Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7883931 | Cement and Concrete Composites | 2018 | 11 Pages |
Abstract
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 100â¯mm in diameter and 65 and 105â¯mm in length, with a 16-mm steel bar centrally placed at two concrete covers of 25 and 45â¯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 330â¯Î¼m 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 25â¯mm or 45â¯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.
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Authors
H.Z. Lopez-Calvo, P. Montes-GarcÃa, V.G. Jiménez-Quero, H. Gómez-Barranco, T.W. Bremner, M.D.A. Thomas,