Crack repair – Spalls – Chips – Coving are carried out prior to the floor coating takes place. Each of these defects can be caused through different problems such as pressure, movement, moisture, and shrinkage or simply because the quality of the concrete has not been up to the standard where it is required to. There are different methods which can be applied when it comes to concrete crack repair, and each repair needs to be assessed individually on site to assure the correct method has been selected to carry out the repair.
Concrete Levelling & Repair Compounds will be used and applied to smoothen the concrete surface if it has too many imperfections, if the surface needs to be levelled, if a fall for drainage has to be achieved, or if the floor has to be built up to a certain height. Again there are different materials and methods to carry out this task and the chosen material depends on many factors and the environment where the material will be applied. Factors to consider would be if it is an indoor or outside concrete floor, if the surface has to withstand foot, vehicular or forklift traffic, or if there are mechanical, chemicals or other possibly impacts. Some customers prefer the rustic look of the imperfections, such like art galleries and they prefer to keep them.
Joint Sealing is an important application and should be carried out in a proper manner as structural joints are installed for deliberate expansion of the surface and should not be solid filled. Filling expansion joints with the wrong material will cause the joint to crack or even bring further damages and cracks somewhere else within in the surface due to the expansion gap being converted to a non-structural joint. Therefore it is important to use a professional joint sealer which will provide maximum joint movement and which is also UV stable. Keeping the structural joints being able to move will help to avoid/minimise damages to slab and coatings caused by movements.
Removal Old Coatings & Re-coating It is advised that old coatings always should be removed to assure best possible adhesion for the new coating system. There are many reasons eg. old coatings can hold contaminations, are not structurally sound, or are not suitable anymore to be the foundation of a new coating system. All new or old concrete surfaces should be prepared by mechanical grinding, abrasive blasting, blast-tracking, or any other suitable preparation/cleaning methods. Surface to be treated must be structurally sound and the substrate compressive strength should be at least 25MPa. All non-structural cracks, holes and surface deformities should be repaired. In general, the surface to be treated MUST be clean and free of all traces of loose material, dirt, debris, mildew, oil, grease, old coatings, curing compounds, release agents, laitance, dust and other contaminants.