Influence of crack width, cover depth and concrete quality on corrosion of steel in HPC containing corrosion inhibiting admixtures and fly ash

H. Z. Lopez-Calvo, P. Montes-García, V. G. Jiménez-Quero, H. Gómez-Barranco, T. W. Bremner, M. D.A. Thomas

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

© 2018 Elsevier Ltd In this study the influence of crack width, cover depth and concrete quality on corrosion of steel in high performance concrete was investigated. Three mixtures, one control and two more containing corrosion inhibiting admixtures, Calcium Nitrite and Disodium Tetrapropenyl Succinate, in combination with 20% fly ash replacement with respect to the cement weight were prepared. Specimens were concrete cylinders measuring 100 mm in diameter and 65 and 105 mm in length, with a 16-mm steel bar centrally placed at two concrete covers of 25 and 45 mm. Before being exposed to a simulated marine environment, the specimens were pre-cracked under a controlled splitting test with crack widths ranging from 90 to 330 μm formed perpendicularly to the reinforcing bars. During a 16-month exposure, the corrosion risk of the reinforcing bars was evaluated by half-cell corrosion potentials and the corrosion rate by linear polarization method. Also, the total integrated corrosion current was estimated. Results show that, albeit to different degrees, cracking was found to be an influencing factor in promoting corrosion of the steel in concrete with either 25 mm or 45 mm concrete cover; nevertheless, the effectiveness of the concrete cover depended greatly on the crack thickness. Results also revealed that corrosion inhibitors and fly ash were effective in delaying corrosion even in cracked concrete.
Original languageAmerican English
Pages (from-to)200-210
Number of pages178
JournalCement and Concrete Composites
DOIs
StatePublished - 1 Apr 2018

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Coal Ash
fly ash
Steel
ashes
admixtures
Fly ash
corrosion
cracks
steels
Concretes
Corrosion
Cracks
High performance concrete
Succinic Acid
Corrosion inhibitors
Nitrites
Corrosion rate
marine environments
nitrites
Calcium

Cite this

Lopez-Calvo, H. Z. ; Montes-García, P. ; Jiménez-Quero, V. G. ; Gómez-Barranco, H. ; Bremner, T. W. ; Thomas, M. D.A. / Influence of crack width, cover depth and concrete quality on corrosion of steel in HPC containing corrosion inhibiting admixtures and fly ash. In: Cement and Concrete Composites. 2018 ; pp. 200-210.
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Influence of crack width, cover depth and concrete quality on corrosion of steel in HPC containing corrosion inhibiting admixtures and fly ash. / Lopez-Calvo, H. Z.; Montes-García, P.; Jiménez-Quero, V. G.; Gómez-Barranco, H.; Bremner, T. W.; Thomas, M. D.A.

In: Cement and Concrete Composites, 01.04.2018, p. 200-210.

Research output: Contribution to journalArticle

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