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32857 Parchem Technical Data Compendium 2015_Crop4emag.pdf

CONTENTS CONCRETE REPAIR CORROSION CONTROL GROUTS & ANCHORS PROTECTIVE COATINGS INDUSTRIAL FLOORING SURFACE TREATMENTS JOINT SEALANTS CONCRETE JOINTING ROOFING WATERSTOPS WATERPROOFING JOINT FILLERS TIMBER FLOORING ALPHABETICAL INDEX 524 ® Vandex® Concrete Grey Blinding concrete - one coat by brush at an application rate of 1.2 kg / m², or dry sprinkled onto the blinding slab immediately before pouring the overlaying slab. Properties Form: Cementitious powder Colour: Cement grey Bulk density: 1.15 - 1.35 kg / L Initial setting time: 40 - 80 minutes Full cure time at 20°C 50% 5 days RH: Physical or chemical change: Chemical cure Application temperature: 5°C - 30°C Service temperature (continuous ambient): Minus 40°C - 120°C Chemical Resistance Vandex Concrete Grey protects concrete against sea water, waste water, aggressive ground water and a range of chemical solutions. Vandex Concrete Grey is approved for use in contact with potable water and is therefore suitable for the treatment of water storage tanks, reservoirs, water towers etc. Maintenance No special requirements, any damage identified during normal inspections should be water blasted clean, repaired and recoated as appropriate. Specification Clauses Where so designated on the drawings, concrete surfaces shall have an in-depth crystal growth waterproofing compound applied. The in-depth cementitious waterproofing product must be permanent and capable of waterproofing static cracks and capillaries up to 0.3 mm in width. It must have a proven capability of sustaining pressures of 7.0 bar (70 metre head) while maintaining its waterproofing integrity. The waterproofing treatment must be compatible with the host concrete, non-toxic and be capable of being applied as a dry powder to fresh wet concrete, or as a slurry by brush, or spray application through a hopper gun to cured concrete. The waterproofing must be installed by a prequalified contractor nominated by the supplier and both the manufacturer and supplier must be accredited to ISO9001. Vandex Concrete Grey supplied by Parchem is such a product. Surface Preparation When applying Vandex Concrete Grey to existing concrete, all surfaces to be waterproofed should be clean, sound and free of concrete curing compounds, form release agents, paints and all other coatings. Concrete surfaces should be prepared by water blasting, grit blasting or wire brushing in order to remove the laitance and open the pore structure of the concrete in preparation to receive the Vandex Concrete Grey. Concrete surfaces should be free from major imperfections. All major imperfections must be repaired with a suitable cementitious reprofiling mortar such as Vandex Uni Mortar 1-Z which is suitable for reprofiling depths of 6 mm to 12 mm. Larger repairs may be carried out using a suitable cementitious repair mortar. Priming Priming is not normally required on good quality concrete substrates, however all surfaces must be pre-watered before applying Vandex Concrete Grey. Movement joints All expansion and movement joints should be sealed with a suitable joint sealant after application of the Vandex Concrete Grey. Consult your local Parchem office for advice on the joint sealing method best suited to your application. Cracks All shrinkage and non-moving structural cracks having a width equal to or less than 0.3 mm will be waterproofed by the application of Vandex Concrete Grey. Static cracks wider than 0.3 mm must be routed out to form a ‘V’ shaped groove with a hand or power chisel to a depth and width of approximately 25 mm. These larger cracks must be repaired by priming the chiselled out crack with two coats of Vandex Concrete Grey, followed by the application of Vandex Uni Mortar 1-Z to fill the rebate flush with the concrete surface. All of the above products must be installed ‘green on green’, before the previous layer has dried out. Live cracks cannot be waterproofed with Vandex Concrete Grey. If live cracks are present, Vandex BB75E-Z, an elasticised cementitious membrane should be considered. Consult your local Parchem sales office for advice regarding the best method of waterproofing live cracks. Water seepage All water seepage must be stopped using Vandex Plug prior to the application of Vandex Concrete Grey. Application Instructions Vandex Concrete Grey is supplied in the form of a dry powder and can be applied in as a dry powder or as a slurry by brush or spray. No mixing is required for dry powder application. When used as a slurry, Vandex Concrete Grey is mixed with clean tap water in the ratio of 5 parts Concrete Grey to 2 parts water by volume. The Vandex Concrete Grey powder and water must be thoroughly mixed using a slow speed electric drill (300 rpm) or Festo type mixer fitted with a grout mixing paddle (PC 770163) for 3 minutes immediately prior to use. Mix only as much material as can be used in 20


32857 Parchem Technical Data Compendium 2015_Crop4emag.pdf
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