01157611

Component

https://doi.org/10.3141/2142-10

http://scholar.google.com...sone&publication_year=2010

The discrete element method (DEM) was used to model nanoindentation of calcium silicate hydrate (C-S-H). The interparticle forces consisted of the traditional friction and contact forces that operate in granular materials, with the addition of nanometer-scale forces between gels, including van der Waals and electric double-layer forces. The contact normal forces were based on Hertz contact law. The van der Waals attractive forces were calculated on the basis of Hamaker’s equation. The electric double-layer forces, generated from the negative charges on the C-S-H gel surface and the ion species in the pore solution, were calculated by using Monte Carlo simulations. The particles are spherical with diameters of approximately 5 nm. Both elastic modulus and hardness, calculated from the DEM, were much smaller than the results from nanoindentation experiments. The effects of interparticle forces on the elastic modulus and hardness were studied to explore possible reasons for the differences. The simulations give insight into the morphology of C-S-H nanoparticles and the interparticle forces between C-S-H nanoparticles.

01157601

NANO10-0037

English

pp 67-74

2010

Transportation Research Record: Journal of the Transportation Research Board

9780309142779

Print

Figures (9) ; References (19) ; Tables (1)

Discrete element method; Hardness; Modulus of elasticity; Nanostructured materials; Simulation

Calcium silicate hydrate; Interparticle forces; Nanoindentation

Materials; I32: Concrete

TRIS, TRB, ATRI

May 27 2010 9:45AM

• American Road Map for Research for Nanotechnology-Based Concrete Materials
• Carbon Nanofiber–Reinforced Cement-Based Materials
• Direct Synthesis of Carbon Nanofibers on Cement Particles
• Distribution of Carbon Nanofibers and Nanotubes in Cementitious Composites
• Enhancement of Reactive Powder Concrete via Nanocement Integration
• Exploratory Investigation of Nanomaterials to Improve Strength and Permeability of Concrete
• Laboratory Assessment of a Self-Healing Cementitious Composite
• Molecular Dynamics Study of Interaction Between Corrosion Inhibitors, Nanoparticles, and Other Minerals in Hydrated Cement
• Molecular Dynamics to Understand the Mechanical Behavior of Cement Paste
• Nanocellulose and Microcellulose Fibers for Concrete
• Nanoengineering Ultra-High-Performance Concrete with Multiwalled Carbon Nanotubes
• Nanotechnology and Concrete: Concepts and Approach
• Nanotechnology to Manipulate the Aggregate–Cement Paste Bond Effects on Mortar Performance
• New Calcium Silicate Hydrate Network
• New Possibilities and Future Pathways of Nanoporous Thin Film Technology to Improve Concrete Performance
• Performance of Carbon Nanofiber–Cement Composites with a High-Range Water Reducer
• Scanning Transmission X-Ray Microscopic Study of Carbonated Calcium Silicate Hydrate
• Stability of Synthetic Calcium Silicate Hydrate Gels in Presence of Alkalis, Aluminum, and Soluble Silica
• Strength Enhancement of Cement Mortar with Carbon Nanotubes: Early Results and Potential