40 Guideline for professional use and application Inspectionof the floor surface Before starting any impregnation, it is essential to check whether the substrate itself is suitable for the intended use and if the surface is suitable for the treatment with OBTEGO products. If this is not the case, an afterwards impregnation does notmake really sense. Themain points to be checked are: Quality of the floor surface: The quality of the floor surface should have a compressive strength of at least 25 N/mm² (3.600 PSI). However, not only the compressive strength is an important point but also the scratch resistance/hardness of the surface. If scratching with a knife or a key causes scratches in the floor, or if finest aggregates break out, the floor surface is usually not suitable for any impregnation ormust be densified/hardenedwith silicates so far possible. Impregnation of new/fresh floor surfaces: Before a new floor surface can be impregnated, it is essential to determine its residual moisture. The maximum value can be found in the technical data sheet for the products used and it is usually ≤ 4% CM. Since a CM measurement is destructive, inmost cases electronicmeasuring devices such as capacitivemoisturemeters used. The company TRAMEX or TROTEC have proven themselves here. In some circumstances and due to remaining pore water, the floor surface cannot absorb the impregnation completely, evenly and sufficiently if the residual moisture is too high. This can lead to cloud formation, efflorescence or even limited functionality of the impregnation. Cleaning or diamond cleaning Before applying any treatment or surface protection, the floor surface must be at least washed several times with an auto-scrubber machine and suitable cleaning pads. An effective cleaning is necessary to remove superficial impurities, efflorescence, cement slurry, etc. If a cleaning just with auto-scrubber is not sufficient enough, it is recommended to use diamond cleaning pads or make a soft grinding/polishing step with resin bond diamond tools with grit # 100 or # 200 in order to remove e.g. marks from plastic foil (concrete curing), marks from power trowelling and slight roughness depth , for example. A diamond cleaning step with a grinding machine (not a single-disc machine) usually makes the floor surface even more appealingly. In both cases, the floor surface must be washed wet several times with an auto-scrubber machine after the grinding/polishing step. Just to use a vacuuming cleaner (dust extractor) after the grinding/polishing step to remove the dust from the surface (if dry grinding/polishing) and afterwardswet wipingwith amop is not sufficient enough. After cleaning process, the surface must be dry completely. Even after cleaning, the residual moisture must be controlled again before the impregnation can be applied. Pre-treatment (optional) If the floor surface shows cavities or larger pores, these must be closed before applying any impregnation. OBTEGO X-300 (repair mortar) is suitable to close breakouts or cavities. OBTEGO SP-100 pore filler can be used for pores up to a size of approx. 5mm.
RkJQdWJsaXNoZXIy OTIyMTYx