Influence of Chemistry of Chloride Ions in Cement Matrix on Corrosion of Steel
- Authors
- Song, Ha-Won; Jung, Min-Sun; Lee, Chang-Hong; Kim, Sang-Hyo; Ann, Ki Yong
- Issue Date
- Jul-2010
- Publisher
- American Concrete Institute
- Keywords
- buffering; chloride; corrosion; threshold value
- Citation
- ACI Materials Journal, v.107, no.4, pp.332 - 339
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACI Materials Journal
- Volume
- 107
- Number
- 4
- Start Page
- 332
- End Page
- 339
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/39669
- ISSN
- 0889-325X
- 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% ground-granulated 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% GCBS, 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/m(2) (6.50 x 10(-4) and 1.29 x 10(-3) mA/in.(2)) of the corrosion rate, respectively.
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