Effects of Anti-Icing Agents on the Durability of Concrete

Cremasco, Mark; Hansson, C.M.

doi:10.14359/51685615

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The Influence of the Cations in Anti-Icing Brines on the Corrosion of Reinforcing Steel in Synthetic Concrete Pore Solution

Hunt¹,

Hansson²

2015

Corrosion

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Concentrated salt solutions are currently being used as antiicing and deicing agents on the roads and highways in Ontario, Canada. The four commonly-used brines are predominantly CaCl2, NaCl, MgCl2, or a multi-chloride (CaCl2/NaCl) mix. The purpose of this investigation was to determine if the different cation(s) of the brine have an influence on the chloride threshold concentration for corrosion initiation of reinforcing steel and on the subsequent active corrosion rates. The tests were carried out in synthetic pore solution in order to allow for control of the chloride content and observation of any corrosion. The results show that the MgCl2 results in a significant drop in pH of the solution and a corresponding high level of corrosion, while the NaCl solution has the lowest chloride threshold value and most anodic corrosion potential.

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