It has been reported that concrete containing alginine, a kind of amino acid, could promote the growth of microalga on concrete surface during the setting in marine environment, which would improve the habitat for fishes in the sea. On the other hand, if the alginine mixed concrete is applied to a reinforced concrete structure in the marine environment, high durability against the chloride induced corrosion should be assured. Such a data relating durability of alginine mixed concrete hasn’t been investigated so far. Considering this background, in this study, salt water spraying test and marine exposure test using reinforced concrete specimens containing alginine were conducted to investigate the resistance performance of concrete containing alginine against chloride induced corrosion. Moreover, pore solution of mortar specimens was extracted by the high compressive pressure for the chemical analysis to measure the concentration of several ions. As a result, Cl⁻/OH⁻ molar ratio in pore solution was decreased and a steel corrosion in concrete monitored by electrochemical indexes was suppressed with the addition of alginine. Furthermore, alginine contained in pore solution changed to other kinds of amino acid, ornithine or citrulline, especially in the case of mortar using normal cement compared with the case using blast furnace slag cement.アミノ酸の一種であるアルギニンを混入したコンクリートは、海洋環境においてコンクリート表面への藻類の付着が促進され、魚類等の生物生息環境が改善できることが報告されている。本研究では海洋コンクリート構造物への適用を想定し、アルギニン混入コンクリートを用いた鉄筋コンクリートの塩害抵抗性を検討するため、塩水噴霧試験、海洋暴露実験とモルタル細孔溶液の化学分析を実施した。この結果、アルギニンを添加することによってモルタル細孔溶液中のCl⁻/OH⁻モル比が減少し、コンクリート中の鉄筋腐食が抑制される傾向を示した。


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  • Accession Number: 01564524
  • Record Type: Publication
  • Source Agency: Japan Science and Technology Agency (JST)
  • Files: TRIS, JSTAGE
  • Created Date: Apr 23 2015 10:57AM