Concrete is a very tough,durable construction material that can be used for a variety of purposes and when it is re-inforced with steel can last for hundreds of years.Occasionally however if guidelines are not rigidly adhered to even this most durable of substances can be prone to something that is often referred to as "Concrete cancer". Concrete repairs are necessary because of the break up of the concrete surrounding the steel. This often happens because of sub standard materials and workmanship combined.Concrete repairs may also be necessary in domestic households because no expansion joint is installed in the appropriate places thereby causing severe cracking to path and patio areas.This is not difficult to do and just involves widening the joints and filling them before the frost causes further damage.Here at the London Builder we carry out all concrete repair operations and have many years experience in this field.