scholarly journals New developments for corrosion protection of concrete structures in Australia

2019 ◽  
Vol 289 ◽  
pp. 03003
Author(s):  
Atef Cheaitani ◽  
Samir Cheytani
Keyword(s):  
Corrosion Protection ◽  
Cathodic Protection ◽  
Research Work ◽  
Concrete Structures ◽  
Repair Work ◽  
New Developments ◽  
Work Related ◽  
Frequent Failure ◽  
Maintenance Requirements

The corrosion protection, repair and maintenance of reinforced concrete structures located along the coast of Australia has been a challenging task for engineers and asset owners over the past thirty years. Most of these structures are bridges and wharves which are situated in marine environments and are subject to tidal exposure. These environmental conditions create challenges in planning repair work, especially if electrochemical systems such as cathodic protection are installed for corrosion protection of these assets. While impressed current cathodic protection (ICCP) is a proven technology which can provide long-term corrosion prevention solutions for marine structures, this technology has been viewed by many asset owners as overly complex and expensive. There is the perception that ICCP systems require costly permanent monitoring programs and have high maintenance costs. These perceptions have been supported by the frequent failure of power supply units, and in some cases, widespread defects associated with ICCP systems such as grout acidification in concrete elements situated in tidal zones. The perception about the complexity of ICCP technology has led to the selection of less effective galvanic-based systems for the protection of assets, and systems which require no monitoring and have low maintenance requirements. This paper will present information on the new developments which have emerged from long-term experience and research work related to the simplification in the design, installation and improved monitoring of ICCP systems.

scholarly journals Development of the Asphalt Multi-Integrated Roller Field and Experimental Studies

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Abd El Halim Omar Abd El Halim ◽  
Amir Omar Abd El Halim ◽  
Moustafa Awadalla ◽  
Mohamed Adel Hassanin
Keyword(s):  
Research Work ◽  
Experimental Studies ◽  
Geographic Location ◽  
Field Trials ◽  
Asphalt Pavements ◽  
Flat Plates ◽  
New Developments ◽  
Long Term Performance ◽  
Term Performance

Asphalt pavements have been compacted using steel drum rollers for a century. However, the problems that are observed today on these pavements are universal with no solution in sight. Intensive research work has been invested to identify the mechanisms that cause these problems. A recent development was the introduction of SuperPave mix design, GP asphalt cements, and the use of reinforcing elements ranging from polymer to steel bars. Yet it seems that none of these solutions have succeeded in eliminating any of the old problems. The pavements suffer from serious distresses regardless of the geographic location of the pavements and its design, materials, traffic loads, and climate condition. This paper presents a new approach to deal with the problems facing the asphalt pavements. While the research efforts to date concentrated on materials-related solutions, this paper identifies conventional compaction equipment as the cause of many problems observed on the pavements. The paper provides the development of the new Asphalt Multi-Integrated Roller, AMIR, and discusses new developments leading to a number of commercial field trials on several Ontario highways. The paper concludes that current compactors must be replaced with soft flat plates in order to achieve the required specifications for long term performance.

An Experimental Study on the Application of Cathodic Protection Method Applying Zn-Al Metal Spray on the RC Structure

2008 ◽  
Vol 385-387 ◽  
pp. 665-668
Author(s):  
Man Hae Han ◽  
Han Seung Lee
Keyword(s):  
Reinforced Concrete ◽  
Corrosion Protection ◽  
Cathodic Protection ◽  
Concrete Structures ◽  
Corrosion Current ◽  
Reinforced Concrete Structures ◽  
Protection Method ◽  
Rc Structure ◽  
High Metal ◽  
Metal Spray

Cathodic Protection Method was introduced as a corrosion protection method of metals under the ground or sea. Since 1970, it was applied to corrosion protection method of reinforced concrete structures. After 1990, this method has been used around the world, and its usability was proved. But this method has some problems on the aspect of construction and economy. In order to solve these problems, Cathodic Protection Method by using high durable metal spray was developed. First, the specimen was covered with anodic materials (Zn, Al) by using metal spray. And a performance of corrosion protection was confirmed by measuring corrosion current and halfcell potential of specimen. Through the result of experiment, it is possible to know that Cathodic Protection Method by using high metal spray is good protect to corrosion on reinforced concrete structures.

Long-term performance and life-cycle-cost benefits of cathodic protection of concrete structures using galvanic anodes

2021 ◽  
Vol 42 ◽  
pp. 102467
Author(s):  
Naveen Krishnan ◽  
Deepak K. Kamde ◽  
Zameel Doosa Veedu ◽  
Radhakrishna G. Pillai ◽  
Dhruvesh Shah ◽  
...  
Keyword(s):  
Life Cycle ◽  
Cathodic Protection ◽  
Life Cycle Cost ◽  
Concrete Structures ◽  
Cost Benefits ◽  
Long Term Performance ◽  
Term Performance

scholarly journals Galvanic cathodic protection of corroded reinforced concrete structures

2018 ◽  
Vol 199 ◽  
pp. 05006
Author(s):  
David Whitmore
Keyword(s):  
Reinforced Concrete ◽  
Cathodic Protection ◽  
Concrete Structures ◽  
Reinforced Concrete Structures ◽  
The Public ◽  
Structural Repair ◽  
Structural Problems ◽  
One Step ◽  
Term Monitoring

Reinforced concrete structures can be designed and maintained to achieve long service lives, even in aggressive chloride environments. Unfortunately, many structures, such as bridges, piers, and wharves, show signs of active corrosion (e.g. rust staining, concrete spalling, etc.) in as little as 5 to 10 years. Left unchecked, chloride induced corrosion can lead to major structural problems. Many severely corroded structures have been replaced at great expense and with significant disruption to the public. As an alternative to demolition and replacement, a viable option is to repair and protect severely deteriorated structures utilizing a galvanic encasement that both structurally upgrades and catholically protects the structure. This approach can provide an effective, low maintenance galvanic cathodic protection solution for deteriorated concrete structures. Galvanic encasements consist of distributed galvanic anodes embedded in a concrete overlay or concrete jacket. The galvanic encasement may include additional reinforcing steel to create a one-step structural repair and protection system. This paper presents case studies on the use of galvanic encasements to repair and protect reinforced concrete structures. Long term monitoring of field projects over more than 10 years indicates that effective cathodic protection can be provided for 20 to 40+ years.

scholarly journals Structure-modulated CaFe-LDHs with superior simultaneous removal of deleterious anions and corrosion protection of steel rebar

RSC Advances ◽  
2021 ◽  
Vol 11 (18) ◽  
pp. 10951-10961
Author(s):  
Ji Young Park ◽  
Jimin Lee ◽  
Minseob Lim ◽  
Gwang-Myeong Go ◽  
Hong-Baek Cho ◽  
...  
Keyword(s):  
Corrosion Protection ◽  
Concrete Structures ◽  
Simultaneous Removal ◽  
Steel Rebar ◽  
Anionic Species ◽  
Chemical Factors

The three anionic species; chloride (Cl−), sulfate (SO42−), and carbonate (CO32−), are typical chemical factors that environmentally accelerate failure of concrete structures with steel rebar through long-term exposure.

Development of cathodic corrosion protection systems of nuclear ice breakers and arctic offshore structures

2021 ◽  
pp. 150-162
Author(s):  
G. I. Nikolaev ◽  
Yu. L. Kuzmin ◽  
I. V. Lishevich ◽  
O. A. Stavitsky ◽  
A. V. Podshivalov ◽  
...  
Keyword(s):  
Corrosion Protection ◽  
Cathodic Protection ◽  
Offshore Structures ◽  
Term Operation ◽  
Protection Systems ◽  
Arctic Ice ◽  
Atomic Icebreaker

This article presents the results of the development and implementation of special ice-resistant anodes on nuclear icebreakers and offshore structures, capable of ensuring long-term effective cathodic corrosion protection systems under shock and abrasive effects of Arctic ice. The results of inspections of the hull and hull elements of the cathodic protection of the nuclear icebreaker “50 Let Pobedy” and the offshore ice-resistant platform “Prirazlomnaya” after their long-term operation are shown. Cathodic protection of the atomic icebreaker “Leader” has been described.

LONG-TERM CORROSION BEHAVIOR OF CONCRETE STRUCTURES IN CHLORIDE-BASED INDUSTRIAL ENVIRONMENTS: CASE STUDIES

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Ioan Pepenar
Keyword(s):  
Corrosion Protection ◽  
Prestressed Concrete ◽  
Concrete Structures ◽  
Corrosion Damage ◽  
Structural Elements ◽  
Damage State ◽  
Intervention Measures ◽  
Industrial Environments ◽  
Resistance Stability

The paper presents two cases of reinforced and prestressed concrete structures damaged by corrosion in chloride-based industrial environments having as main aggressive agents: chlorine, hydrochloric acid and chlorides. To evaluate the corrosion damage of the concrete structures, in-situ and laboratory tests using specific investigation techniques were performed. Investigation of the damage state of structures revealed that many of the examined structural elements showed severe damage due to corrosion. This damage was in various stages of development and had a different influence on the resistance, stability and durability of structures. The corrosion-damage of the structural elements was favoured and accentuated by the absence of efficient intervention measures (repair, corrosion protection) for these elements. In order to ensure normal service conditions of the reinforced and prestressed concrete structures there were proposed intervention measures to remedy existing damages, regarding repair, strengthening, replacing, and corrosion protection of the damaged elements.

New Developments in the Mitigation of Corrosion Sn the Utility Field

CORROSION ◽  
1960 ◽  
Vol 16 (11) ◽  
pp. 543t-552t
Author(s):  
E. H. THALMANN
Keyword(s):  
Cast Iron ◽  
Complex Systems ◽  
Corrosion Protection ◽  
Cathodic Protection ◽  
Distribution System ◽  
Steel Structures ◽  
Stray Current ◽  
Metallic Structures ◽  
New Developments ◽  
Electrolytic Zinc

Abstract The use of distributed high silicon cast iron anodes for corrosion protection of an underground lead-covered cable distribution system is discussed. Electrolytic zinc cells for use on pipe-type cables and for control of induced voltages on pipelines also are considered. The use of well-type ground beds for cathodic protection of buried metallic structures at generating stations is described, and methods of protection of silicon rectifiers from damage because of surges are explained. The use of concrete as a coating on steel structures in shielded areas of cathodically protected complex systems is described. Other topics discussed include condenser water-box corrosion and dangers from stray current discharges. The use of zinc rich paint for protection of steel in certain situations is covered. Comparisons are made with conventional primers. 5.2.1

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