Ronacrete Ronafix Sbr (Renders)
RONAFIX SBR (RENDERS)
RONAFIX SBR (RENDERS)
Admixture for waterproof / tanking renders
Ronafix SBR is a single part modified styrene butadiene liquid additive for cement mortars which enhances physical and chemical properties, allows mortars to be placed in thin section, provides waterproofing and resistance to frost and promotes adhesion to building surfaces.
Mortars containing Ronafix SBR are used for a wide range of applications where thin high strength high performance mortars are required. Typical minimum application depth is 10mm.
INFORMATION
DETAIL
There are 2 mix designs when using Ronafix SBR as a waterproof render. Ronafix Mix Design A is used for weatherproofing and Ronafix Mix Design E is used for tanking. Typical substrates for Ronafix SBR renders are brickwork, blockwork and concrete, following appropriate preparation.
BRAND
Ronacrete
PRODUCT TYPE
Lime, Mortar, and Cement
TEST AUTHORITY
British Precast Concrete Federation CMC Laboratories W & C French Ltd Ronacrete Laboratories.
COLLECTION
Ronafix
PRODUCTION
Made In United Kingdom
FEATURES AND BENEFITS
- Application from 10mm
- Admixture for site batched renders
- Conforms to BS EN 934-2 and 934-3
- Suitable waterproofing and tanking renders
- Excellent resistance to passage of water and water vapour
FLEXURAL TESTS
100 x 25mm x 25mm prisms
TENSILE TESTS
Dumbell Specimens
CEMENT (CEM II 42.5)
50kg
0/4MM SAND
125kg
WATER ADDITION
Water addition will depend on the sand water content. To test for correct consistency a ball should be made of the mortar, squeezing of the ball should not produce free liquid. When the ball is pulled apart it should separate in two pieces without crumbling.
LABORATORY RESULTS
Results shown are in N/mm². Maximum laboratory strengths are achieved by casting and curing cubes in ideal working conditions; site strengths will be lower.
SITE ATTENDANCE
When on site Ronacrete representatives are able, if asked, to give a general indication of the correct method of installing a Ronacrete product. It is important to bear in mind that Ronacrete Ltd is a manufacturer and not an application contractor and it is therefore the responsibility the correct practices and procedures to ensure the correct installation of the product and that liability for its correct installation lies with the contractor and not with Ronacrete Ltd.
YIELD
0.1m3
RONAFIX SBR
- Mix A : 9 Litres
- Mix E : 14 Litres
INSTRUCTIONS FOR USE
DAMPING
The prepared surface must be thoroughly dampened with clean water. All surplus and standing water must be removed before the primer is applied.
PACKAGING
Ronafix SBR is supplied in 5 litre, 25 litre, 210 litre and 1000 litre containers
PREPARATION
The substrate on which the Ronafix SBR render is being placed must be structurally sound and stable and suitable to receive and support a strong render. Surfaces should ideally be prepared by recyclical shot blasting, water/grit blasting or similar means to expose the aggregate and provide a mechanical key. All grease, oil, dirt and deleterious material must be removed by vacuuming.
SHELF LIFE AND STORAGE
Ronafix SBR should be stored unopened between 5°C and 25°C in dry warehouse conditions and out of direct sunlight. Do not allow to freeze. In these conditions shelf life is approximately 6 months.
PRIMING
Brush apply a primer of 1:1 Ronafix SBR : cement to the damp surface immediately before applying the Ronafix SBR modified mortar. Mix the primer thoroughly and apply evenly over the surface ensuring total and uniform coverage. Only prime an area which can be covered by the render within the working time of the primer. Note that the primer must not be allowed to dry. If it dries it must be thoroughly cross hatch scratched and reapplied.
CURING
As soon as possible after finishing the surface cure the surface with Ronacrete Curing Membrane. Alternatively use tight fitting polythene to prevent rapid moisture loss and surface cracking and crazing.
WORKING TEMPERATURES
Ronafix SBR renders can be used in most weather conditions and in a wide temperature range, typically from +5°C to 25°C and above. Note that at high ambient temperatures the working time of the mix will be reduced; it will be increased at lower temperatures. In cold weather the surface temperature of the laid render (not the air temperature) should be maintained at above 5°C during construction and for four to five days after laying. In this way the render will normally achieve sufficient strength to resist damage by freezing.
MIXING
Mix the Ronafix SBR modified mortar and apply in layers to achieve the required thickness, reform the original profile of the concrete and cover reinforcing steel. Layer thickness will vary according to the nature of the substrate, the shape and size of area being repaired and mixing and application technique.
Ronafix SBR modified mortars can be mixed by hand or machine. Machine mixing will more easily provide a mortar with even dispersion of mix components and a lower water/cement ratio. The use of a forced action mixer (eg. Creteangle or drill and paddle) will provide optimum performance; free fall mixers cause the mortar to ball up with a resultant reduction in performance and must not be used.
PLACING
As soon as the material is mixed render it onto the wet/tacky primer, using conventional plastering techniques ensuring total contact with the substrate and ensuring the render does not slump or slide away from the surface. If applying two or more coats of Ronafix SBR render apply each layer after the previous layer has firmed up sufficiently to support its weight without slumping or pulling away.
Keying and priming between layers is necessary to ensure total adhesion through the render. When applying waterproof renders using Mix Design E it is necessary to apply not less than two coats, each not less than 10mm thick. Joints must be staggered and the render should be carried down on to the floor to form a coving. The joint between a waterproof render and a waterproof screed must also be staggered.
