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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 JOINT FILLERS WATERPROOFING WATERSTOPS ROOFING TIMBER FLOORING ALPHABETICAL INDEX Technical Data Sheet Water resistant polymer additive, to provide good adhesion to concrete Uses For improving and bonding concrete repair mortars, cementitious floor toppings and screeds, waterproof renders and cementitious slurries. Cementitious mortars are alkaline in nature and will protect embedded steel reinforcement. Mortars produced with Nitobond SBR may be used for horizontal, vertical and overhead repair work. Nitobond SBR may also be used to form a bonding agent for slip bricks, ceramic tiles, etc. Advantages „ Excellent bond to concrete, masonry, stonework, plaster September 2007 75 and blockwork „ Improved tensile and flexural properties allow thin applications „ Single component liquid can be easily gauged as required „ Improves cohesion and workability „ Improves mortars to provide waterproof repairs, renders and toppings which are highly resistant to freeze/thaw cycling „ Contains no chloride admixtures Description Nitobond SBR is a modified styrene butadiene rubber emulsion which is supplied as a ready to use white liquid. It is designed to improve the qualities of site-batched cementitious mortars and slurries. Being resistant to hydrolysis, it is ideal for internal and external applications in conjunction with cement. Technical Support Parchem offers a comprehensive range of high performance, high quality concrete repair and construction products. In addition, Parchem offers a technical support package to specifiers, end-users and contractors, as well as on-site technical assistance. Design Criteria The application parameters for mortars modified by the use of Nitobond SBR will differ depending on the actual mix design used. Generally, however, Nitobond SBR mortars can be applied in sections up to 40 mm thickness in horizontal locations and up to 15 mm in vertical locations. The thickness achievable in overhead locations without the use of formwork is largely dependent on the profile of the substrate. Vertical and overhead sections greater than those stated above may be built up in layers but may sometimes be possible in a single application dependent on the actual size and configuration of the repair area, and the volume of any exposed reinforcing steel. Nitobond SBR mortars should not be applied at less than 6 mm thickness. Thicknesses up to 40 mm in a single application can be achieved by the use of formwork. Consult your local Parchem office for further information. Properties The results listed below were achieved by assessing the mechanical properties of a 3:1 sand:cement mortar containing Nitobond SBR in the proportions 10 litres per 50 kg cement against a 3:1 sand:cement control mortar. The test methods used were in full accordance with BS 6319 at 28 days - air cured. Compressive 62 MPa strength: Tensile strength: 3.3 MPa Flexural strength: 9 MPa Slant shear bond: 53 MPa Chemical resistance: Cementitious materials have limited chemical resistance. The addition of Nitobond SBR to cement mortars reduces permeability and therefore helps reduce the rate of attack by aggressive chemicals, acid gases and water Specification Clauses Polymer bonding aid and mortar additive The polymer bonding aid and site-batched mortar shall be modified by the use of Nitobond SBR, a single component styrene butadiene rubber emulsion. Application Instructions Preparation Saw cut or cut back the extremities of the repair locations to a depth of at least 10 mm to avoid feather-edging and to provide a square edge. Break out the complete repair area to a minimum depth of 6 mm up to the sawn edge. Clean the surface and remove any dust, unsound or contaminated material, plaster, oil, paint, grease, corrosion deposits or algae. Where breaking out is not required, 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. Expose fully any corroded steel in the repair area and remove all loose scale and corrosion deposits. Steel should be cleaned to a bright condition paying particular attention to the back of exposed steel bars. Grit-blasting is ecommended for this process. Fosroc® Nitobond SBR


32857 Parchem Technical Data Compendium 2015_Crop4emag.pdf
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