LI Chunhe

写真a

Title

Associate Professor

Date of Birth

1975

Mail Address

E-mail address

Graduating School 【 display / non-display

  •  
    -
    1999.07

    Tsinghua University   Faculty of Engineering   Graduated

Graduate School 【 display / non-display

  •  
    -
    2002.02

    Seoul National University  Graduate School, Division of Engineering  Master's Course  Completed

  •  
    -
    2005.12

    The University of Tokyo  Graduate School, Division of Engineering  Doctor's Course  Completed

 

Papers 【 display / non-display

  • Flexural Crack Behaviors of Partially Prestressed Concrete Beams with Different Bond Performance

    Tsuji Y., Li C., Hashimoto C., Suhara K.

    Concrete Journal   53   542 - 550   2015

    Multiple Authorship

     View Summary

    This paper reports the experimental results obtained for the flexural crack behavior of partially prestressed concrete (PPC) beams manufactured with either the post-tensioning method or the pre-tensioning method. The beams were designed with various compressive strength of 100 N/mm2, 70 N/mm2, and 35 N/mm2. The bond performance between the concrete and the prestressing-steel strands or PC steel bars in post-tensioned PPC beams of various PC grout quality levels, including unbonded grout, and pre-tensioned PPC beams, was found to have a major influence on the flexural crack behavior of PPC beams. Further, with regard to the PPC beams that use high-strength concrete of 100 N/mm2 class, post-tensioned PPC beams filled with high-strength PC grout were found to exhibit more desirable flexural crack behavior than pre-tensioned PPC beams. This paper also touches upon the applicability of the flexural crack width calculation formulas given in the Standard Specifications for Concrete Structures of the Japan Society of Civil Engineers.

    DOI CiNii

  • Flexural Crack Behaviors of Partially Pre-stressed High Strength Concrete Beams

    Tsuji Y., Li C., Suhara K., Hashimoto C.

    Concrete Journal   53   275 - 282   2015

    Multiple Authorship

     View Summary

    While the bending cracks properties of RC beams and PC beams have already been reported numerously in relation to the effective use of high-strength concrete, few studies have been conducted on the effect of increasing the strength of concrete on the bending cracks properties of PPC beams. This paper reports the experimental results obtained by a study examining primarily the bending crack width of PPC beams using high-strength concrete through comparison with PPC beams using ordinary concrete, with the amount of tension reinforcement and the quality of the PC grout as the main factors. Among the main findings are the fact that even when high strength concrete is used, the effect of PC grout strength is small, the fact that a bending crack dispersion effect was not necessarily obtained in PPC beams with small tensile reinforcement ratio, and the fact that although bending crack width could be reduced in PPC beams with small tensile reinforcement ratio, almost no such reduction could be achieved in PPC beams with large tensile reinforcement ratio.

    DOI CiNii

  • PERFORMANCE EVALUATION OF MORTAR USING COMPOSITE RECYCLED MATERIALS

    LI Chun-He, KAMEI Takeshi, NAGANO Teruki

    Cement Science and Concrete Technology   69   228 - 234   2015

    Multiple Authorship

     View Summary

    The growth of waste and recycled materials in Japan is one of the largest challenges nowadays. It has many economic and environmental benefits for our society. This paper investigates the development of high performance concrete, based on the formation of ettringite, using waste and recycled materials. For this purpose, wants to replace the fine aggregate of part with waste and recycled materials. Cement mixed with ground granulated blast-furnace slag, fly ash, gypsum wastes in varying proportions to obtain the optimal production for ettringite based on their chemical response. Compressive and flexure strength tests are performed on the different admixtures to measure the compressive and flexure strength. Measurement for length change of mortar tests are performed on the different admixtures to measure the length change and drying shrinkage. Scan electron microscope(SEM)are conducted on the samples to explore the formation and intensity of ettringite. The test results show that the admixture of using waste and recycled materials has a significant effect on the strength, length change and drying shrinkage improvement of mortar.

    DOI CiNii

  • 1333 Experimental Study on the Cracking Control Effect by the Alkali Resistant Glass Fiber Net

    KWAK Doyeon, TAKESHITA Eizo, LI Chunhe

    Summaries of technical papers of annual meeting   2013   665 - 666   2013.08

    Multiple Authorship

    CiNii

  • BEHAVIORS OF LATTICE-FORM CFRP JOINTED UNDER PORTION OF STRENGTHENED RC BEAMS LOADED WITH DIFFERENT CONDITIONS

    OKAMURA Yuki, LI Chun-He, TSUJI Yukikazu, YAMANAKA Tatsunori

    Cement Science and Concrete Technology   67   529 - 536   2013

    Multiple Authorship

     View Summary

    A depth thickening method of under portion of RC road bridge slabs is a promising practical one to increase mechanical behaviors of the damaged slabs. This method is consisted of attaching the lattice-form CFRP with joints and shotcreting of the polymer cement mortar. Some joints of CFRP cannot be available because of the lattice-form CFRP having a limited length. The strengthening effect of damaged RC beams is decreased by the joint of CFRP and is dependent upon loading condition. In this paper strengthening mechanisms of jointed portion under different loading condition are proposed by experiments of changing 3 type ratios of bending moment to shearing force from view points of capacity, type of failure, strains at reinforcing steel bar and CFRP, and cracks of the beam. It is also clear from the experimental results that the use of the lattice-form CFRP for strengthening of RC road bridge slabs is very effective especially when using a professional system in applying the good polymer cement mortar to increase the bond strength between old concrete and polymer cement mortar.

    DOI CiNii

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