This study focuses on the monitoring of rusted and non-rusted rebar protected by sacrificial anode cathodic protection until 1000 days. Three specimens of RC beam structures having a length of 580 mm and 150x100 mm cross-section are fabricated. Two reinforcing barwith the same surface condition (ø 13 mm) were embedded in mortar parallel to each other with the intermediary distance of 40 mm and the cover depth of 30 mm in the bottom surface of the specimen. Discrete sacrificial zinc anode is connected to one rebar in patch repair section. During the investigation, the specimenswere exposed under three conditions, i.e., 20°C air curing, dry-wet cycle, and dry laboratory air. Potential of both rebar and sacrificial anode was monitored to check the condition of the cathodic protection system. The result indicates that non-rusted rebar condition in repaired patch concrete (chloride-free) is the most desirable initial condition when the sacrificial anode is applied on it to protect corroded steel bar in existing concrete (chloride contamination).
The accumulation of corrosion product on the steel surface may cause eventual failure to deliver of ionic current protection from sacrificial anode cathodic protection. The effect of cleaning of deteriorated steel bar before cathodic protection application is studied in this paper. Two specimens having a length of 580 mm and 150x100 mm of the cross-sectional area with deteriorated reinforcing bar and half-part of chloride contaminated concrete were fabricated to simulate the repair process. Two corroded reinforcing bar with the same surface condition (ø 13mm) were embedded in concrete parallel to each other with the intermediary distance of 40 mm and the cover depth of 30 mm in the bottom surface of the specimen. In the first specimen, rust on the steel bar surface in the repair section was removed. Discrete sacrificial zinc anode is connected to one steel bar in the repair section. During three-years observation, the specimens were exposed to several conditions: 20°C air curing, dry-wet cycle, dry laboratory air, and wet condition, respectively. Potential of both rebar and the sacrificial anode was monitored to understand the performance of the cathodic protection system. The result indicates that rust removal process of steel bar surface in repair concrete part is the most desirable initial condition when the sacrificial anode is applied on it to protect corroded steel bar in new and existing concrete.
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
Abstract Corrosion of steel rebar in bridge structures is a growing issue worldwide. A pilot research project on corrosion hazards in Indonesia was carried out by employing maintenance technology using sacrificial anode cathodic protection and corrosion monitoring system based on wireless information and communication technology. This paper presents experimental studies on Zinc Cartridge as a concrete repair systems and utilization of Titanium Wire (Ti-Wire) Sensor as a reference electrode in the concrete repair system by applying them to chloride-contaminated concrete exposed to a dry-tropical climate environment. From the reported work, it can be concluded that Zinc Cartridge affords excellent corrosion protection in dry-tropical conditions, and that Ti-Wire Sensor is reliable to be used as a reference electrode for rebar corrosion monitoring in concrete. Keywords: Zinc Cartridge; Ti-Wire Sensor; cathodic protection; corrosion protection; corrosion monitoring Abstrak Korosi baja tulangan pada struktur-struktur jembatan telah tumbuh menjadi suatu masalah di seluruh dunia. Suatu kajian awal tentang dampak korosi di Indonesia telah dilakukan dengan menggunakan sistem pemeliha-raan yang menggunakan teknologi proteksi katodik anode korban dengan dilengkapi teknologi pemantauan korosi berdasarkan sistem informasi dan komunikasi secara nirkabel. Makalah ini menyajikan suatu studi eksperimental tentang Zinc Cartridge sebagai sistem perbaikan beton dan pemanfaatan sensor Titanium Wire (Ti-Wire) sebagai elektrode referensi dalam sistem perbaikan beton, dengan menerapkannya pada beton terkontaminasi klorida yang terpapar lingkungan iklim tropis kering. Berdasarkan hasil studi dan pengamatan yang didapat, diperoleh kesimpulan bahwa Zinc Cartridge System mampu memberikan perlindungan korosi yang sangat baik dalam kondisi lingkungan tropis yang kering, dan sensor Ti-Wire dapat diandalkan untuk digunakan sebagai elektrode referensi untuk pemantauan korosi tulangan pada beton. Kata-kata kunci: Zinc Cartridge; Ti-Wire Sensor; proteksi katodik; perlindungan korosi; pemantauan korosi
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