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Related Concept Videos

Portland Cement01:21

Portland Cement

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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...
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Hydration of Cement01:24

Hydration of Cement

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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...
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Types of Cement II01:22

Types of Cement II

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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...
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Fineness of Cement01:15

Fineness of Cement

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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...
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Pozzolans01:21

Pozzolans

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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...
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Strength and Heat of Hydration01:29

Strength and Heat of Hydration

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The hydration of cement is an exothermic reaction in which heat is generated as cement hydrates. This heat of hydration is critical to cement's strength development. The rate at which this heat is generated affects the temperature rise, with a majority of the heat being released early in the hydration process, half within the first three days, and about 75% within the first week.
The heat of hydration for each cement compound is significant; for instance, tricalcium aluminate (C3A) and...
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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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Equivalent Cement Clinker Obtained by Indirect Mechanosynthesis Process.

Rabah Hamzaoui1, Othmane Bouchenafa1

  • 1Institut de Recherche en Constructibilité IRC, ESTP, Université Paris-Est, 28 Avenue du Président Wilson, 94234 Cachan, France.

Materials (Basel, Switzerland)
|November 13, 2020
PubMed
Summary

Indirect mechanosynthesis enables the formation of key cement clinker compounds at 900°C, significantly lower than the conventional 1450°C. This process offers a novel pathway for producing cementitious materials more efficiently.

Keywords:
cement clinkerclinkerizationcrystalline structuresindirect mechanosynthesisnanostructured materials

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Mineral Processing

Background:

  • Conventional cement clinker production requires high temperatures (1450°C).
  • Limestone and clay (kaolinite) are primary raw materials for cement.
  • Optimizing synthesis conditions is crucial for energy efficiency.

Purpose of the Study:

  • To investigate the effects of heat treatment, milling time, and indirect mechanosynthesis on limestone/clay mixtures.
  • To analyze the structural and thermal modifications induced by these processes.
  • To compare the synthesis temperature of clinker constituents via indirect mechanosynthesis versus conventional methods.

Main Methods:

  • X-ray Diffraction (XRD) for phase identification.
  • Thermogravimetric Analysis (TGA) for thermal properties.
  • Fourier-Transform Infrared Spectroscopy (FTIR) for structural analysis.
  • Particle Size Distribution (PSD) analysis.
  • Scanning Electron Microscopy (SEM) for microstructural observation.

Main Results:

  • Indirect mechanosynthesis, combining mechanical activation and heat treatment at 900°C, successfully formed key clinker phases.
  • The synthesized clinker constituents include Alite (C₃S), Belite (C₂S), Tricalcium Aluminate (C₃A), and Tetracalcium Aluminoferrite (C₄AF).
  • These phases were achieved at a significantly lower temperature (900°C) compared to conventional clinker production (1450°C).

Conclusions:

  • Indirect mechanosynthesis is an effective method for producing cement clinker constituents at substantially reduced temperatures.
  • This approach offers potential for significant energy savings in cement production.
  • The study demonstrates the feasibility of forming equivalent clinker powder at 900°C through combined mechanical and thermal activation.