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03301 USING HUMECTANTS TO ENHANCE THE PERFORMANCE OF EMBEDDED GALVANIC ANODES

Product Number: 51300-03301-SG
ISBN: 03301 2003 CP
Author: D. Whitmore, S. Abbott
Industry: Highways & Bridges
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Embedded galvanic anodes are small puck-shaped devices used to provide sacrificial corrosion protection to the reinforcing steel in concrete structures. The anodes consist of a zinc core surrounded by a cementitious matrix. The addition of humectants to the mortar shell has been shown to increase the anode's electrical current output significantly. A large variety of chemical additives can be used to perform this function, however some may have detrimental side effects. In this study, the current output of a standard anode without humectant is compared against the output of anodes containing halide and non-halide type humectants. The anodes were identical in other respects, and were cast into concrete test slabs to simulate a field installation. The halide humectant generated the largest current output, and the control generated the least. However, while the halide salt yielded the most favorable results, it is potentially very damaging to reinforcing steel and may not prove to be a suitable candidate. More balanced options including the use of non-halide humectants and modified anode size and configuration hold promise, but require further examination to determine their long-term effect on anode output.
Embedded galvanic anodes are small puck-shaped devices used to provide sacrificial corrosion protection to the reinforcing steel in concrete structures. The anodes consist of a zinc core surrounded by a cementitious matrix. The addition of humectants to the mortar shell has been shown to increase the anode's electrical current output significantly. A large variety of chemical additives can be used to perform this function, however some may have detrimental side effects. In this study, the current output of a standard anode without humectant is compared against the output of anodes containing halide and non-halide type humectants. The anodes were identical in other respects, and were cast into concrete test slabs to simulate a field installation. The halide humectant generated the largest current output, and the control generated the least. However, while the halide salt yielded the most favorable results, it is potentially very damaging to reinforcing steel and may not prove to be a suitable candidate. More balanced options including the use of non-halide humectants and modified anode size and configuration hold promise, but require further examination to determine their long-term effect on anode output.
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