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Related Concept Videos

Fiber Reinforced Concrete01:22

Fiber Reinforced Concrete

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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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Residual Stresses in Bending01:18

Residual Stresses in Bending

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In the study of elastoplastic members subjected to bending moments, understanding the loading and unloading phases is crucial for assessing material behavior and structural integrity. During the loading phase, as the bending moment increases, the material initially responds elastically, adhering to Hooke's Law, where stress is directly proportional to strain. When the load exceeds the yield strength, plastic deformation occurs, resulting in permanent strain and deformation that remains even...
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Carbonation Shrinkage01:24

Carbonation Shrinkage

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Atmospheric CO2 penetrates the concrete's pores and, in the presence of moisture, forms carbonic acid, which then reacts with calcium hydroxide in the hydrated cement, forming calcium carbonate. This process reduces the concrete's volume and is termed carbonation shrinkage.
The concrete's permeability is slightly reduced as calcium carbonate produced during the reaction fills its pores. Furthermore, its strength is slightly enhanced as the water released during the reaction...
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Bending of Members Made of Several Materials01:08

Bending of Members Made of Several Materials

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In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each...
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Bonding and Strength of Aggregate01:12

Bonding and Strength of Aggregate

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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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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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Bond Modification of Carbon Rovings through Profiling.

Paul Penzel1, Maximilian May2, Lars Hahn1

  • 1Institute of Textile Machinery and High Performance Material Technology (ITM), Technische Universität Dresden, 01062 Dresden, Germany.

Materials (Basel, Switzerland)
|August 26, 2022
PubMed
Summary
This summary is machine-generated.

Profiling carbon and textile reinforced concrete yarns enhances bond properties. This study introduces a new technique for yarn profiling, improving shear bond and overall resistance for better composite performance.

Keywords:
bond behaviorbond mechanismsbond testcarbon reinforced concreteprofiling technologytensile test

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Area of Science:

  • Materials Science
  • Civil Engineering
  • Composite Materials

Background:

  • Composite performance relies heavily on component bonding.
  • While bond mechanisms in traditional reinforced concrete are understood, carbon and textile reinforced concrete require further research due to numerous influencing factors.
  • The varying contributions of adhesive, frictional, and shear bond depend on fiber type, yarn processing, impregnation, geometry, and concrete properties.

Purpose of the Study:

  • To investigate the influence of yarn profiling on the bond and tensile behavior of composites.
  • To explore the potential of defined yarn profiling to increase shear bond (form fit) and control bond resistance.
  • To introduce a novel profiling technique for creating defined tetrahedral profiles on yarns.

Main Methods:

  • Development and application of a new profiling technique to create defined tetrahedral yarn profiles.
  • Conducting tensile and bond tests on yarns with varying profile characteristics, impregnation, and consolidation parameters.
  • Performing micrographic analysis of profiled yarns.

Main Results:

  • Profiled yarns exhibit superior bond properties compared to conventional smooth yarns.
  • A defined modification of bond properties is achievable by altering profile geometry, impregnation, and consolidation parameters.
  • The study demonstrates the effectiveness of the developed profiling technique.

Conclusions:

  • Defined yarn profiling significantly enhances bond properties in textile and carbon reinforced concrete.
  • The novel profiling technique offers a reliable method for controlling and improving composite performance.
  • Further research into optimizing profiling parameters can lead to advanced composite materials.