Researcher Database

KAWAAI, Keiyu

FacultyGraduate School of Science and Engineering Civil and Environmental Engineering
PositionSenior Assistant Professor
Last Updated :2019/08/19

Researcher Profile and Settings

Profile and Settings

Name

  • Name

    KAWAAI, Keiyu

Profile & Settings

  • アバター画像URI

    https://researchmap.jp/?action=common_download_user&upload_id=138618

Education, Etc.

Education

  • 2009/08 - 2013/09
  • 2004/04 - 2006/03
  • 2000/04 - 2004/03

Degree

  • PhD

その他基本情報

Association Memberships

  • RILEM
  • THE SOCIETY OF MATERIALS SCIENCE, JAPAN
  • JAPAN SOCIETY OF CIVIL ENGINEERS
  • JAPAN CONCRETE INSTITUTE

Committee Memberships

  • 2018/04 - Today
  • 2017/10 - Today
  • 2017/07 - Today
  • 2016/12 - Today
  • 2016/04 - 2018/04
  • 2016/04 - 2018/04
  • 2015/04 - 2017/03
  • 2014/04 - 2016/03
  • 2013/11 - 2015/03

Academic & Professional Experience

  • 2019/04 - Today
  • 2016/10 - 2019/03
  • 2016/10 - Today
  • 2015/06 - 2015/12
  • 2013/10 - 2016/09
  • 2013/07 - 2013/09
  • 2006/04 - 2009/07

Research Activities

Research Areas, Etc.

Research Areas

  • Civil engineering, Civil engineering materials/Construction/Construction management

Book, papers, etc

Published Papers

  • CORROSION RESISTANCE OF STEEL BARS IN MORTAR MIXTURES MIXED WITH ORGANIC MATTER, MICROBIAL OR OTHER (accepted), K. Kawaai, T. Nishida, A. Saito, I. Ujike and S. Fujioka, Cement and Concrete Research, 2019, [Refereed]
  • Effects of bleeding on corrosion of horizontal steel bars in reinforced concrete column specimen, International Journal of Technology, 2019, [Refereed]
  • 2019/07, [Refereed]
  • Corrosion Current Density of Macrocell of Horizontal Steel Bars in Reinforced Concrete Column Specimen, N. Sandra, K. Kawaai and I. Ujike, International Journal of Geomate, 2019, [Refereed]
  • Application of bio-based material for concrete repair: case study leakage on parallel concrete slab, Prima Yane Putri, Isao Ujike, Keiyu Kawaai, MATEC Web of Conferences 258:01013, 2019/01, [Refereed]
  • CORROSION PROPERTIES OF HORIZONTAL STEEL BARS IN CONCRETE COLUMN SPECIMENS CAST WITH COPPER SLAG FINE AGGREGATE, N. Sandra, K. Kawaai and I. Ujike, 4th International Conference on Service Life Design for Infrastructures, 2018/08, [Refereed]
  • Influence of bleeding on modification of pore structure and carbonation-induced corrosion formation, Willick Nsama, Isao Ujike, Keiyu Kawaai, Yuto Kubo and Nevy Sandra, 4th International Conference on Service Life Design for Infrastructures, 2018/08, [Refereed]
  • APPLICABILITY OF BIO-BASED MATERIALS TO REPAIR WATER LEAKAGE OF CONCRETE, Prima Yane PUTRI, Isao UJIKE, Keiyu KAWAAI, 40th Japan Concrete Institute Annual Convention, 2018/07, [Refereed]
  • CATHODIC POLARIZATION PROPERTIES OF STEEL BARS IN CONCRETE MIXED WITH AEROBIC MICROORGANISM, K. Kawaai, I. Ujike, S. Fujioka, T. Nishida and A. Saito, Final Conference of RILEM TC 253-MCI, 2018/06, [Refereed]
  • Abundance and size of microplastics in a coastal sea: Comparison among bottom sediment, beach sediment, and surface water, N. Sagawa, K. Kawaai and H. Hinata, Marine Pollution Bulletin, 2018, [Refereed]
  • Restrained early age shrinkage at the vertical interface between fresh cementitious mixtures and hardened substrates Part-II, K. Kawaai and O.K.C. Gary, International Journal of Engineering Research and Applications, 2018, [Refereed]
  • Restrained early age shrinkage at the vertical interface between fresh cementitious mixtures and hardened substrates Part-I, K.Kawaai and O.K.C. Gary, International Journal of Engineering Research and Applications, 2018, [Refereed]
  • 2017/10, [Refereed]
  • 2017, [Refereed]
  • INFLUENCE OF BLEEDING ON VARIATIONS OF PERMEABILITY IN CONCRETE COLUMN SPECIMENS, KAWAAI Keiyu, 2017/08, [Refereed]
  • 2017/08, [Refereed], 10.2472/jsms.66.601
  • 2017/08, [Refereed], 10.2472/jsms.66.615
  • 2017/08, [Refereed], 10.2472/jsms.66.608
  • 2017/07, [Refereed]
  • 2017/07, [Refereed]
  • 2017/07, [Refereed], 10.2473/journalofmmij.133.132
  • Influence of the type of dry yeast on precipitation rate of calcium carbonate in bio-based repair materials, ICBBM ECOGRAFI 2017, 2017/06, [Refereed]
  • Alginate capsules encapsulating aerobic and anaerobic microorganism for repairing cracks in concrete, 6th International Conference on Self-Healing Materials, 2017/06, [Refereed]
  • Enhancement of corrosion resistance in mortar using aerobic bacillus subtilis, K. Kawaai, I. Ujike, and P.Y. Putri, HealCon, 2016/11, [Refereed]
  • 2016/10, [Refereed]
  • 2016/10
  • A study on the factors affecting electro-migration characteristic of chloride ion in concrete, ASEA SEC 3rd International Conference, 2016/09, [Refereed]
  • Effect of Temperature on Precipitation Rate of Calcium Carbonate Produced Through Microbial Metabolic Process of Bio Materials, Prima, Y. P., Kawaai, K., Ujike, I., Journal of Civil Engineering Science and Application, 2016, [Refereed]
  • Influence of Bleeding on Durability of Horizontal Steel Bars in RC Column Specimen, K. Kawaai and I. Ujike, Fifth International Symposium on Life-Cycle Civil Engineering, 2016/10, [Refereed]
  • 2016/07, [Refereed]
  • 2016/07, [Refereed]
  • Some considerations on precipitation rate of calcium carbonate in bio-based materials used for concrete repair, K. Kawaai, I. Ujike, S. Yamamoto and P.Y. Putri, Concrete Solutions 2016, 6th International Conference on Concrete Repair, 2016/06, [Refereed]
  • A Novel Method in Enhancing Corrosion Resistance in Concrete Using Aerobic Bacillus Subtilis, K. Kawaai, T. Nishida, A. Saito, and I. Ujike, International Symposium on Concrete and Structures for Next Generation: Ikeda & Otsuki Symposium (IOS 2016), 2016/05, [Refereed]
  • Effects of Internal Cracking and Drying Shrinkage on Corrosion Processes of RC Beam Specimen, K. Kawaai, I. Ujike, and I. Nakai, CONCREEP 10, doi: 10.1061/9780784479346.057, 2015/09, [Refereed], 10.1061/9780784479346.057
  • ESTIMATION METHOD FOR DURABILITY PERFORMANCES IN COVER CONCRETE BY IN-SITU AIR PERMEABILITY TESTS, K. Kawaai and I. Ujike, The Fifth International Conference on Construction Materials: Performance, Innovations and Structural Implications, 2015/08, [Refereed]
  • CARBONATION AT VERTICAL INTERFACES FORMED BETWEEN FRESHLY CAST CEMENTITIOUS MIXTURES AND HARDENED CONCRETE SUBSTRATES, K. Kawaai, A. Annapareddy, K.C.G. Ong, and C.T. Tam, 40th Conference on Our World Concrete & Structures, 2015/08, [Refereed]
  • 銅スラグ細骨材とフライアッシュを使用した乾燥収縮ひび割れ抑制コンクリートの開発, 仲井一平, 高本直樹, 河合慶有, 氏家勲, コンクリート工学年次論文集(CD-ROM), 2015/06, [Refereed], 1347-4111
  • 炭酸カルシウムの析出速度及び析出量に及ぼす諸要因に関する研究, 山本沙也, 久保郁貴, 河合慶有, 氏家勲, コンクリート工学年次論文集(CD-ROM), 2015/06, [Refereed], 1347-4111
  • 乾湿繰り返し作用を受けるフライアッシュコンクリートの鉄筋腐食性状に及ぼす初期養生および水結合材比の影響, 門屋朱里, 春日翔平, 河合慶有, 氏家勲, コンクリート工学年次論文集(CD-ROM), 2015/06, [Refereed], 1347-4111
  • SHORT-TERM AND LONG-TERM SOLUTIONS USING FLY ASH FOR SUSTAINABLE DEVELOPMENT IN CONCRETE CONSTRUCTION INDUSTRY, K. Kawaai, I. Ujike, S. Kasuga, and H. Miyake, Proceedings of Workshop on Utilization of Waste Materials, Manila, 2014/08, [Refereed]
  • 2014/07, [Refereed]
  • 2014/07, [Refereed]
  • Effect of curing condition on air permeability coefficient measured by in-situ test method, K. Kawaai, I. Ujike, S. Kunikata, and S. Okazaki, Life-Cycle of Structural Systems Design, Assessment, Maintenance and Management, CRC press, 2014/10, [Refereed]
  • Influencing factors affecting microbial metabolic processes of bio materials used for leaking repairs, I. Ujike, F. Kubo, K. Kawaai, and S. Okazaki, Concrete Solutions, Taylor & Francis Group, London, ISBN 978-1-138-02708-4, 2014, [Refereed]
  • DURABILITY DESIGN OF TYPICAL DFD (DESIGN FOR DISASSEMBLY) COMPONENTS FOR A TROPICAL ENVIRONMENT, KEIYU KAWAAI , National University of Singapore, 2013/09, [Refereed]
  • SIZE-EFFECT OF EARLY AGE SHRINKAGE AT THE INTERFACE BETWEEN FRESH CEMENTITIOUS MIXTURES AND HARDENED CONCRETE SUBSTRATE, K.C.G. Ong, K. Kawaai, C.T. Tam and Sze-Dai Pang, 37rd Our World in Concrete and Structures, 2013/08, [Refereed]
  • 2008/08, [Refereed]
  • 2006/08, [Refereed]
  • 2004

Books etc

  • 2018/10

Conference Activities & Talks

  • 2018/07, 招待有り
  • 2017/07, 招待有り
  • 2017/05
  • 2017/05
  • 2016/10, 招待有り
  • 2016/06, 招待有り
  • 2016/05
  • 2016/05
  • 2016/05
  • 2016/05
  • 2016/05
  • 2016/05
  • 2015/05
  • 2015/05
  • 2015/05
  • 2015/05
  • 2015/05
  • 2015/05
  • 2015/05
  • 2015/05
  • コンクリートの初期養生及び材齢が電気泳動試験に及ぼす影響, 河合慶有, 氏家勲, 國方翔太, 土木学会年次学術講演会講演概要集(CD-ROM), 2014/08
  • 2014/05
  • 2014/05
  • 2014/05
  • 2014/05
  • 2014/05
  • 電着工法におけるひび割れ深部での電着物析出阻害の機構解明およびその改善, 鈴木一平, 大即信明, 西田孝弘, 河合慶有, セメント技術大会講演要旨, 2006/05
  • 鉄筋コンクリートに対する適切な電気防食回路の設計に関する基礎的研究, 河合慶有, 大即信明, 西田孝弘, 鄭仁沢, セメント技術大会講演要旨, 2004/04

Misc

  • Electrical Resistance Tomography for Assessing Water Movement in Cracked Cementitious Mixtures, Keiyu Kawaai, Isao Ujike, MATEC Web of Conferences, 199, 2018/10, 10.1051/matecconf/201819911016, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85056623881&origin=inward, © 2018 The Authors, published by EDP Sciences. Electrical resistance tomography (ERT) has been studied for visualizing variations of conductivity in concrete specimens. In recent years, unsaturated water flow through pores formed in concrete has been intensively examined though ERT systems to visualize the permeation front that gradually changes with elapsed time. This study examines water movement through internal cracks which are typically not observed on the surface of mortar or concrete specimens via ERT systems. The results indicate the gradual increase of saturated region owing to the ingress of water through cracked surface up to 120 hours. And, the region with higher conductivity estimated in uncracked parts is evidently in good agreement with higher moisture content measured by moisture meter on the split surface. In addition, the presence of crack in concrete specimen subjected to water ingress is clearly visualized via ERT images owing to rapid water movement in cracked zones. This study has provided the important insight that the ingress and the movement of water through pores and cracks formed in cementitious mixtures could be assessed via electrical measurements.
  • Influence of different concentration of tris buffer solution on calcium carbonate precipitation in bio-based repair materials, Prima Yane Putri, Keiyu Kawaai, Isao Ujike, Hiroshi Okuno, International Journal on Advanced Science, Engineering and Information Technology, 7, 1879, 1885, 2017/01, 20885334, 10.18517/ijaseit.7.5.3452, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85032692032&origin=inward, This research examined differences in the concentration of Tris buffer solution on calcium carbonate precipitation in biobased repair materials. Four concentrations of Tris buffer solution were chosen based on previous research with initial pH 8.0 and 9.0. Initial experiments demonstrated that the concentration and pH of Tris buffer solution had an influence on the amount of precipitation of calcium carbonate. X-Ray Diffraction (XRD) analysis elucidated the morphological and structural differences of the calcium carbonate crystal, including calcite and vaterite. They are the prominent forms of CaCO3 detected based on results obtained by according to FT-IR analysis. The result further explains the effectiveness of Tris buffer concentration.

Other Research Activities

Patents

  • 特願2016-087837, 特開2017-197393

Awards & Honors

  • 2018/03
  • 2013/11
  • 2009/08

愛媛大学教員活動実績

教育活動(B)

論文指導(B07)

  • 2017, 4, 3, 1, 2


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