Kneaded material for cement composite material excellent in shear break resistance, composite material, and bridge beam member

Tetsushi Kanda (Inventor), Noboru Sakata (Inventor), Daisuke Hayashi (Inventor), Yuji Uchida (Inventor), Benny Suryanto (Inventor), Kohei Nagai (Inventor), Koichi Maekawa (Inventor)

    Research output: Patent

    Abstract

    To provide a cement reinforced with short fibers, which is improved in shear break resistance while taking advantage of excellent deformation ability of ECC.

    A cement composition X containing 1.0-3.0 vol.% of PVA short fibers having a fiber diameter of 30-50 µm, and a fiber length of 5-20 mm, and having properties described in the following [A] wherein the water-cement ratio is not less than 30% and the sand-cement ratio is 0-100% is mixed with a coarse aggregate Y to make a kneaded material having a content of the coarse aggregate Y of 5-15 vol.% in the whole kneaded material. The kneaded material is placed as a cement composite material. [A] A hardened body of a kneaded material obtained by kneading the cement composition X (not containing the coarse aggregate Y) to disperse the PVA short fibers randomly in the three-dimensional direction behaves to show not less than 1% of a tensile strain in the tensile test, the hardened body having a material age of 28 days by standard under water curing.
    Original languageEnglish
    Patent numberJP2011121832 (A)
    IPCC04B28/02; C04B16/06; E01D1/00
    Publication statusPublished - 23 Jun 2011

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