Influence of Rust Removal Process on The Effectiveness of Sacrificial Anode Cathodic Protection in Repair Concrete

Abstract

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.

Engineering properties of seawater-mixed mortar with batching plant residual waste as aggregate replacement

“…The results of compressive strength test on seawater-mixed and tap water-mixed mortar by using dried mortar waste as fine aggregate replacement were presented in Figure 8 and 9, respectively. The objective of understanding the compressive strength value of mortar is to choose which parent concrete or substrate that suitable to use the mortar as the patching material, due to the patching material requirement being equal to the original concrete quality [42,49,50,51,52].…”

Perilaku Lentur Struktur Balok Beton Bertulang Dengan Korosi Tulangan Hingga 50%

“…Hal ini mendukung tujuan penelitian ini agar dilakukan analisis untuk memprediksi perilaku struktur balok beton akibat korosi. Adapun metode perbaikan juga telah dilakukan menggunakan beberapa penelitian untuk mengkaji metode seperti mengaplikasikan proteksi katodik anoda korban dan inhibitor korosi, dan patch repair yang telah diaplikasikan pada specimen yang sama (Astuti et al, 2019) (Astuti et al, 2020).…”

Corrosion potential of coated steel bar embedded in sea-water mixed mortar

“…It was once feared that the use of seawater as a mixing water would reduce the durability and resistance of concrete due to chloride induced corrosion. So, several treatments on the steel bar embedded in sea water mixed mortar or concrete was required [10][11][12][13][14][15][16]. To prevent corrosion, several efforts have been made, one of which is to provide a protective coating for both the reinforcement and the concrete surface [9,17].…”