Airborne Chloride Intensity and Chloride Ion Penetration into Mortar Specimen in Thailand

Wattanapornprom, Rungrawee; Limtong, Pakpoom; Ishida, Tetsuya; Pansuk, Withit; Pheinsusom, Phoonsak

doi:10.4186/ej.2020.24.2.87

Cited by 6 publications

(1 citation statement)

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“…The sacrificial anode cathodic protection system is suitable for small infrastructures and limited budget cost repair. Some countries in Southeast Asia including Indonesia have long coastlines which concrete structures located in a hot and humid climate zone tends to deteriorate from the corrosion of the reinforcement by airborne chloride [35][36][37]. Even the sacrificial anodes cathodic protection is considered as the most effective and widely used in controlling chlorideinduced reinforcement corrosion [28,38,39]; however, the sacrificial anodes cathodic protection can lose its effectiveness with time due to the anode consumption during repair period [1].…”

Section: Introductionmentioning

confidence: 99%

Effective Use of Sacrificial Zinc Anode as a Suitable Repair Method for Severely Damaged RC Members Due to Chloride Attack

Astuti

Rafdinal²,

Yamamoto

et al. 2022

Civ Eng J

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In many cases, the repair strategy by using sacrificial anodes for cathodic protection in real RC structures requires additional zinc anodes after several years due to the decreasing protective area. This experimental study evaluates the effectiveness of time lag application of sacrificial anode cathodic protection applied to RC beam specimens that deteriorated severely due to chloride attack. In the experiment, sacrificial anodes and cathodic protection (SACP) were applied to 41-year-old RC beam specimens exposed to natural marine environments in which the embedded steel bars were significantly corroded. The repair work was performed in three stages. Instant-off and rest potential tests of steel bars were conducted periodically to demonstrate the time-dependent depolarization value. In the first stage, a polymer-modified mortar as a patch repair material was cast to replace the concrete in the middle tensile part with small sacrificial anodes embedded in the mortar. After the protective current reaches an equilibrium state, the sacrificial anodes are disconnected from the steel bars for a year, defined as the second stage. During the one year in the second stage, the steel bar in the patch repair area remained passive, without any sign of corrosion. As for the third stage, additional sacrificial anodes were installed in the existing concrete part to protect the steel in it. From one year of observation after applying sacrificial anodes to old concrete parts, the time lag SACP application of both in patch and non-patch repair parts was clarified to be effective in stopping the corrosion of steel bar in both parts until 20–30 years based on the service life prediction. Doi: 10.28991/CEJ-2022-08-07-015 Full Text: PDF

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