Cracks in concrete form for a variety of reasons including shrinkage, settlement, stress or reaction to load or temperature changes. Eventually leading to a loss in structural integrity or performance through exposure to chloride and/or carbon dioxide corrision. Crack injection provides a cost effective solution designed to stop corrosion and maintain the structural performance of the concrete.
It is important to note cracks need only be treated only when they are a potential threat to the integrity or causing major leaks. Injection can be used on cracks of 0.2mm to 5.0mm in concrete structures. Depending on the resin being injected, there is a lower limit of about 0.1 mm. Polymers used in injection include polyurethanes and epoxies, with different properties for different circumstances.
The surface of the concrete needs to be cleaned and free of any loose debris and contaminants. The crack is treated with clean dry air then the resin is injected under pressure either into inlet ports or through holes drilled to intersect the crack. Crack injection is a skilled process and should only be undertaken by approved contractors such as UKFF.