8-year performance of cathodic protection systems in reinforced concrete slabs and life-cycle cost benefits

Author(s): Deepak Kamde, Naveen Krishnan, Radhakrishna Pillai, George Sergi, Dhruvesh Shah,Rajendran Velayudham
Paper category: Proceedings
Book title: Proceedings of the International Conference on Sustainable Materials Systems and Structures (SMSS2019) Durability, Monitoring and Repair of Structures
Editor(s): Ana Baričević, Marija Jelčić Rukavina, Domagoj Damjanović, Maurizio Guadagnini
ISBN: 978-2-35158-217-6
e-ISBN: 978-2-35158-218-3
Publisher: RILEM Publications SARL
Publication year: 2019
Pages: 611-618
Total Pages: 848
Language: English

Abstract: NACE impact report (2016) states that nearly 50% of reinforced concrete (RC) structures experience major repair in about 10 years. The existing approach of conventional patch repair does not usually address the root cause and may not be durable – resulting in re-repairs in short period (say, 5 to 10 years) and substantial economic loss. Clients and practitioners do not adapt to cathodic protection technique as their preference, due to limited long-term performance data. Besides, clients wrongly believe that the installation of the anode can significantly increase the cost of repair. This paper presents data disproving these two wrong beliefs. For this, two slab specimens of (1 × 1 × 0.25) m were cast with chloride contaminated concretes (2% Clby weight of cement) and subjected to natural exposure for eight years. Protection current and corrosion potential were recorded at various instances during this period. It was found that the sacrificial anode systems could mitigate the corrosion of steel reinforcement in RC structures for long term. In addition, a case study was conducted on a coastal finger jetty repaired using a sacrificial anode cathodic protection (SACP) system. Depolarized steel potential was monitored for 4.5 years. For the same structure, life-cycle cost analysis was performed and compared with other service life extension techniques; such as cathodic prevention using sacrificial anode and the conventional patch repair using micro-concrete. It was found that the life-cycle cost of repair with sacrificial anode cathodic prevention and protection systems were significantly lower than the total cost of repair using conventional patch repair.

Online publication :2019
Publication type : full_text
Public price (Euros) : 00

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