Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) 荒木 秀夫 and 根口 百世 and 南 宏一,Possibility of Retrofit of Existing Reinforced Concrete Buildings with Low Strength Concrete,Concrete Journal,03871061,Japan Concrete Institute,2010,48,7,7_3-7_8,https://cir.nii.ac.jp/crid/1390001204541715072,https://doi.org/10.3151/coj.48.7_3