their constituents, hydrates form in the solution, and then precipitate from the supersaturated solution. The topochemical process involves solid-state reactions at the cement particle surface. The through-solution process dominates the topochemical process at the...
171
Types of Cement I01:21

Types of Cement I

89
Portland cement comes in several types, each with distinct properties and applications based on their chemical composition and hydration characteristics:
Type I (Ordinary Portland Cement) is widely used for general construction where special properties are not required. It has moderate sulfate resistance and heat of hydration.
Type II (Modified Cement) offers moderate resistance to sulfate attack and a lower rate of heat development compared to Type I. It is suitable for structures in...
89
Preplaced Aggregate Concrete01:29

Preplaced Aggregate Concrete

88
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...
88
Superplasticizers01:30

Superplasticizers

72
Superplasticizers are advanced admixtures that enhance the workability of concrete by lowering the water content without compromising the strength of the material. These substances are highly effective water reducers, improving concrete flow, making it easier to work with, and enabling concrete to reach inaccessible areas or densely reinforced sections without mechanical vibration. The key components in superplasticizers are either sulfonated melamine or naphthalene formaldehyde condensates,...
72
Transition Zone01:28

Transition Zone

64
The transition zone in concrete is a critical area where aggregate meets cement paste, marked by a distinct porosity and weakness compared to the surrounding material. The adhesion around the aggregates is primarily due to Van Der Waals forces. The voids within this zone influence its robustness; initially, it is less durable than the surrounding bulk mortar due to larger voids. Initially, when concrete is compacted, a higher water-cement ratio near the aggregates leads to the formation of...
64

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相关实验视频

Updated: May 14, 2025

Production and Analysis of Sporosarcina pasteurii Biocement Bricks Using Custom 3D-Printed Molds for Unconfined Compression Tests
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Production and Analysis of Sporosarcina pasteurii Biocement Bricks Using Custom 3D-Printed Molds for Unconfined Compression Tests

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表面工程的热球封装了用于功能性水泥复合材料的相变材料.

Sahand Rahemipoor1, Carsten Kuenzel2, Toms Valdemārs Eiduks3

  • 1Department of Civil and Mechanical Engineering, Technical University of Denmark, Kgs Lyngby, 2800, Denmark.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|April 11, 2025
PubMed
概括

这项研究开发了新的微封装相变材料 (PCM),使用密封的层. 这种方法显著提高了节能建筑的机械强度,而不会影响热能储存.

关键词:
太空层 (cenospheres) 是一个太空层.蚀刻 蚀刻 蚀刻 是一种方法.接口 接口 接口 接口 接口分子动力学分子动力学阶段变化材料 阶段变化材料

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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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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:

  • 材料科学 材料科学 材料科学
  • 化学工程是化学工程的重要组成部分.
  • 可持续建筑技术 可持续建筑技术

背景情况:

  • 全球日益增长的能源需求需要节能建筑解决方案.
  • 微封装相变材料 (PCM) 提供被动热能存储,但在水泥材料中面临整合问题.
  • 薄弱的外强度和差的接口粘合阻碍了PCM集成,降低了机械性能.

研究的目的:

  • 从基于飞灰的层中开发功能化的微封装PCM,以提高界面兼容性.
  • 研究作为微封装PCM的新型密封材料,将其与标准胺-甲 (MF) 进行比较.
  • 提高建筑材料的机械强度和热能储能能力.

主要方法:

  • 合成微封装PCM使用基于飞灰的层,穿孔并用MF或密封.
  • 通过实验测试来评估机械性能.
  • 使用分子动态模拟来分析界面结合能量和拉伸强度.
  • 进行热分析以确认PCM的保存.

主要成果:

  • 与MF相比,密封提高了微封装PCM的机械强度50%以上.
  • 分子动力学模拟显示,酸与酸水合物的结合能量是MF的三倍以上.
  • 用密封的PCM表现出双倍以上的单轴拉伸强度.
  • 热分析证实,相变材料 (PCM) 的完整性在两种密封方法下都保持不变.

结论:

  • 用密封的功能化微封装PCM为水泥复合材料提供了优越的机械性能.
  • 这种新的方法克服了以前的局限性,使PCM能够有效地集成到建筑物中增强的热能储存中.
  • 这项研究为开发先进,节能建筑材料提供了一条变革性的途径.