Faculty Profiles - YAMAGUCHI Toshinobu

Papers - YAMAGUCHI Toshinobu

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武若耕司、山口明伸、審良善和 . 溶融亜鉛めっき鉄筋を使用したコンクリート構造物の寿命予測手法及び点検診断手法の確立に向けた基礎的研究 . JGA news81 34 - 39 2020.1Invited

川畑雅樹、濵田泰行、審良善和、武若耕司、山口明伸、小池賢太郎 . RC構造物に適用される電気防食工法における適切な電位モニタリング位置について . 防錆管理 2020.1Reviewed

山本貴士、山口明伸、審良善和、中村英佑 . 溶融亜鉛めっき鉄筋を用いた実構造物の調査に基づく耐久性評価 . JGA news81 44 - 49 2020.1

Horiguchi Kenichi, Yamaguchi Toshinobu, Maruya Tsuyoshi, Takewaka Koji . Study on the Method of Measuring the Chloride Threshold Value of Corrosion and Estimation of the Values in Durability Design of Concrete Structures . Journal of Advanced Concrete Technology18 ( 10 ) 571 - 587 2020

Publisher：公益社団法人日本コンクリート工学会

In this study, a method was developed to estimate accurately the chloride threshold value for corrosion initiation in reinforced concrete. In this method, chlorides are supplied through a part of the specimen surface, and half-cell potential between the rebar and reference electrode embedded in a concrete specimen was measured in every ten minutes. A sudden drop of half-cell potential was observed as the continuation of the measurement. At that time, the specimen was broken and corrosion of rebar on its narrow surface was confirmed. The chloride threshold value can be estimated by determining the chloride concentration at the time of the potential drop. The estimated chloride threshold values for normal Portland cement concrete with cement content between 254 and 446 kg/m3 are in the range of 1.6 to 3.6 kg/m3. This paper is an English translation from the authors' previous work [Horiguchi, K., Yamaguchi, T., Maruya, T. and Takewaka, K., (2015). "A study on the method of measuring the chloride threshold value of corrosion and on the estimation of the values." Journal of JSCE, Ser. E2, 71(2), 107-123. (in Japanese)].

DOI： 10.3151/jact.18.571

Scopus

CiNii Research

Yasuyuki Hamada, Masaki Kawabata, Yoshikazu Akira, Koji Takewaka, Toshinobu Yamaguchi, Kentaro Koike . Influence of monitoring position for cathodic protection on corrosion protection performance of rebar in RC structures . NACE International East Asia and Pacific Area Conference 2019 2019.11Reviewed

Hiromi Yamazumi, Koji Takewaka, Toshinobu Yamaguchi, Yoshikazu Akira . Study on durability of the RC Structure Using Galvanized Steel Bars in Chloride induced Deterioration Environment . NACE International East Asia and Pacific Area Conference 2019 2019.11Reviewed

富山潤、有澤希、須田裕哉、山口明伸、加藤佳孝 . コンクリート橋上部工の部位・部材毎の塩害劣化予測シミュレーション . コンクリート構造物の補修、補強、アップグレード論文報告集19 617 - 622 2019.10Reviewed

Kazuya Sakamoto, Yoshikazu Akira, Koji Takewaka, Toshinobu Yamaguchi . Fatigue Resistance of Connection of Precast Concrete Segments Using Epoxy Resin and Anchor Combination . The 3rd Asian concrete Federation (ACF) Symposium2019 S2-3 - 5 2019.9Reviewed

Kazuya Sakamoto, Yoshikazu Akira, Koji Takewaka, Toshinobu Yamaguchi . Structural Stability and Fatigue Resistance of Precast Concrete Barriers Installed Using Anchors and Epoxy Resin . Bridge Engineering Institute Conference (BEI-2019) 667 - 671 2019.7Reviewed

栗野広大、審良善和、武若耕司、山口明伸、伊川辰茂、安江省吾 . 磁気吸着機構を利用したAI合金陽極の設置が電気防食効果に及ぼす影響 . 防錆管理63 ( 3 ) 95 - 99 2019.3Reviewed

武若耕司、濵田秀則、佐藤靖彦、宮里心一、山口明伸、山本貴士、審良善和　他 . 亜鉛めっき鉄筋を用いるコンクリート構造物の設計・施工指針（案） . 土木学会 2019.3

Takewaka K., Hamada H., Yamaguchi T., Akira Y. . Outline of Japan Society of Civil Engineers (JSCE) Guideline on Design and Application Methods of Galvanized Steel Reinforcement for Concrete Structures . Concrete Journal57 ( 12 ) 903 - 908 2019

Publisher：Japan Concrete Institute

In March 2019, the Concrete Committee of the Japan Society of Civil Engineers published a revised version of "Guideline on Design and Application Methods of Galvanized Steel Reinforcement for Concrete Structures". This latest version updates the previous guideline published in 1980, while introducing the concept of performance design to allow durability design of concrete structures using galvanized steel reinforcement. This paper introduces the content of the main parts of the revised guideline.

DOI： 10.3151/coj.57.12_903

CiNii Research

堀江亮介、福永隆之、山口明伸、武若耕司、審良善和、小池賢太郎 . 木質系バイオマスボイラー燃焼灰の有効活用に関する基礎的検討 . 九州橋梁・構造工学研究会シンポジウム論文集6 R23 2018.12

K. Koike, T. Yamaguchi, K. Takewaka, Y, Akira . Analytical Evaluation of Chloride Ion Penetration with Effect of Capillary Water Movement in Concrete . Sustainability and Innovation in Concrete Materials and Structures1 569 - 578 2018.11Reviewed

審良善和、武若耕司、山口明伸 . コンクリート中亜鉛めっき鉄筋の腐食速度評価 . セメント・コンクリート研究討論会論文報告集45 2018.11

山口明伸, 中野智章, 富山潤, 小池賢太郎, 審良善和 . 塩害環境下の飛来塩分量に対するミクロ的環境条件の影響 . セメント・コンクリート研究討論会論文報告集45 2018.11

Y. Hamada, Y. Akira, K. Takewaka, T. Yamaguchi, K. Koike, and T. Yamaji . Corrosion Characteristics of Underground Rc Structures Constructed in Coastal Area . Sustainability and Innovation in Concrete Materials and Structures1 781 - 788 2018.11Reviewed

馬場崇吉郎、武若耕司、山口明伸、審良善和、小池賢太郎、岩井迫蘭 . 海洋環境下において長期暴露したRC柱の塩害抵抗性評価 . 「自然環境下のコンクリート劣化」に関するシンポジウム 249 - 254 2018.9

辻田美帆、審良善和、武若耕司、山口明伸 . コンクリート中鉄筋の分極特性を考慮した電気防食設計に関する一考察 . 電気化学的手法を活用した実効的維持管理手法の確立に関する研究委員会　シンポジウム論文集 316 - 321 2018.9

山本誠、武若耕司、山口明伸、審良善和 . 鉄筋コンクリート構造物における外部電源方式電気防食工法の防食管理方法に関する検討 . 土木学会論文集E2（材料・コンクリート構造）74 ( 3 ) 192 - 206 2018.8Reviewed

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Papers - YAMAGUCHI Toshinobu