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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 48 Technical Data SewperCoat® Dry Spray Sheet High performance mortar with superior biogenic corrosion resistance Description SewperCoat® Dry Spray is a mortar designed to provide exceptional resistance to the biogenic corrosion environment found in sanitary sewers. The unique biogenic corrosion resistance of SewperCoat® Dry Spray is due to its 100% calcium aluminate composition, i.e. the combination of calcium aluminate cement and calcium aluminate aggregates. SewperCoat® Dry Spray can be utilized to rehabilitate sewer infrastructures that have been damaged over years by biogenic corrosion. SewperCoat® Dry Spray can also be utilized to provide a protection lining to new infrastructures that will be exposed to biogenic corrosion conditions. SewperCoat® Dry Spray is a cementitious mortar that is fully compatible with the moist environment found in sewers. SewperCoat ® Dry Spray is supplied as a ready to use dry powder for use with standard dry spray gunite or shotcrete equipment. The success of this type of application is very much dependent on the skill and experience of the nozzleman that is using the equipment. Advantages The unique properties of SewperCoat® Dry Spray result from the chemical and mineral phases formed during the hydration process. SewperCoat® is unique when compared to other materials such as ordinary portland cement (OPC) concrete, epoxies, poly-vinyl chloride (PVC) or polyethelene because of its ability to inhibit bacterial activity which drastically reduces the production of sulphuric acid. The key advantages of the SewperCoat® Dry Spray are as follows: „ Inhibits bacterial activity „ Neutralizes sulfuric acid „ Readily adheres to damp concrete „ Easy Monolithic installation „ Provides Long Term corrosion protection „ Contains no VOC’s Technical Support Parchem offers a comprehensive range of high quality, high performance construction products. In addition, Parchem offers technical support and on-site advice to specifiers, end-users and contractors. Chemical composition of main constituents Substances Typical % by Weight Al2O3 39-44 CaO 35-40 SiO2 2-7 Fe2O3 9-15 Properties Compressive Strength (MPa) (AS 1478.2 - 2005) 6 hours >20MPa 24 hours >40MPa 28 days >70MPa Modulus of Rupture (Flexural Strength) (MPa) (AS 1012.11 - 2000): 24 hours >4.5MPa 28 days >8.5MPa Indirect Tensile strength (AS 1012.10 - 2000): 28 days >3.5MPa Dimensional Change (Drying shrinkage) (AS 1478.2 - 2005): 56 days <600 microstrains Application Instructions Preparation Clean the surface and remove any dust, unsound or contaminated material, plaster, oil, paint, grease, corrosion deposits or algae. Roughen the surface and remove any laitance by light scabbling or grit-blasting. Oil and grease deposits should be removed by steam cleaning, detergent scrubbing or the use of a proprietary degreaser. The effectiveness of decontamination should then be assessed by a pull-off test. Application The substrate should be thoroughly washed with clean water and any excess water removed prior to the spray application of the SewperCoat® Dry Spray. Apply the SewperCoat® Dry Spray to the prepared substrate using suitable guniting or shotcreting equipment. If sagging occurs during application to vertical surfaces, the SewperCoat® Dry Spray should be completely removed and reapplied at a reduced thickness on to the substrate.Note: the minimum applied thickness of SewperCoat® Dry Spray is 25mm. Finishing It is recommended that SewperCoat® Dry Spray can be left as an off the gun finish only. If trowel finished has to take place it is recommended to finish the material as soon as practically possible after spray application. January 2012


32857 Parchem Technical Data Compendium 2015_Crop4emag.pdf
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