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    Volume 48, Issue 6 (November 2020)

    Evaluation of the Effect of Exposure Duration and Fiber Content on the Mechanical Properties of Polypropylene Fiber-Reinforced UHPC Exposed to Sustained Elevated Temperature

    (Received 31 October 2018; accepted 8 February 2019)

    Published Online: 2019

    CODEN: JTEVAB

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    Abstract

    This article presents the results of an experimental study conducted to assess the effect of sustained elevated temperature on the mechanical properties of ultrahigh performance concrete (UHPC). UHPC mixtures were prepared with four different dosages of polypropylene (PP) fibers, and each mixture was exposed to a sustained pre-spalling elevated temperature of 300°C for five durations. The experimental data indicate that the used PP fibers were effective in providing sufficient strength and ductility to UHPC mixtures at room temperature. However, the PP fibers ceased to function as reinforcement in UHPC specimens that were exposed to the elevated temperature for 60 minutes. With an increase in the exposure period after melting of the fibers, the specimens exhibited a brittle mode of failure accompanied with an enhancement in the compressive strength and compressive modulus of toughness and a reduction in the modulus of elasticity and flexural strength. The significance of two variables (exposure duration and fiber content) was evaluated, and correlations between the mechanical properties and selected parameters were obtained by conducting a statistical analysis of the experimental data.

    Author Information:

    Rasul, Mehboob
    Civil and Environmental Engineering Department, King Fahd University of Petroleum and Minerals, Dhahran,

    Ahmad, Shamsad
    Civil and Environmental Engineering Department, King Fahd University of Petroleum and Minerals, Dhahran,

    Adekunle, Saheed Kolawole
    Civil and Environmental Engineering Department, King Fahd University of Petroleum and Minerals, Dhahran,

    Al-Dulaijan, Salah U.
    Civil and Environmental Engineering Department, King Fahd University of Petroleum and Minerals, Dhahran,

    Maslehuddin, Mohammed
    Center for Engineering Research, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran,

    Ali, Syed Imran
    Civil and Environmental Engineering Department, King Fahd University of Petroleum and Minerals, Dhahran,


    Stock #: JTE20180687

    ISSN:0090-3973

    DOI: 10.1520/JTE20180687

    Author
    Title Evaluation of the Effect of Exposure Duration and Fiber Content on the Mechanical Properties of Polypropylene Fiber-Reinforced UHPC Exposed to Sustained Elevated Temperature
    Symposium ,
    Committee C09