CSI control corrosion by applying sacrificial anodes to steel reinforcement to prevent/slow rust. A rusting rebar has a higher volume than its non-oxidised counterpart and, when encased in concrete, causes it to crack. Sacrificial anodes slow this process by reducing the iron to ensure rust does not develop. The anodes are inserted and grouted into predrilled holes, and wired to the reinforcement.
You may use this service whenever you have metal particularly susceptible to corrosion, e.g. rebar in a marine environment (chloride ions in salt exacerbate corrosion).
While CSI curb the corrosion process by installing zinc anodes, another method, Impressed Current Cathodic protection (ICCP) is used to prevent corrosion occurring in the first place. ICCP forces a direct current from an external power supply to flow from an anode through the concrete to the reinforcing steel. A current of sufficient magnitude and direction is necessary to overcome the natural flow of electrons resulting from the corrosion process.
The direct current is supplied from an external source, most often an AC/DC (transformer) rectifier.
Standard – ASTM Standard STP 1137: Corrosion Forms and Control For Infrastructure
May 26th, 2022
Over the Easter break, the Directors at CSI have been working hard in the Britomart Tunnels to provide effective service […]
March 2nd, 2022
PROJECT REQUIREMENTS To help construct an extra ICU space in a hospital, sinks had to be added. This required coring […]
November 11th, 2021
The design engineer was on site with the drillers to check our scan marks and do some test drills.
Kurtis and his team showed highly skilled reading of scan results. These allowed them to be the only ones who successfully located the defects (random voids) in Polystyrene blocks filled with concrete and lined with Gib in a prepared area...
Maynard Marks
Engaging CSI to conduct the Pile Integrity Testing on the large 1.8m diameter piles was a wise choice. Their technicians were knowledgeable, approachable, punctual, health and safety conscious and flexible when we encountered late changes to the works programme. Results...
Fulton Hogan
As requested, the workers from CSI ltd contacted this office on arrival at the site and invited me (Kevin J Heays) to site visit and get an understanding of the intended works. I was impressed with the workers knowledge of...
Kevin Heays (ECANZ)
The CSI team were great and they did a good job for us. They were employed to complete QA on a Wellington Apartment Development using Pile Integrity Testing. We would recommend CSI to others in the future.
Richardson Drilling
CSI did a good job for us at an Auckland Apartment building; saving our team from drilling through services which would have caused considerable delays. We would recommend CSI to others for scanning
Allendale Electrical
CSI provided a great service. We could not advise them on areas of improvement as their service was highly professional.
Wilson Building
We found CSI via their website and were grateful that we had. Their service was highly professional.
Artisan Developments Ltd
CSI have completed several jobs for us. They are highly skilled operators.
Tracer Construction
CSI was recommended by a health board, and they did a great job for Q Interiors. We are already looking at employing them for future work.
Q Interiors
The service and follow-up of CSI Ltd was excellent. We would definitely use them again.
Grayburn Property Service
CSI Ltd did a great job for us. When we were asked what improvements could be made, we could think of no gaps in their professional service.
Trademark Building Services
CSI Ltd were recommended to us and did a great job. We would be happy to recommend them to others.
Stanley Construction
We were recommended CSI by an Engineer and he was absolutely correct; their GM particularly communicated well and was highly professional.
MSC Consulting Group
CSI has completed some exciting projects with Novare Design “I am very impressed at the responsiveness, relevance and accuracy of the testing and data supplied to Novare for some recent strengthening projects. We have worked with CSI on several projects...
Novare Design
Darren, Ali and the team at CSI have been a great help at the Oaks Shores refurbishment project. CSI was willing to work through the difficulties of travel under various Covid-19 levels, ensuring they could be of assistance in Queenstown...
Brosnan Construction
