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A Study on the Physical and Chemical Deterioration of Hardened Mortar due to Leaching Calcium

Research Project

Project/Area Number 12450177
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 土木材料・力学一般
Research InstitutionIndependent Administration Institution, Public Works Research Institute (2002)
Niigata University (2000-2001)

Principal Investigator

HISADA Makoto  Public Works Research Institute, Structural Management Technology Research Team, Senior Researcher, 技術推進本部, 主任研究員 (80238295)

Co-Investigator(Kenkyū-buntansha) SAEKI Tatsuhiko  Niigata University, Dept.of Civil Eng and Architecture, Associate professor, 工学部, 助教授 (90215575)
Project Period (FY) 2000 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥8,400,000 (Direct Cost: ¥8,400,000)
Fiscal Year 2002: ¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 2001: ¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 2000: ¥3,700,000 (Direct Cost: ¥3,700,000)
Keywordsleaching calcium / Ca(OH)_2 / CSH / AFm / modified acid rain / pH / pH / カルシウム / 溶出(リーチング) / コンクリート構造物 / セメント水和物 / 炭酸化 / 濃縮
Research Abstract

The purpose of this study is to determine the change of concrete quality by leaching Ca^<2+> from concrete. In this investigation, the electrical leaching tests were mainly carried out by using hardened mortar, and these tests were set up as Ca^<2+> was electrically dissolved out from specimens. And the physical and chemical changes of hardened mortar due to the leaching Ca^<2+> were measured in this study. From these test results, the mechanisms of leaching Ca^<2+> from mortar were experimentally found out.
According to the relation between the amount of Ca(OH)_2 and that of CSH, it can be recognized that leaching out of Ca(OH)_2 and CSH are related in all cement mixtures, durations and depth. Moreover, the remaining CSH can be estimated at most 0.3 g/cm^3 when Ca(OH)_2 was completely leached out from the mortar specimens.
In dissolving process, it is general that the dissolubility of solid can be evaluated basically by the solubility and surface area of the solid. From these viewpoints, the authors can conclude that CSH in concrete can be dissolved at early stage of service time because of its large surface area, although the solubility of CSH is comparatively smaller than that of Ca(OH)_2.

Report

(4 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • 2000 Annual Research Report
  • Research Products

    (22 results)

All Other

All Publications (22 results)

  • [Publications] M.HISADA, T.SAEKI, S.NAGATAKI: "A Study on the Ion Diffusivity and Degradation of Cement Mortar due to Chemical Attack"Proceedings of the 1st fib congress. W-167. (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 久田 真, 大井才生, 尾口本一: "カルシウム成分の溶脱現象における細孔溶液の役割"コンクリート工学年次論文集. 24・1. 495-500 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 横関康祐, 渡邊賢三, 古沢靖彦, 大門正機, 大即信明, 久田 真: "カルシウムイオンの溶出に伴うコンクリートの変質に関する実態調査と解析的評価"土木学会論文集. 697・54. 85-96 (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 久田 真, 松谷竜一, 酒井宗義: "化学的浸食作用によるセメント硬化体中の水和物量変化"土木学会コンクリート耐久性データベースフォーマットに関するシンポジウム論文集. 51-56 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 酒井宗義, 久田 真, 松谷竜一: "酸性雨成分によるセメント硬化体の溶脱挙動の変化に関する研究"土木学会第57回年次学術講演会講演概要集. V・572. 1143-1144 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Makoto HISADA, Kazuyoshi SAKAI, Shigeyoshi NAGATAKI: "A Study on the Difference of Chloride Ion Diffusivity and Degradation of Cement Mortar due to NaCl and CaCl_2 Ingress"Third International RILEM Workshop on Testing and Modeling Chloride Ingress into Concrete, 2002. (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Makoto HISADA, Tatsuhiko SAEKI, Shigeyoshi NAGATAKI: "A Study on the Ion Diffusivity and Degradation of Cement Mortar due to Chemical Attack"Proc.of the 1st fib congress. W-167. (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Makoto HISADA, Motokazu OGUCHI, Toshio OOI, Shigeyoshi NAGATAKI: "The Physical and Chemical Deterioration of Hardened Mortar due to Leaching Calcium"Proceedings of the 2001 Second International Conference on Engineering Materials. 661-668 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Makoto HISADA, Motokazu OGUCHI, Toshio OOI, Shigeyoshi NAGATAKI: "The Influence of The Characteristics of Cement Hydration on Leaching Calcium from Hardened Mortar"fib-International Symposium on Concrete and Environment. 100-105 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Makoto HISADA, Toshio OOI, Shigeyoshi NAGATAKI, Nobuaki OTSUKI: "The Influence of materials and Mixture Proportions on the Leaching of Calcium Ions from Mortar"Fifth CANMET/ACI International Conference on Durability of Concrete, Supplementary Papers. 749-763 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M.HISADA, T.SAEKI, S.NAGATAKI: "A Study on the Ion Diffusivity and Degradation of Cement Mortar due to Chemical Attack"Proceedings of the 1st fib congress. W-167. (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 久田 真, 大井才生, 尾口本一: "カルシウム成分の溶脱現象における細孔溶液の役割"コンクリート工学年次論文集. 24・1. 495-500 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 横関康祐, 渡邊賢三, 古沢靖彦, 大門正機, 大即信明, 久田 真: "カルシウムイオンの溶出に伴うコンクリートの変質に関する実態調査と解析的評価"土木学会論文集. 697・54. 85-96 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 久田 真, 松谷竜, 酒井宗義: "化学的浸食作用によるセメント硬化体中の水和物量変化"土木学会 コンクリート耐久性データベースフォーマットに関するシンポジウム論文集. 51-56 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 酒井宗義, 久田 真, 松谷竜一: "酸性雨成分によるセメント硬化体の溶脱挙動の変化に関する研究"土木学会第57回年次学術講演会講演概要集. V・572. 1143-1144 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Hisada, M., Oguchi, M., Ooi, T., Nagataki, S.: "The Physical and Chemical Deterioration of Hardened Mortar due to Leaching Calcium"Proceedings of the 2001 Second International Conference on Engineering Materials. 1. 661-668 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 尾口本一, 大井才生, 久田真: "水和物組成の違いがCaの溶脱による硬化体物性の変化に及ぼす影響"コンクリート工学年次論文集. 1. 457-462 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 久田 真, 酒井 宗義, 尾口 本一: "セメント硬化体中における各種陰イオンの拡散性状"日本材料学会, 第1回コンクリート構造物の捕集, 補強, アップグレードシンポジウム論文集. 57-62 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 久田 真, 大井 才生: "長期間を経たコンクリート中のセメント水和物の溶脱に関する研究"日本材料学会第50期学術講演会講演論文集. 61-62 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 久田 真, 伊藤慎也: "塩化物イオンの拡散性状に及ぼすセメント硬化体の物性変化の影響"日本コンクリート工学協会, 複合劣化コンクリート構造物の評価と維持管理計画に関するシンポジウム論文集. 1-6 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 久田真,大井才生,尾口本一,長瀧重義: "モルタルからのカルシウムの溶出に伴なうセメント水和物の組成と硬化体物性の変化"コンクリート工学次論文報告集. 22・1. 223-228 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] M.Hisada,T.Ooi,S.Nagataki and N.Otsuki: "The Influence of materials and Mixture Proportions on the Leaching of Calcium Ions from Mortar"Fifth CANMET/ACI International Conference on Durability of Concrete. 749-763 (2000)

    • Related Report
      2000 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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