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Technical Dayta Sheet Compedium

CONTENTS CONCRETE REPAIR CORROSION CONTROL GROUTS & ANCHORS PROTECTIVE COATINGS INDUSTRIAL FLOORING SURFACE TREATMENTS JOINT SEALANTS CONCRETE JOINTING JOINT FILLERS WATERPROOFING WATERSTOPS ROOFING TIMBER FLOORING ALPHABETICAL INDEX ® Application Instructions Vandex Cemelast is supplied as 2 components. The powder component BB75-Z is mixed with a milky white liquid component, Cemelast liquid to produce a slurry which can be applied by trowel, brush or spray. To mix, place 25 kg of Vandex BB75-Z into a clean container and add 9 kg of Cemelast liquid. The Vandex BB75-Z powder and Cemelast liquid 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 minutes and stir the mixture frequently. If the mixture starts to set, do NOT add water, simply stir the product to restore workability. Ensure that all surfaces to which Vandex Cemelast will be applied are pre-watered. The correct amount of prewatering Page 3 521 is measured by the substrate taking on a greenish appearance, however there must be no free surface water. A simple check can be performed by placing a hand on the pre-watered substrate and removing the hand. If the hand is wet from contact with the substrate, then the substrate is too wet and must be allowed time for the excess surface water to evaporate. Surfaces that have been pre-watered and dry out before application of the Vandex Cemelast must be prewatered again. Apply the first coat from the base of the wall and work towards the top using a trowel or by spray with a hopper gun. After 2-4 hours apply the second coat “green on green” so that a chemical bond is achieved between the two coats. Do not apply more first coat during a day’s work session than can be overcoated with a 2nd coat during the same day. When applying Vandex Cemelast by spray using a Vandex hopper gun, ensure that the gun is held directly perpendicular to the surface at a distance of about 500 mm to ensure that the maximum impact energy is applied to the surface and to prevent any shadowing across small surface imperfections. After application of the first coat by spray, brush or trowel the wet surface to remove any entrapped air. When applied by hopper gun, Vandex Cemelast produces a rough textured finish which will need to be trowelled smooth with a steel trowel. The cure time of Vandex Cemelast is affected by both temperature and humidity. Humidity has an influence on waiting times between coats and resistance to rain. Ensure that the freshly applied Cemelast is protected from rain for the first day, and the drying effects of the sun and wind during the first 5 days of cure. In most waterproofing applications, Vandex Cemelast is applied in 2 coats by trowel or spray at a total film thickness of 2.5 mm. Curing and protection Surfaces treated with Vandex Cemelast must be protected from rain, ponded water and the drying action of direct sunlight for a minimum period of 5 days after application. Protect all treated surfaces from wind and frost by covering with plastic sheeting, tarpaulin or equivalent. Cleaning Tools and equipment should be cleaned with water immediately after use. Limitations Vandex Cemelast is suitable for use in open headed sewerage processing tanks. Consult Parchem for specific advise on the use of Vandex Cemelast in closed sewerage environments where sulphuric acid concentrations may be high. In negative side applications, do not apply Vandex Cemelast to substrates that are weeping. Use Vandex Plug to stop all water seepage before applying Cemelast. Vandex® Cemelast


Technical Dayta Sheet Compedium
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