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Fiber Reinforced Concrete01:22

Fiber Reinforced Concrete

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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Disentangling High Strength Copolymer Aramid Fibers to Enable the Determination of Their Mechanical Properties
06:02

Disentangling High Strength Copolymer Aramid Fibers to Enable the Determination of Their Mechanical Properties

Published on: September 1, 2018

All-aramid composites by partial fiber dissolution.

Jian Min Zhang1, Zeinab Mousavi, Nattakan Soykeabkaew

  • 1School of Engineering and Materials Science, Centre for Materials Research, Queen Mary University of London, Mile End Road, E1 4NS London, United Kingdom.

ACS Applied Materials & Interfaces
|April 2, 2010
PubMed
Summary
This summary is machine-generated.

Researchers developed novel self-reinforced composites using high-performance aramid fibers. This "all-aramid" material offers superior mechanical and thermal properties, suitable for demanding high-temperature applications.

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Experimental Implementation of a New Composite Fabrication Method: Exposing Bare Fibers on the Composite Surface by the Soft Layer Method

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Area of Science:

  • Polymer Science and Engineering
  • Materials Science
  • Composite Materials

Background:

  • Self-reinforced polymer composites are rapidly advancing.
  • Current materials often use moderate-performance thermoplastic fibers.
  • High-performance aramid fibers offer potential for enhanced composites.

Purpose of the Study:

  • To develop a new type of self-reinforced composite using high-performance aramid fibers.
  • To create an "all-aramid" composite with improved properties.
  • To investigate the potential for high-temperature applications.

Main Methods:

  • A surface-dissolution method using concentrated sulfuric acid (H2SO4) was applied to fuse poly(p-phenylene terephthalamide) (PPTA) fibers.
  • Partial dissolution of fiber surfaces created a PPTA interphase/matrix.
  • The composite was consolidated after acid extraction and drying.

Main Results:

  • Unidirectional composites with high reinforcement content (approx. 75 vol %) and good interfacial bonding were achieved.
  • The all-aramid composites exhibited a Young's modulus of ~65 GPa and tensile strength of 1.4 GPa at room temperature.
  • A high modulus (~50 GPa) was maintained up to 250°C due to the PPTA-based fiber, matrix, and interphase.

Conclusions:

  • The developed all-aramid composites match or surpass conventional aramid/epoxy composites in mechanical properties.
  • The use of PPTA for all composite components enables excellent thermal stability.
  • These materials show significant promise for high-temperature engineering applications.