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Related Concept Videos

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

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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...
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Updated: Sep 13, 2025

Operation of a 25 KWth Calcium Looping Pilot-plant with High Oxygen Concentrations in the Calciner
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Limestone Conversion to Cement Clinker Precursor in a Zero-Gap Electrolyzer.

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
Summary
This summary is machine-generated.

This study introduces a novel electrochemical reactor for cement production, significantly lowering energy requirements. The new design efficiently decomposes limestone (CaCO3) at low voltages, offering a greener alternative to traditional kilns.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Sustainable Manufacturing

Background:

  • Industrial cement production is carbon-intensive due to high-temperature limestone decomposition.
  • Existing electrochemical methods for CaCO3 conversion require impractically high voltages (>4 V).
  • High Ohmic resistance in conventional reactors, caused by chemical chambers, is a key limitation.

Purpose of the Study:

  • To develop a low-voltage electrochemical reactor for limestone decomposition.
  • To reduce the carbon footprint of cement production.
  • To overcome the limitations of existing electrochemical reactor designs.

Main Methods:

  • Designed a two-chamber "zero-gap" electrolyzer, separating anode and cathode chambers with a membrane.
  • Utilized (hydro)anthraquinones as redox mediators for efficient oxidation and reduction.
  • Operated the electrolyzer at a low voltage and high current density (0.38 V at 100 mA cm-2).

Main Results:

  • Achieved efficient decomposition of calcium carbonate (CaCO3) into reactive Ca2+ ions.
  • Demonstrated a significantly reduced operating voltage of 0.38 V at 100 mA cm-2.
  • Attained 100% proton efficiency, indicating effective ion transport.

Conclusions:

  • The developed "cement electrolyzer" offers a practical, low-energy solution for cement production.
  • The "zero-gap" design and redox mediators are key to achieving high efficiency.
  • This technology has the potential to substantially reduce the carbon intensity of cement manufacturing.