Chloride diffusion, microstructure, and mineralogy of concrete after 15 years of exposure in tidal environment

Tarek Uddin Mohammed, Toru Yamaji, Hidenori Hamada

研究成果: ジャーナルへの寄稿記事

39 引用 (Scopus)

抄録

A detailed investigation on the chloride diffusion, microstructure, and mineralogy of 15-year-old concrete specimens 150 mm in diameter and 300 mm in height was carried out. The specimens were exposed to a tidal environment. The cement types were ordinary portland cement (OPC), slag cements of Types A, B, and C (SCA, SCB, and SCC), and Type B fly ash cement (FACB). The water-cement ratio (w/c) was 0.45. Compressive strength, carbonation depths, pulse velocity, water- and acid-soluble chloride profiles, microstructure, and mineralogy of concrete were evaluated. Chloride diffusion as well as chloride binding ability of concrete with the variation of cement types is sequenced as OPC>FACB>SCA>SCB>SCC. Improvement of the microstructure of concrete at the outer region of the specimens due to the reaction between seawater and hydration products is clearly observed. It blocks chlorides at the outer regions and chloride profiles drop to a negligible value very sharply at a short distance inside concrete, especially for SCC and SCB. Friedel's salt is observed, irrespective of the cement types; however, it is limited to the outer region for slag cement. Magnesium hydroxide is observed at the outer regions for OPC and FACB only. Ettringite is formed at the outer regions, irrespective of the cement types; however, for FACB, it infiltrates to a depth more than 45 mm from the surface.

元の言語英語
ページ(範囲)256-263
ページ数8
ジャーナルACI Materials Journal
99
発行部数3
出版物ステータス出版済み - 5 2002
外部発表Yes

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Mineralogy
Chlorides
Cements
Concretes
Microstructure
Portland cement
Slag cement
Magnesium Hydroxide
Coal Ash
Carbonation
Water
Fly ash
Seawater
Hydration
Compressive strength
Magnesium
Salts
Acids

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

これを引用

Chloride diffusion, microstructure, and mineralogy of concrete after 15 years of exposure in tidal environment. / Mohammed, Tarek Uddin; Yamaji, Toru; Hamada, Hidenori.

:: ACI Materials Journal, 巻 99, 番号 3, 05.2002, p. 256-263.

研究成果: ジャーナルへの寄稿記事

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