Concrete Structure Investigations COVID-19 advice for clients

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Hello valued clients and contacts,

Concrete Structure Investigation’s response to the Covid-19 Level 3 alert, with the upgrade to Level 4 Wednesday midnight:

CSI can continue to work remotely on your queries for pricing and completing reports where data has already been collected., as our team can work remotely on these and share electronically for peer review.

CSI can go to site where the work is for Essential Services, but we will not be able to attend non-essential site work until the current Level is downgraded.

As with the rest of the country, we are very sorry not to be able to progress your business requirements beyond the points above. We wish you all to be safe and let’s hope we can beat the spread of the virus and be back to work as soon as possible.

If you are contacting us about some pricing here are some really good tips so that we can get it right for you:

To assist CSI’s representatives with ensuring that we can provide you with the most cost effective, accurate and timely pricing and service we request you please share with us any information that you may have about the structure or building you are enquiring about. Sending us all drawings, photos and any other relevant information will ultimately benefit your project and allow us to be more informed. Please see below for a list of required information.

If you have any of the below information please share it with us

  • As built plans (Structural and architectural)
  • Scoping Documents
  • Photos
  • Hazzard registers and health and safety plans
  • Asbestos registers

If you have information and are unsure that it is useful please do send it to us regardless, to be able to provide our best service we require to be informed.

Please contact Kurtis 0800 33 77 67 if you have any questions.

Best regards, The Team at CSI

Corrosion Control

1. What is Corrosion Control?

Corrosion control is preventing or slowing corrosion. 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.

2. When would you use Corrosion Control?

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)

3. What are the Benefits of Corrosion Control?

  • Prevents or slows rebar corrosion
  • Cheap to maintain once installed
  • Long service life

Corrosion Prevention

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.

4. Limitations

Standard – ASTM Standard STP 1137: Corrosion Forms and Control For Infrastructure


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