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Related Concept Videos

Reinforcements in Concrete01:25

Reinforcements in Concrete

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Reinforced concrete is a composite material used extensively in construction, combining the compressive strength of concrete with the tensile strength of steel. This synergy is essential as concrete, while excellent at resisting compression, is weak under tension. Steel bars, or rebars, are embedded in the concrete to handle these tensile forces. The choice of steel is strategic; it shares a similar coefficient of thermal expansion with concrete, which ensures uniformity in response to...
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Fiber Reinforced Concrete01:22

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Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...
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Ferrocement

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Ferro-cement is a distinctive construction material that represents an innovative variant of reinforced concrete, characterized by its unique composition and the method by which it is formed. Unlike standard reinforced concrete, which relies on larger steel bars for reinforcement, ferro-cement utilizes densely packed layers of mesh or fine rods, fully encased in cement mortar. This composition allows for the creation of structures that are significantly thinner and more flexible than their...
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Three-Dimensional Analysis of Strain01:29

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Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...
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Design Example: Distributing Reinforcements in Concrete Sections01:22

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The topic explores the practical aspects of adjusting steel reinforcements within a concrete beam section to meet specific design requirements. When designing a reinforced concrete beam, it is essential to distribute the steel reinforcements properly to ensure structural integrity and efficiency. The example provided details a scenario where a beam requires a total steel cross-section of 4 square inches. The engineer identifies that the available steel bars have a nominal diameter of 1.693...
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Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding
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Three-Dimensional Rebar Graphene.

Junwei Sha1, Rodrigo V Salvatierra, Pei Dong

  • 1School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University , Tianjin 300350, China.

ACS Applied Materials & Interfaces
|February 4, 2017
PubMed
Summary
This summary is machine-generated.

Researchers developed robust 3D rebar graphene foams reinforced with carbon nanotubes. These materials exhibit exceptional mechanical strength and stable electrochemical performance for energy storage applications.

Keywords:
dynamic mechanical analysislithium ion capacitorpowder metallurgyrebar graphenethree-dimensional

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrochemistry

Background:

  • Developing advanced materials with enhanced mechanical and electrochemical properties is crucial for next-generation energy storage devices.
  • Graphene foams (GFs) offer high surface area and conductivity but often lack robust mechanical integrity.
  • Incorporating reinforcing agents can improve the structural stability and overall performance of graphene-based materials.

Purpose of the Study:

  • To synthesize free-standing, robust three-dimensional (3D) rebar graphene foams (GFs) using a powder metallurgy template method.
  • To investigate the effect of multiwalled carbon nanotubes (MWCNTs) as reinforcement on the mechanical and electrochemical properties of 3D GFs.
  • To evaluate the performance of the developed 3D rebar GFs as electrodes in lithium ion capacitors (LICs).

Main Methods:

  • Utilized a powder metallurgy template method involving sintered Ni skeletons and sucrose.
  • Incorporated MWCNTs as reinforcing bars within the graphene foam structure.
  • Characterized the mechanical properties (load-bearing capacity, modulus) and electrochemical performance (energy density, cycling stability) of the 3D rebar GFs.

Main Results:

  • Successfully fabricated 3D rebar GFs with high porosity and structural stability.
  • MWCNTs significantly improved the thermostability, storage modulus (290.1 kPa), and conductivity (21.82 S cm-1) of the 3D GFs.
  • The 3D rebar GFs demonstrated remarkable mechanical robustness, supporting over 3150× their weight without irreversible height change.
  • As electrodes in LICs, the 3D rebar GFs achieved an energy density of 32 Wh kg-1 with 78% energy density retention after 500 cycles.

Conclusions:

  • The developed 3D rebar graphene foams exhibit superior mechanical strength and stable electrochemical properties.
  • The integration of MWCNTs effectively enhances the performance of graphene foams for structural and electrochemical applications.
  • These robust 3D rebar GFs show significant potential for use in demanding devices requiring stable mechanical and electrochemical characteristics, such as advanced energy storage systems.