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

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)2937-2945
Number of pages9
JournalAtmospheric Environment
Volume34
Issue number18
DOIs
Publication statusPublished - 2000 Jan 1
Externally publishedYes

Keywords

  • Acid deposition
  • Calcium hydrate
  • Concrete
  • Corrosion products
  • Neutralization

ASJC Scopus subject areas

  • Environmental Science(all)
  • Atmospheric Science

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