Evaluation of Fiber Dispersion and Bridging Strength Variation in DFRCC

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  • Watanabe Keisuke
    筑波大学大学院 システム情報工学研究科構造エネルギー工学専攻
  • Ozu Yuriko
    筑波大学大学院 システム情報工学研究科構造エネルギー工学専攻
  • Kanakubo Toshiyuki
    筑波大学 システム情報系構造エネルギー工学域

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  • DFRCCにおける繊維の分散性評価と架橋強度のばらつきの検討

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Abstract

<p>Ductile Fiber-Reinforced Cementitious Composites (DFRCC) are cementitious materials mixed with short fibers. It is well known that tensile and bending characteristics of DFRCC are affected by fiber orientation and dispersion. In this study, the relationships between tensile stress and crack width (bridging law) are evaluated considering fiber dispersion in order to investigate the variation in tensile characteristic of DFRCC. The fiber dispersion is evaluated by Poisson distribution from the results of visualization simulations using sodium silicate solution (water grass) and introduced in the calculation of the bridging law. The variation of maximum tensile stress (bridging strength) can be confirmed by Monte Carlo simulation, in which the fiber dispersion following Poisson distribution is considered. The calculated bridging law is modeled by trilinear model, and section analysis is conducted to compare with test results. The possibility to assume the variation of bending strength can be found out by considering fiber dispersion.</p>

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