Ronacrete Ronafix For Bedding

Ronacrete Ronafix For Bedding is a single pack liquid additive to enhance physical and chemical properties of cement mortars to promote adhesion, waterproofing and resistance to frost.

Best Uses

Ronafix For Bedding 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 are used for a wide range of applications where thin high strength, high performance mortars are required. Typical minimum application depth is 6mm.

• Thin section application
• Provides a strong and durable bond to the prepared concrete
• Waterproof
• Frost-proof
• Increased physical properties
• Excellent adhesion

Mix Design

• Cement: 50 Kg (By weight)
• Medium Sharp Sand: 125 Kg (By weight)
• Ronafix: 14 Litres
• Water: 4 litres (approximately)

See the data sheet for the full mix requirements.

Application

Preparation

The substrate on which the Ronafix mortar is being placed must be structurally sound and stable and strong enough to support the weight of the mortar and the component being bedded. Surfaces should ideally be prepared by mechanical abrasion, e.g. scabbling, water/grit blasting or similar means to expose the aggregate and provide a mechanical key. All coatings, grease, oil, dirt and deleterious material must be removed. Similarly, clean the back of the component.

Damping
The prepared surfaces must be thoroughly dampened with clean water. All surplus water must be removed before the primer is applied.

Priming
Brush apply a primer of 1:1 Ronafix : cement to both surfaces, substrate and component, immediately before applying the Ronafix 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 mortar 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 hatched scratched and reapplied.

Mixing

Ronafix 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 Screedmaster) will provide optimum performance; free fall mixers cause the mortar to ball up with a resultant reduction in performance and must not be used.

Depending on the quality of mixer used and the moisture content of sands and aggregates it may not be necessary to add the full amount of water specified in the mix design. When using an efficient mixer, a mixing time of 2-3 minutes is normally sufficient. Do not overwork the mix as this will entrain air and may affect performance. Once mixed the mortar should be used as quickly as possible.

Placing

As soon as the material is mixed render it onto the wet/tacky primer or trowel on to the back of the component being bedded and place the component in position ensuring compaction. Remove excess mortar, taking care not to stain the surface. Support if necessary until the mortar has hardened sufficiently to support the component.

If required the joints can be raked out, taking care not to disturb the bond, and repointed with a coloured mortar.