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Author: search.filters.author.Limkatanyu, Suchart

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    Item type:Publication,
    Composite damage modeling of recycled aggregate concrete beam on Winkler-Pasternak foundations: A multiphase mechanical approach
    (2025-01-01)
    Limkatanyu, Suchart
    ;
    Sae-Long, Worathep
    ;
    Damrongwiriyanupap, Nattapong
    ;
    Sukontasukkul, Piti
    ;
    Phoo-Ngernkham, Tanakorn
    This paper proposes a new recycled aggregate concrete (RAC) beam model on a foundation that incorporates damage. The damage models are derived based on composite damage mechanics, considering three phases: cement paste, recycled concrete aggregate (RCA), and nano inclusions. Three damage models are used to represent damage in the RAC beam: the Voigt parallel model, the Reuss serial model, and the generalized self-consistent model. The Voigt parallel model represents the upper bound responses, while the lower bound responses are represented by the Reuss serial model. The beam model is developed using the virtual displacement principle, with the kinematic assumption based on Euler-Bernoulli beam theory. The Winkler-Pasternak foundation model is employed to account for the interaction between the beam and foundation. Two numerical simulations were conducted to investigate the effects of damage and system parameters on static bending analysis. Both simulations reveal that damage parameters lead to a degradation of system stiffness, resulting in increased beam deflection. Conversely, the foundation parameters increase system stiffness, leading to a reduction in beam deflection.
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    Effect of graphene oxide on single fiber pullout behavior
    (2021-04-19)
    Chindaprasirt, Prinya
    ;
    Sukontasukkul, Piti
    ;
    Techaphatthanakon, Apisit
    ;
    Kongtun, Suriyawan
    ;
    Ruttanapun, Chesta
    The properties of fiber reinforced concrete (FRC) depends strongly on bond between fiber and cement matrix. Any change in matrix and fiber characteristics affects the bond behavior. In this study, the effect of graphene oxide on cement composite strength and bond behavior between fiber and cement matrix was investigated. The graphene oxide solution with concentration of 10 mg/ml was mixed with cement mortar at 0.05% by weight of cement. Four types of fibers viz., hooked end steel, double hooked end steel, polypropylene and glass fibers were tested by embedding in both plain cement mortar (M) and cement graphene mortar (GM). The single fiber pullout test was performed at the rates of 60 and 180 mm/min. Results were collected in form of failure mode, scanning electron microscope (SEM) images, bond-slip response, bond strength and energy absorption. SEM images showed that the failure modes depended on fiber type, matrix type and loading rate. The steel fibers showed almost no damage except for the change of hooked end shape at the fiber end. For polypropylene fiber, the fiber surface scraping was commonly observed while the debonding of coating material was observed for glass fiber. The bond strength was higher in GM mortar than that of M mortar and increased with the increase in loading rate. In the case of fiber type, steel fibers exhibited higher bond and energy absorption than both polypropylene and glass fibers.