Deterioration of concrete structures by acid deposition - An assessment of the role of rainwater on deterioration by laboratory and field exposure experiments using mortar specimens

Hiroshi Okochi, Hideki Kameda, Shin Ichi Hasegawa, Nobuhiko Saito, Ken Kubota, Manabu Igawa

研究成果: Article査読

59 被引用数 (Scopus)

抄録

Deterioration of concrete structures caused by acid deposition was investigated by laboratory and field exposure of portland cement mortar specimens to acid deposition. Laboratory exposure experiment showed that the dissolved amount of calcium hydrates, which were the major components in mortar, increased with the increase in the acidity of simulated acid rain solution and the decrease in the flow rate. There was little difference in their amount among different temperature treatments after each exposure to the solution with the same acidity, namely left at room temperature, heated at 70°C, and cooled at -2°C. The neutralization progressed more deeply under the heated and cooled condition and was accelerated by even acid rain with pH 4.7 during a long period (90 exposure cycles, which correspond to the rainfall amount of 15 years in Japan). A field exposure experiment for two years indicated that the carbonation of calcium hydrates and the formation of other corrosion products such as chloride, nitrate, and sulfate were limited to the surface of mortar specimens. The neutralization progressed more deeply in mortar specimens sheltered from rainwater than in those washed by rainwater. Copyright (C) 2000 Elsevier Science B.V.

本文言語English
ページ(範囲)2937-2945
ページ数9
ジャーナルAtmospheric Environment
34
18
DOI
出版ステータスPublished - 2000
外部発表はい

ASJC Scopus subject areas

  • 環境科学(全般)
  • 大気科学

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