RonaFix SBR (for Concrete Repairs) – Pallet Deals and Buy Buy

RonaFix SBR extended information

There are 2 mix designs when using Ronafix SBR as a concrete repair mortar. Ronafix SBR Mix Design A is used for concrete repairs where there is no exposed steel reinforcement and Ronafix SBR Mix Design D is used where any reinforcement is exposed.

All quoted data on the following page is based on tests conducted at 20°C.

RonaFix SBR physical properties

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.

RonaFix SBR Mix Design

Compressive Strength

RonaFix SBR Tensile Strength

Flexural Strength

NB 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.

Instructions For Use

RonaFix SBR Preparatiom

All concrete and defective material identified for removal must be removed back to a suitable substrate which is sound and stable and which will accept the repair mortar.

Reinforcing steel in the repair area must be exposed, and concrete cut back along the length of the steel to expose not less than 25mm of clean uncorroded steel. Loose rust and scale must be removed (eg. by the use of wire brushing and/or emery cloth or sand paper). Cut around the periphery of spalled areas to a minimum depth of 6mm at 90o to avoid dished edges and feather edged repairs.

The concrete must be removed around the steel to allow not less than 15mm of repair mortar to be placed around the steel. Corroded steel must be replaced where considered necessary by the engineer.

All removal of concrete and steel must be carried out in accordance with the specifiers recommendations.

All surfaces must be cleaned to remove loose dust, debris and surface contamination which may prevent adhesion of repair mortar to concrete and steel. When repairing chloride contaminated concrete steel must be grit blasted back to bright steel.

Damping

Following preparation of concrete and steel, thoroughly damp all concrete surfaces to be repaired. Remove any standing water. Water used must be clean and of potable quality.

Priming

Brush apply a 1:1 Ronafix SBR:cement primer coat to the steel and allow to become tacky, not dry. If the primer dries it must be thoroughly scarified and reapplied.

When priming coat on steel is tacky, brush a single coat of primer on to the damp concrete or substrate and apply a second coat on to the steel. Ensure that the first priming coat applied to the steel is not removed during the application of the second coat.

The Ronafix SBR repair mortar must be applied on to the wet or tacky primer before the primer dries. If the primer dries it must be thoroughly scarified and reapplied.

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.

RonaFix SBR Placing

Apply the mortar 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.

Materials may be applied using a combination of hand packing or traditional tools. The concrete repair mortar must be well compacted to prevent honeycombing and voids.

Apply the concrete repair mortar in successive layers to achieve the required thickness. Scratch the face of intermediate layers and apply a coat of Ronafix SBR:cement primer immediately prior to applying the next layer. If applying a protective or decorative coating leave the final layer with a sponged or wood float finish to aid adhesion.

Cure the finished repair with Ronacrete Curing Membrane or tight fitting polythene.

Storage

Ronafix SBR should be stored unopened between 5°C and 25°C in dry warehouse conditions away from direct heat and sunlight. Shelf life is approximately 9 months in unopened containers.