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Related Concept Videos

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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In concrete, the pore size distribution significantly influences the material's properties. Capillary pores, markedly larger than gel pores, form a vast network within partially hydrated cement paste, reducing the concrete's strength and increasing its permeability. This heightened permeability leads to a greater risk of damage from environmental factors like freeze-thaw cycles and chemical attacks, with the extent of vulnerability also being tied to the water-to-cement ratio.
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Aggregation of Calcium Silicate Hydrate Nanoplatelets.

Maxime Delhorme1,2, Christophe Labbez1, Martin Turesson1

  • 1ICB, UMR 6303 CNRS, Univ. Bourgogne Franche-Comté , FR-21000 Dijon, France.

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Calcium silicate hydrate (C-S-H) nanoplatelet aggregation on surfaces is driven by thermodynamic interactions. Particle surface charge dictates C-S-H aggregate structures and growth patterns, explaining cement material strength.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Computational Chemistry

Background:

  • Calcium silicate hydrate (C-S-H) is the primary component in cement, crucial for material strength.
  • C-S-H forms nanoscale platelets during early cement hydration.
  • These platelets aggregate on cement particles and other surfaces, influencing material properties.

Purpose of the Study:

  • To investigate the aggregation mechanisms of C-S-H nanoplatelets on surfaces.
  • To rationalize experimentally observed growth variations using thermodynamic principles.
  • To understand the role of surface charge in C-S-H aggregation and growth.

Main Methods:

  • Monte Carlo simulations
  • Molecular dynamics simulations
  • Thermodynamic equilibrium analysis
  • Surface charge density investigation

Main Results:

  • C-S-H nanoplatelet aggregation is governed by interaction free energies.
  • Observed growth dynamics can be explained by fundamental thermodynamic arguments.
  • Surface charge density is a key factor determining aggregate structures and growth modes.

Conclusions:

  • Thermodynamic principles effectively explain C-S-H nanoplatelet aggregation.
  • Surface charge density significantly influences the morphology and growth of C-S-H aggregates.
  • This study provides insights into the nanoscale mechanisms underlying cement hydration and strength.