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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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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
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Published on: January 7, 2019

Fiber-optic epoxy composite cure sensor. II. Performance characteristics.

K Y Lam, M A Afromowitz

    Applied Optics
    |November 10, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study presents an epoxy cure sensor that monitors composite curing. The fiber-optic sensor accurately predicts gel time and cure completion without calibration, even in varied epoxy systems.

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    Area of Science:

    • Materials Science
    • Chemical Engineering
    • Polymer Science

    Background:

    • Fiber-optic sensors offer a non-destructive method for monitoring composite material curing.
    • Epoxy resin reaction kinetics are critical for understanding and controlling the curing process.
    • Accurate monitoring of epoxy cure is essential for ensuring composite performance and structural integrity.

    Purpose of the Study:

    • To develop and validate a fiber-optic epoxy cure sensor.
    • To model the performance characteristics of the epoxy cure sensor based on reaction kinetics.
    • To demonstrate the sensor's capability in predicting gel point and monitoring cure progression.

    Main Methods:

    • Characterization of epoxy reaction kinetics, identifying it as a third-order autocatalytic reaction.
    • Derivation of a model to predict sensor performance based on kinetic data.
    • Experimental validation of the sensor's performance under isothermal curing conditions.

    Main Results:

    • The derived model accurately describes the epoxy cure sensor's performance.
    • The sensor signal effectively predicts the gel point during isothermal composite curing.
    • The sensor demonstrates reliable performance in nonstoichiometric epoxy matrices.
    • The sensor can detect the end of the cure process without requiring calibration.

    Conclusions:

    • The fiber-optic epoxy cure sensor is a viable tool for real-time monitoring of composite curing.
    • The sensor's performance is directly linked to the optical properties and reaction kinetics of the epoxy system.
    • The developed sensor offers a calibration-free method for determining cure completion and monitoring the curing process.