Concrete Repairs

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Concrete repairs have been the core of our business since 1983.

Over the past 30 years Concrete Renovations Ltd have grown to become one of the most trusted names within the concrete repair industry. Based in the UK, Concrete Renovations Ltd use experienced, qualified concrete repairs operatives able to carry out both structural and cosmetic repairs to a countless variety of concrete structures from the largest bridges and tower blocks to simple window lintels.

Concrete Renovations Ltd are recommended contractors to many of the top concrete repairs material manufacturers including:


Weber

S.B.D Weber Ltd

Sika Ltd

Sika Ltd

Fosroc

Fosroc Ltd


PROJECT: FALLING CONCRETE NEEDS CONCRETE REPAIRS

Imagine finding this piece of concrete lying on the floor outside your workplace. Fortunately this piece of concrete fell harmlessly in the night, avoiding people and property but it isn't difficult to imagine the possible consequences if it hadn't.

Falling Concrete

BEFORE: Concrete Renovations Ltd were called in, in order to repair the rear lintel of this parade of shops in Kent when a worker found this piece of concrete in the space were she normally parked her car.

Fallen Concrete

AFTER: Concrete repairs were carried out by our specialist operatives using the Sika Monotop concrete repair system.

Fallen Repaired

Concrete Repairs - The basics

PATCH CONCRETE REPAIRS

Before approaching concrete repairs, consideration must first be given to the cause of the problem. This is fundamental to the success or failure of the repair, and a lack of adequate attention at this point can jeopardise the whole job.

If the problem has been diagnosed as being due to carbonation induced or chloride induced corrosion of the reinforcement, patch repairs may be used, although with the latter, there are precautions needed to ensure a successful repair. In these notes we shall deal with cracking and spalling due to reinforcement corrosion only. If the problem has been diagnosed as due to ASR or any of the other mechanisms of failure, the repair may need to be specifically designed for that particular contract and structure, and it is impossible to generalise about the approach which might be taken.


PATCH REPAIRING CARBONATION INDUCED CORROSION

It must firstly be understood that carbonation is a variable process and the carbonation front will probably not be uniform over the structure. Regular testing to determine the cover to the steel reinforcement and the penetration of carbonation, by the phenolphthalein spray method, will be required.

Criteria we have employed in the past have been to establish which areas of concrete repairs fall into the following categories:

  • Visibly spalled concrete with exposed steel reinforcement.
  • Areas which sound hollow when tapped lightly with a club hammer (these may often be found around actual spalled areas showing the problem is worse than is visually apparent).
  • Areas where the cover to the steel reinforcement is less than 10mm.
  • Areas where the carbonation front has encroached to within 5 mm of the reinforcement. (This necessitates carbonation testing at least every 2 metres or so).
  • Areas of honeycombed concrete.
  • Areas where the half cell potential values numerically exceed -200 mV (copper/copper sulphate). Using this criterion, however, caution must be exercised as half cell potentials only show areas of active corrosion. In the summer, whole areas of corrosion may shut down as the concrete dries out. Detection of carbonation induced corrosion is not as reliable as for chloride induced corrosion using the half cell method. If the above criteria have been followed, half cell potential testing is not strictly necessary but can be a useful additional aid to diagnosis.
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12 Fenlake Business Centre, Fengate, Peterborough , PE1 5BQ

01733 560362

sales@concreterenovations.co.uk

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