Concrete

One thing everyone agrees on is that concrete cracks. Being very weak in tension, but strong in compression, concrete nearly always fails in tension. Nelson-Jones personnel have extensive education and experience determining the causes of concrete distress, along with the appropriate repair.

Many building owners figure they can call a concrete repair contractor directly, and they don't need to hire a repair consultant. While it is true that many contractors can perform concrete repairs, performing a long-lasting concrete repair can be much more difficult than it appears. N-J has investigated countless situations where patches were made that subsequently failed. Failures are most often traced back to an inadequate understanding of why the distress occurred in the first place, or the lack of outside supervision during the repair process.

Concrete repairs are always prone to failure because the bond between new concrete and old concrete will always be weaker than the original internal concrete strength. If the cause of the failure isn't first determined, repeated failure is a near certainty in most cases. N-J personnel are trained to investigate the cause of the distress, and design repairs that minimize the potential for future distress.

When implementing the repairs, repair quality is directly related to the skill and care used by the repair contractor. Even the best contractor is not likely to do their best job unless they are being supervised by a skilled owner's representative. We typically perform concrete observation before and after repair placement. The observation prior to placement the repair mortar is to assure adequate preparation of the surface. Observation after the repair is usually done using acoustic hammer sounding to determine if the repair is adequately bonded to the substrate. Even if the repair appears visually adequate, it may be prone to failure if not properly bonded.