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 520 Page 2 ® Vandex® Cemelast Design Criteria In most waterproofing applications, Vandex Cemelast is applied in 2 coats by trowel or spray at a total thickness of 2.5 mm. Note: The maximum total thickness of all coats of the Vandex Cemelast system must not exceed 4 mm. Properties Form: 2 Components - cementitious powder + milky white liquid Colour: Cement grey (after curing) Density (wet mix): 1.65 Crack movement: 0.3 mm dynamic crack movement Elongation at break: 13% (20°C) Initial setting time: 2 - 4 hours Full cure time at 20°C 50% RH: 5 days Physical or chemical change: Chemical cure Application temperature: 5 - 30°C Chemical Resistance Vandex Cemelast protects concrete against agressive water, sea water, aggressive ground water and a range of chemical solutions. 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, surfaces to be waterproofed shall have a surface applied, flexible cementitious waterproofing membrane installed. The waterproofing product will be produced by mixing a cementitious powder component with a liquid polymer component. The waterproofing must form an impermeable layer on the surface of the substrate and must not rely on crystal growth within the substrate in order to be effective. The waterproofing treatment must be flexible and be capable of accommodating long term cyclic crack movement up to 0.3 mm without any loss of waterproofing integrity. It must have a proven capability of sustaining pressures of 1.5 bar (15 metre water head) even after sustaining 0.3 mm cyclic crack movement. The setting time for the waterproofing must be in the range 2 - 4 hours. The cementitious waterproofing membrane must be non toxic and be capable of being applied to concrete and masonry surfaces by trowel or by spray application through a hopper gun. 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 Cemelast supplied by Parchem is such a product. Surface Preparation When applying Vandex Cemelast to existing concrete or masonry, all surfaces to be waterproofed should be clean, sound and free of concrete curing compounds, form release agents, paints and all other coatings, dirt and contamination. 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 Cemelast. Concrete surfaces should be free from major imperfections. All major imperfections must 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 required on good quality concrete substrates, however all surfaces must be pre-watered before applying Vandex Cemelast. Movement joints All expansion and movement joints should be sealed with a suitable joint sealant after application of the Vandex Cemelast. Consult the local Parchem sales 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 can be waterproofed by applying Vandex Cemelast directly bridging over the crack. Live cracks can be waterproofed with Vandex Cemelast provided that the maximum crack movement does not exceed 0.3 mm. In the event of larger crack movement, consult your local Parchem sales office for advice regarding the most appropriate waterproofing system. Water seepage All water seepage must be stopped using Vandex Plug prior to the application of Vandex Cemelast. Do not attempt to apply Cemelast over weeping or seeping substrates no matter how slow the seepage, as the Vandex Cemelast will be damaged by the seepage water before it has a chance to cure.
Technical Dayta Sheet Compedium
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