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関連する概念動画

Portland Cement01:21

Portland Cement

298
Portland cement is the essential binding ingredient in concrete, made from finely ground materials including lime, iron, silica, and alumina. Lime is derived primarily from limestone, marble, marl, seashells, and clays, which also supply iron and alumina, while silica is sourced from sand, chalk, and bauxite. Contemporary manufacturing of Portland cement is a significant source of carbon dioxide emissions, prompting research into reducing its content in concrete through alternative...
298
Hydration of Cement01:24

Hydration of Cement

384
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...
384
Additives and Fillers in Concrete01:29

Additives and Fillers in Concrete

132
Additives and fillers are integral to enhancing the properties of concrete. Pozzolans and blast-furnace slag are additives or admixtures due to their reactions with calcium hydroxide released during cement hydration. Fillers, which are finely ground and similar in fineness to Portland cement, improve concrete attributes such as workability density, and reduce capillary bleeding or cracking. Some fillers possess hydraulic properties or participate in benign reactions within the cement paste.
The...
132
Pozzolans01:21

Pozzolans

192
Pozzolans are siliceous or aluminous materials blended with Portland cement. They interact with the calcium hydroxide produced during the hydration of Portland cement and contribute to improved strength and durability of concrete. The pozzolanic activity, a measure of a pozzolan's effectiveness, is typically assessed using the strength activity index, as defined in ASTM C 618-93, which calculates the ratio of the compressive strength of cement mixtures with and without pozzolan.
Fly ash is...
192
Transition Zone01:28

Transition Zone

149
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...
149
Electrolysis03:00

Electrolysis

27.3K
In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
27.3K

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関連する実験動画

Updated: Sep 13, 2025

Operation of a 25 KWth Calcium Looping Pilot-plant with High Oxygen Concentrations in the Calciner
06:34

Operation of a 25 KWth Calcium Looping Pilot-plant with High Oxygen Concentrations in the Calciner

Published on: October 25, 2017

8.0K

ゼロギャップ電解器で石灰岩をセメントクリンカー前駆体に変換する

Tengxiao Ji1, Shaoxuan Ren1, Gaopeng Jiang1

  • 1Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z1, Canada.

Journal of the American Chemical Society
|July 28, 2025
PubMed
まとめ
この要約は機械生成です。

この研究は,水泥生産のための新しい電気化学反応炉を導入し,エネルギー需要を大幅に削減します. 新しい設計では,低電圧で石灰岩 (CaCO3) を効率的に分解し,従来のオーブンよりもグリーンな代替品を提供します.

さらに関連する動画

Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
11:14

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

Published on: February 21, 2017

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Development and Validation of Chromium Getters for Solid Oxide Fuel Cell Power Systems
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Development and Validation of Chromium Getters for Solid Oxide Fuel Cell Power Systems

Published on: May 26, 2019

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関連する実験動画

Last Updated: Sep 13, 2025

Operation of a 25 KWth Calcium Looping Pilot-plant with High Oxygen Concentrations in the Calciner
06:34

Operation of a 25 KWth Calcium Looping Pilot-plant with High Oxygen Concentrations in the Calciner

Published on: October 25, 2017

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Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
11:14

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

Published on: February 21, 2017

12.5K
Development and Validation of Chromium Getters for Solid Oxide Fuel Cell Power Systems
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Development and Validation of Chromium Getters for Solid Oxide Fuel Cell Power Systems

Published on: May 26, 2019

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科学分野:

  • 電気化学
  • 材料科学
  • 持続可能な製造

背景:

  • 工業用セメントの生産は,高温の石灰岩の分解により,炭素密度が高い.
  • CaCO3の変換のための既存の電気化学的方法は,非現実的に高い電圧 (> 4 V) を要求します.
  • 化学室によって引き起こされる従来の原子炉の高オーム抵抗は,重要な制限です.

研究 の 目的:

  • 石灰岩の分解のための低圧電気化学炉を開発する.
  • シメントの生産による 炭素排出量を減らすため
  • 既存の電気化学炉の設計の限界を克服する.

主な方法:

  • 膜でアノドとカトドを分離する2室の"ゼロギャップ"電解器を設計した.
  • 効率的な酸化と還元のための酸化還元媒介剤として (水素) 炭キノンを利用した.
  • 低電圧と高電流密度で電解機を操作する (100 mA cm-2で0.38 V).

主要な成果:

  • カルシウム炭酸 (CaCO3) を反応性のあるCa2+イオンに効率的に分解する.
  • 100 mA cm-2 で 0. 38 V の著しく低下した動作電圧を示した.
  • 100%の陽子効率を達成し 効果的なイオン輸送を示しています

結論:

  • 開発された"セメント電解機"は,セメント製造のための実用的で低エネルギーな解決策を提供します.
  • "ゼロギャップ"設計とリドックスメディエーターは,高い効率を達成するための鍵です.
  • この技術はセメント製造の炭素濃度を 大幅に削減する可能性を秘めています