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関連する概念動画

Types of Cement II01:22

Types of Cement II

166
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...
166
Fineness of Cement01:15

Fineness of Cement

215
The fineness of cement directly influences the rate of hydration, as the hydration begins at the surface of the cement particles. In addition to hydration, the fineness of cement is vital for various properties of concrete including workability, gypsum requirement, and long-term behavior. The fineness of cement is represented in terms of the specific surface of cement which is typically measured in square meters per kilogram, with several methods available for this determination.
Direct...
215
Superplasticizers01:30

Superplasticizers

116
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,...
116
Mass Concreting01:22

Mass Concreting

108
Mass concreting refers to the process of placing large volumes of concrete, such as in gravity dams. The heat generated during the cement hydration process and differential cooling rates within the concrete mass can lead to a temperature gradient, which can result in thermal cracks in the concrete mass.
To reduce the risk of such cracking, the concrete mix may incorporate low-heat cement and pozzolans to reduce the temperature rise. Pre-cooled angular aggregates and water-reducing admixtures...
108
Hydration of Cement01:24

Hydration of Cement

380
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...
380
Porosity in Cement Paste01:18

Porosity in Cement Paste

223
The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
The balance of water to cement in the mix is...
223

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関連する実験動画

Updated: Sep 10, 2025

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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拡張可能な超冷却セメント

Guo Lu1, Fengyin Du1,2, Zhen Wang1

  • 1State Key Laboratory of Engineering Materials for Major Infrastructure, School of Materials Science and Engineering, Southeast University, Nanjing 211189, China.

Science advances
|August 20, 2025
PubMed
まとめ

研究者は持続可能な建物の冷却のための新しい冷却セメントを開発しました. この耐久性のある高性能素材は 温度を大幅に低減し 潜在的に負の炭素排出量をもたらします

さらに関連する動画

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Scalable Solution-processed Fabrication Strategy for High-performance, Flexible, Transparent Electrodes with Embedded Metal Mesh
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関連する実験動画

Last Updated: Sep 10, 2025

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科学分野:

  • 材料科学
  • 土木工学
  • 持続可能な技術

背景:

  • 日間放射性冷却 (PDRC) 材料は持続可能な建物の冷却ソリューションを提供します.
  • 耐久性のあるスケーラブルなPDRC構造材料の開発には課題があります.

研究 の 目的:

  • メタサーフェス強化冷却セメントを合成して 建設工程に使う
  • 耐久性,展開,スケーラビリティの観点から現在のPDRC材料の限界に対処します.

主な方法:

  • 低炭素セメント生産過程で,普遍的でスケーラブルな圧力駆動型製造戦略が採用されました.
  • メタ表面の強化は,反射性エトランジットと階層的な毛穴の自己組み立てによって達成されました.
  • 材料の性質は,太陽反射率,中赤外線放射性,強度,厳しい条件への耐性で特徴付けられました.

主要な成果:

  • フォトニックアーキテクチャのセメントは高い太陽反射率 (96.2%) と中赤外線放射性 (96.0%) を達成した.
  • 昼間の条件で5.4°Cの温度低下が記録された (850 W/m2の太陽の強度).
  • このセメントは,固有の高強度,耐磨性,および様々な厳しい曝露下での光学的な安定性を示した.

結論:

  • 開発された冷却セメントは,持続可能な建物の冷却のための有望で耐久性があり,スケーラブルなソリューションです.
  • 材料は優れた性能と耐久性を発揮し,要求の高い土木施工用途に適しています.
  • 機械学習によるライフサイクルの評価は,この革新的な材料の潜在的純負の炭素排出プロファイルを示唆しています.