Savcor Extends Life of Our Infrastructure
Savcor Cathodic Protection (CP) is a well-known and proven method to extend the service life of the reinforced concrete structures in case of chloride contaminated concrete corrosion. Corrosion causes massive repair work of wharfs, bridges or buildings with chloride ingress from sea water or de-icing salt.
Cathodic Protection can also be applied to any metallic structure that is in contact with an electrolyte. Cathodic Protection is commonly used in structures such as jetties, ship hulls, foundation of offshore wind mills, offshore oil drilling platforms and exterior of pipelines buried in soil or water. Especially, corrosion of steel piles and steel sheet piles buried in a corrosive soil or immersed in water can be stopped by installing a properly designed and engineered Cathodic Protection System.
Savcor Online Health Monitoring (OHM) provides extensive information about the performance of existing and new structures over their entire life cycle. It gives online information regarding structural reactions or of any stress caused by weather, traffic, snow or soil movements. The system can alert the operator before any dramatic failures occur, increasing safety and enabling cost effective repair and maintenance works.
Longer Life for New Concrete Structures
Savcor Cathodic Prevention is the most economical way to prevent corrosion
Conventionally, in case of Cathodic Protection in concrete, the most labor-intensive task is the installation work of the anodes. In new structures, the anodes can be installed directly to the steel reinforcement prior to concrete casting. When installing the CP during construction, savings in the CP installation shortens the payback time considerably, especially, in a corrosion intensive environment.
The maintenance access to bridge structures is usually very challenging, requiring extensive and complex scaffoldings. When a Cathodic Prevention is installed during the construction the access is there, already.
Furthermore, when protecting a pristine structure, the protection current requirement is much less than the amount of current required to stop an on-going active corrosion.
Savcor was selected by the Roads and Traffic Authority of New South Wales, Australia to develop a Corrosion Prevention system which would guarantee a 100 year corrosion-free life for the legendarily beautiful Lawrence Hardgrave Drive Sea Cliff Bridge (pictures). The extensive Savcor CP system covers the pile caps and tall columns supporting the bridge deck.
Corrosion of Old Conrete Structures
will be stopped by Savcor Cathodic Protection
Corrosion is one of the main reasons causing repair work of concrete structures. Contributing factors to corrosion of reinforced steel in concrete, typically, are design and construction failures, load and structural issues, environment (temperature and moisture) and concrete quality (low cover over the reinforcement, porosity, accelerators and other mixtures).
These factors together with chloride ingress from de-icing salt or sea water will lead to an increased risk of corrosion. Once chlorides have destroyed the protective oxide layer from steel surface, corrosion will initiate leading to material loss. Corrosion products which take more space than original rebar, will eventually cause cracks in concrete and later spalling of concrete.
Due to the fact that corrosion of rebars happen inside of concrete and can´t necessarily be noticed from the surface, corrosion in concrete often causes surprises. The structure may collapse or extensive rebuilding is needed.
Savcor Cathodic Protection (CP) is a well-known and proven method to extend the service life of the reinforced concrete structures in case of chloride contaminated concrete corrosion. Cathodic Protection is usually applied during the ordinary concrete repairs. Cathodic Protection System in concrete consist of external DC power source, non-soluble anodes, cabling, reference electrodes and a control unit.
Since 1981, Savcor has delivered hundreds of reliable and trouble-free Cathodic Protection Systems continuously controlled by Savcor or the customer. A Savcor CP is proven and build of best materials.
Cathodic Prevention or Protection of Concrete Structures
Cathodic Protection for concrete wharf, Hong Kong
DP World operates container Terminal 3 in the huge Kwai Chung wharf. The T3 had been commissioned already in 1972 and the rehabilitation of the wharf was unavoidable. During the works, Savcor delivered a Cathodic Protection system for the under-deck soffit and for the beams of the whole 305 meters length of the quay. The CP system consists of 75 individual circuits and was the first project to utilize Savcor MCONex rectifiers. The CP system was commissioned in 2011.
Cathodic Protection for reinforced concrete jetty, Norway
Statoil had a major rehabilitation done on wharves 2 and 3 of the Kårstö processing plant which is the largest export port of natural gas liquids in Europe. The rehabilitation work included installation of a Cathodic Protection System on the under-deck, total of 5250 sqm concrete area. Safety played a major role in Savcor’s System design as well as during the installation work. The wharves are all in the hazardous explosive area. Savcor’s in-house software added on important safety features and allowed Savcor to fulfill all the safety requirements to the CP system delivered.
Cathodic Protection for concrete wharf, Australia
One of the Port of Melbourne wharfs, Swanson Dock, required extensive rehabilitation works after 35 years of service. Included in the rehabilitation project was a large, 70-circuit Savcor Cathodic Protection System for the piles, beams and fenders of the almost 900-meter long deck. Swanson is a very busy container port and all installation work had to be done without any disruptions to the normal operations. Savcor has done similar work e.g. in China, New Zealand and Japan.
Structural Health Monitoring for cable-stayed bridge, Russia
The Golden Horn Bridge in Vladivostok, Far East of Russia, spans 737 meters across the Golden Horn Bay in the center of Vladivostok city and has the total length of 1389 meters. Pylons are 252 meters high.
Savcor OHM system monitors this top-class cable-stayed bridge securing its structural safety and prolonging asset life. Real time system monitors strain, tilt, vibration, GNSS displacement, weather data with wind speed and direction, air pressure, temperature and precipitation.
Cathodic Prevention for bridge pylons, China
The Hangzhou Bay Bridge in China was the longest ocean crossing bridge in the world at the time of its construction, spanning 36 kilometers across the Hangzhou Bay on the East China Sea. The bridge is located in a severe marine environment and durability was the major concern to achieve the required 100 years design life. Savcor designed and installed an Cathodic Prevention System during the construction period in 2006 and 2007 to provide long-term corrosion free life for its main pylons.
Cathodic Protection of reinforced concrete, Norway
Reinforced concrete in Vassås Bridge suffered of heavy chloride induced corrosion on reinforcement steel. The bridge was equipped with an automatic Savcor CP system which was installed and commissioned during 2005-2006. The system has been running excellently since then.