Rebar Corrosion Survey
We provide comprehensive rebar corrosion surveys, including non-intrusive identification and analysis of your concrete structures and their potential rebar corrosion.
What Is Rebar Corrosion?
Rebar, short for reinforcing bars, are steel bars which are commonly used as tension devices to reinforce structures and materials such as concrete. This is done as a means to both strengthen and aid the material under tension. Rebar corrosion is when these reinforcing bars come into contact with chloride ions over time and begin to accumulate rust, thus experiencing corrosion. Rebar corrosion can cause structural failure.
How To Identify Rebar Corrosion?
What Causes Rebar Corrosion?
Why Does Rebar Corrosion Need Repairing?
How Serious Is Rebar Corrosion?
Rebar corrosion is quite a serious occurrence given that it is extremely likely to negatively affect the structural integrity of structure it subsides in. In fact, the corrosion of reinforcing steel, along with other structurally embedded metals, is the leading cause of deterioration in concrete.
When reinforcing steel bars experience corrosion, the resulting rust tends to occupy a greater volume than the steel, in comparison. The expansion of the rust creates tensile stresses in the concrete structure which most often than not eventually causes cracking, delamination, spalling and much more – all of which substantially compromise the structural integrity of the structure. When this occurs, the structure then poses grave danger to its users as is more likely to sustain further and significant damage.
How To Prevent Rebar Corrosion?
There are certain method which can be undertaken as a means to prevent rebar corrosion. For example, the placement of crack-free concrete with low permeability and sufficient concrete cover is an effective way to do so. For this, low-permeability concrete can be achieved by decreasing the water to cementitious materials ratio of the concrete. In addition, the use of pozzolans and slag likewise increase the concrete resistivity and thus reduce the corrosion rate, even once it has already begun.
The use of corrosion inhibiting admixtures, coating of the reinforcement bars with an epoxy resin, and the use of sealers and membranes on the concrete surface are further ways which corrosion can be delayed or prevented. It is worth noting, however, that sealers and membranes are a preventative measure which have to be periodically reapplied.