Influence of chemistry of chloride ions in cement matrix on corrosion of steel

Ha Won Song, Min Sun Jung, Chang Hong Lee, Sang Hyo Kim, Ki Yong Ann

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

To assess the resistance of steel against corrosion, mortar specimens were manufactured with a centrally located steel reinforcing bar. The mortars were formulated by combining ordinary portland cement (OPC) with a single supplementary cementitious material. The proportions were 30% pulverized fuel ash (PFA), 60% groundgranulated blast-furnace slag (GGBS), or 10% silica fume (SF) by weight. In addition, a pure OPC mortar was prepared. The mortar specimens contained chlorides from 0.0 to 3.0% by weight of binder to accelerate the corrosion process. Then, the corrosion rate was measured by a polarization technique to determine the chloride threshold level for corrosion in concrete. The buffering capacity of the cement matrix to a pH reduction was quantified by measuring the acid neutralization capacity. The suspension consisting of distilled water and paste powder was exposed to nitric acid to characterize a decrease in the pH. As a result, the chloride threshold level for corrosion was dependent on binders, with values of 0.74 to 0.93%, 0.48 to 0.59%, 0.29 to 0.44%, and 0.63 to 0.78% by weight of binder for OPC, 30% PFA, 60% GGBS, and 10% SF, respectively. It was found that an increase in the buffering capacity resulted in an increased threshold value, of which characteristics were used for a new representation of the chloride threshold. The threshold ratio of[Cl -]:[H+] for acidification to a pH value of 10 at corrosion accounted for 0.0063 and 0.0082, irrespective of binder type, at 1.0 and 2.0 mA/m2 (6.50 × 10-4 and 1.29 × 10-3 mA/in.2) of the corrosion rate, respectively.

Original languageEnglish
Pages (from-to)332-339
Number of pages8
JournalACI Materials Journal
Volume107
Issue number4
Publication statusPublished - 2010 Jul 1

Fingerprint

Steel
Ashes
Mortar
Binders
Chlorides
Cements
Portland cement
Ions
Corrosion
Pulverized fuel
Silica fume
Corrosion rate
Slags
Nitric Acid
Steel corrosion
Acidification
Nitric acid
Ointments
Powders
Suspensions

All Science Journal Classification (ASJC) codes

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

Cite this

Song, H. W., Jung, M. S., Lee, C. H., Kim, S. H., & Ann, K. Y. (2010). Influence of chemistry of chloride ions in cement matrix on corrosion of steel. ACI Materials Journal, 107(4), 332-339.
Song, Ha Won ; Jung, Min Sun ; Lee, Chang Hong ; Kim, Sang Hyo ; Ann, Ki Yong. / Influence of chemistry of chloride ions in cement matrix on corrosion of steel. In: ACI Materials Journal. 2010 ; Vol. 107, No. 4. pp. 332-339.
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abstract = "To assess the resistance of steel against corrosion, mortar specimens were manufactured with a centrally located steel reinforcing bar. The mortars were formulated by combining ordinary portland cement (OPC) with a single supplementary cementitious material. The proportions were 30{\%} pulverized fuel ash (PFA), 60{\%} groundgranulated blast-furnace slag (GGBS), or 10{\%} silica fume (SF) by weight. In addition, a pure OPC mortar was prepared. The mortar specimens contained chlorides from 0.0 to 3.0{\%} by weight of binder to accelerate the corrosion process. Then, the corrosion rate was measured by a polarization technique to determine the chloride threshold level for corrosion in concrete. The buffering capacity of the cement matrix to a pH reduction was quantified by measuring the acid neutralization capacity. The suspension consisting of distilled water and paste powder was exposed to nitric acid to characterize a decrease in the pH. As a result, the chloride threshold level for corrosion was dependent on binders, with values of 0.74 to 0.93{\%}, 0.48 to 0.59{\%}, 0.29 to 0.44{\%}, and 0.63 to 0.78{\%} by weight of binder for OPC, 30{\%} PFA, 60{\%} GGBS, and 10{\%} SF, respectively. It was found that an increase in the buffering capacity resulted in an increased threshold value, of which characteristics were used for a new representation of the chloride threshold. The threshold ratio of[Cl -]:[H+] for acidification to a pH value of 10 at corrosion accounted for 0.0063 and 0.0082, irrespective of binder type, at 1.0 and 2.0 mA/m2 (6.50 × 10-4 and 1.29 × 10-3 mA/in.2) of the corrosion rate, respectively.",
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Song, HW, Jung, MS, Lee, CH, Kim, SH & Ann, KY 2010, 'Influence of chemistry of chloride ions in cement matrix on corrosion of steel', ACI Materials Journal, vol. 107, no. 4, pp. 332-339.

Influence of chemistry of chloride ions in cement matrix on corrosion of steel. / Song, Ha Won; Jung, Min Sun; Lee, Chang Hong; Kim, Sang Hyo; Ann, Ki Yong.

In: ACI Materials Journal, Vol. 107, No. 4, 01.07.2010, p. 332-339.

Research output: Contribution to journalArticle

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AU - Jung, Min Sun

AU - Lee, Chang Hong

AU - Kim, Sang Hyo

AU - Ann, Ki Yong

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