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Molecular Dynamics Simulation of Silane Inserted CSH Nanostructure.

Fei Yang1, Yangyang Cui1, Anming She2

  • 1School of Architectural and Civil Engineering, Zhongyuan University of Technology, Zhengzhou 450007, China.

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Summary
This summary is machine-generated.

Molecular dynamics simulations reveal that 3-(aminopropyl)triethoxysilane (3-APTES) significantly enhances calcium-silicate-hydrate (CSH) properties. This intercalation improves CSH toughness, tensile strength, and microstructure by altering its fracture process.

Keywords:
calcium silicate hydratemean azimuth shiftmolecular dynamics simulationtensile property

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Area of Science:

  • Materials Science
  • Computational Chemistry
  • Nanotechnology

Background:

  • Calcium-silicate-hydrate (CSH) is a critical binder in cementitious materials, but its inherent brittleness limits applications.
  • Improving the mechanical properties of CSH, such as toughness and tensile strength, is crucial for advanced construction materials.

Purpose of the Study:

  • To investigate the toughening mechanism of 3-(aminopropyl)triethoxysilane (3-APTES) intercalation within CSH structures.
  • To quantify the effects of 3-APTES on the tensile properties, toughness, and microstructure of CSH.
  • To explore the influence of varying Ca/Si ratios on 3-APTES intercalation and CSH properties.

Main Methods:

  • Molecular dynamics (MD) simulations were employed to model CSH structures, specifically using an 11 Å-tobermorite model.
  • The study utilized a CVFF force field and an NVT system at a constant temperature of 298 K.
  • Key properties simulated included tensile properties, toughness, adsorption energy, average orientation displacement, and radial distribution function.

Main Results:

  • 3-APTES intercalation was found to alter the fracture process of CSH, leading to enhanced tensile properties and toughness.
  • The presence of 3-APTES increased the energy required for CSH destruction and improved adsorption energy.
  • 3-APTES increased atom density within the CSH structure, and higher Ca/Si ratios promoted Ca-O bond formation and aggregation.

Conclusions:

  • 3-APTES organic compounds effectively improve the tensile strength, toughness, and adsorption properties of CSH.
  • Intercalation of 3-APTES leads to significant microstructural improvements in CSH.
  • The findings suggest 3-APTES as a promising additive for enhancing the performance of CSH-based materials.