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

Abstract

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

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

“…Hasil investigasi kerusakan balok beton berumur lebih dari 40 tahun yang terekspos pada lingkungan air laut dan didapatkan gambaran korosi alami yang terjadi menggunakan metode elektrokimia (Astuti et al, 2018). Dari hasil tersebut didapatkan kerusakan beton tersebut telah mencapai level akselerasi atau percepatan penurunan kualitas material dan kinerja struktur (Astuti et al, 2021).…”

Structural Damages Identification and Maintenance Design of Sports Facilities for Improving Performance and Infrastructure Resilience

“…Maintenance is essential for preserving the functionality, safety, and value of a facility (Astuti et al, 2019(Astuti et al, , 2022Poupard et al, 2006;Zhao et al, 2011). Buildings, being important assets, need careful maintenance to guarantee they can withstand and function at their best throughout their intended duration (Polder et al, 2014;Van Belleghem et al, 2021).…”

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

“…So far, no scholarly investigations have been undertaken to explore the utilization of batching plan refuse and seawater as mixing water in the mortar for patch repair material, specifically with regards to the mechanical characteristics of the materials that facilitate their application as construction materials. Patch repair is important rehabilitation method due to corrosion damage by removing the deteriorated concrete material and change to the new chloride free mortar material [42,43,44,45]. Numerous prior investigations have substantiated the viability of utilizing waste materials for the production of dependable building elements, hence offering notable benefits in terms of environmental concerns [2,7,8,17,26,46,47,48].…”