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Related Concept Videos

Strength of Cement01:20

Strength of Cement

145
Strength tests for cement are not performed directly on neat cement paste due to difficulty in obtaining consistent, reliable specimens. Instead, cement is typically tested in the form of cement-sand mortar.
For compressive strength tests, ASTM C 109-05 standards prescribe a cement-sand mix ratio of 1:2.75 and a water/cement ratio of 0.485 for making 2-inch cubes. These cubes are mixed, cast, and cured in saturated lime water at 23°C until testing. Flexural strength testing, outlined in...
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Dynamic Modulus of Elasticity of Concrete01:16

Dynamic Modulus of Elasticity of Concrete

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The dynamic modulus of elasticity assesses how a concrete structure deforms under impact or dynamic loads. It is typically higher than the static modulus of elasticity, measured under slow, steady loading conditions.
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by...
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Bonding and Strength of Aggregate01:12

Bonding and Strength of Aggregate

200
The bond between aggregate particles and the cement matrix is significantly influenced by the shape and surface texture of the aggregates. High-strength concretes benefit from a rougher texture, which leads to stronger bonding due to greater adhesion. Angular aggregates with larger surface areas also enhance this bond. The bonding quality, however, is complex to assess as no universally accepted test exists. Good bonding is indicated when a crushed concrete specimen shows some aggregate...
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Related Experiment Video

Updated: Jul 11, 2025

Aesthetically Enhanced Silica Aerogel Via Incorporation of Laser Etching and Dyes
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Strong yet flexible ceramic aerogel.

Lei Su1, Shuhai Jia2, Junqiang Ren3

  • 1State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, China.

Nature Communications
|November 4, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed a strong, flexible ceramic aerogel using SiC-SiOₓ nanowires. This advanced material offers excellent thermal insulation and mechanical properties, overcoming limitations of traditional ceramic aerogels.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Thermal Engineering

Background:

  • Ceramic aerogels offer excellent thermal insulation but suffer from brittleness and low strength, limiting their applications.
  • Existing flexible aerogels address brittleness but often lack sufficient mechanical strength for load-bearing uses.

Purpose of the Study:

  • To design and fabricate a novel ceramic aerogel with enhanced mechanical properties and thermal insulation.
  • To overcome the limitations of brittleness and low strength in conventional and flexible aerogels.

Main Methods:

  • Fabrication of a laminated SiC-SiOx nanowire aerogel structure.
  • Characterization of mechanical properties including compressibility, buckling deformation, and tensile strength.
  • Evaluation of thermal stability across a wide temperature range (-196°C to >1200°C) and thermal conductivity measurement.

Main Results:

  • The developed aerogel exhibits reversible compressibility and recoverable buckling deformation.
  • Achieved high strength, an order of magnitude greater than other ceramic aerogels.
  • Demonstrated excellent thermal stability and low thermal conductivity (39.3 ± 0.4 mW m⁻¹ K⁻¹).

Conclusions:

  • The laminated SiC-SiOx nanowire aerogel presents a breakthrough in mechanical robustness and flexibility.
  • This material shows significant promise for applications requiring high-performance, mechanically stable thermal insulation.
  • The integrated properties pave the way for advanced flexible thermal insulation solutions.