The Southeast Restoration Group Services

Rebar Corrosion...
A Serious Challenge

The restoration of concrete balconies is one of the largest expenses a condominium will face. Many owners are demanding a true solution, rather than disruptive and expensive, short term repairs. System ill cathodic protection combined with necessary repairs provides that long term solution.

Chloride-Induced Corrosion...

The characteristics of new concrete naturally inhibit corrosion activity of reinforcing steel. However, coastal structures are exposed continuously to salt-laden air. This exposure eventually saturates the concrete with chlorides and initiates corrosion activity on the reinforcing steel. These corrosion-cells result in expansive forces caused by corroding rebar, which cracks and delaminates the surrounding concrete. Delaminating concrete weakens the structure, creates potential hazardous falling debris and is visually unappealing. The corrosion-rate accelerates exponentially with time and is increased by other factors such as high temperature and humidity.

...Causes The Restoration Cycle

It may be a 10 to 15 year process for the first cycle of chloride contamination and concrete damage to occur. However, without proper corrosion-mitigating techniques, additional corrosion will cause new concrete damage in a relatively short time frame. This will result in ongoing concrete repairs, inconveniences, and expense. Eventually, the concrete may require full replacement.

Choosing a Repair Procedure

To avoid the ongoing repair cycle or full concrete replacement, impressed-current cathodic protection is the only proven technique to halt rebar corrosion in chloride contaminated reinforced concrete structures. By choosing a proper cathodic protection system, combined with necessary existing repairs, future concrete damage and expense can be eliminated cost­effectively.

"When chlorides are present in excess of the threshold. the use of sealants and water proofing membranes will not stop corrosion and may accelerate it"
-Nat'l Assoc. of Corrosion Engineers (NACE) NACE Standard RPO 390-90 Item No. 53073

The Permanent Solution
System III Impressed Current Cathodic Protection

Time-Tested Performance...

Cathodic protection has been successfully utilized on reinforced concrete structures for the last thirty years. Parking garages, bridges, balconies, and other concrete structures have confirmed the effectiveness of cathodic protection. Increased service life, reduced maintenance, and improved appearance are some of the benefits of implementing cathodic protection. Techniques have been developed and proven to utilize cathodic protection on residential oceanfront buildings.

...With Cost-Effective Results

Compared to the cost of repairing concrete repeatedly due to accelerated ongoing corrosion, cathodic protection is a financially sound investment. Spot repairing and sealing damaged concrete will not stop the corrosion cycle and will likely accelerate it. Over time cathodic protection savings are significant compared to multiple restoration projects. Also, concrete repair techniques with cathodic protection can be less intrusive, resulting in substantial savings.

Enhancing Your Investment

Coastal structures, such as oceanfront condominiums, are substantially increasing in value. They are designed to allow relaxation and enjoyment for their owners. Unfortunately concrete restoration projects can be very disruptive to that lifestyle. In many cases, concrete restoration projects can last a year or more and reoccur every 3 to 6 years. Cathodic protection will eliminate the need, once and for all, to endure costly and disruptive concrete restoration projects. Cathodic protection is an affordable and effective tool to ensure the preservation of the most vulnerable structural elements of coastal buildings.

"There is no question that properly installed and activated cathodic protection systems halt corrosion and corrosion induced concrete damage in salt-contaminated above ground reinforced concrete structures,"
-U.S. Dept. of Transportation SHRP-SM372

"Cathodic Protection is a proven, cost-effective method for controlling corrosion of reinforcing steel in above-ground reinforced concrete,"
-U.S. Dept. of Transportation SHRP-S -337. SHRP-S-372

Millions of Square Feet
Decades of Performance

System III Description

System III was developed by Mate or, a leader in the corrosion engineering industry, over the last 30 years. System III is designed to provide protection for at least 25 years.

The system can be installed to the balcony floors or ceilings, whichever is most convenient, and includes appropriate finish coatings for either.

The Corrosion Process

The need for cathodic protection becomes apparent with a basic understanding of the corrosion process in chloride-contaminated reinforced concrete. In order to have corrosion, you must have an ANODE and CATHODE. The anode "Corrodes" and also "protects" the cathode.

In the case of reinforced concrete with chlorides, the REBAR serves as both anode and cathode. Therefore, some areas will corrode and delaminate (the anodes) while other areas will not (the cathodes). When the anode areas are repaired, the chlorides in that area are removed and it then becomes a cathode. Surrounding areas that were cathodes then become anodes due to the electrochemical imbalance created by the chloride non-chloride concrete interface. New concrete damage then occurs at the new anodes.

Cathodic protection provides a long life "artificial anode" which supplies protection and makes all of the rebar the "cathode" or the non-corroding area.

System III provides anodes that are uniquely suited for balcony-type applications.

Stopping The Corrosion

Cathodic protection supplies a very low continuous DC current to the rebar. This overcomes and reverses the current flow naturally occurring due to reinforcing steel corrosion. Thus halting the corrosion activity.

"The cathodic protection system must be of the impressed current type"
-Nat'[ Assoc. of Corrosion Engineers (NACE) NACE Standard RPO 390-90 item No. 53073



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