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Pre-packed lightweight concrete repair mortar for repairing concrete on vertical and overhead surfaces where ease of application is as important as high strength. Bonds well to concrete, steel and other building surfaces, offering long term performance and protection to structures.
- Conforms to BS EN 1504-3 - high build repairs to 75mm, application from 6mm
- Pre-packed formulations offer assurance of consistent high performance
- Smooth surface finish prior to application of protective/decorative coating
- Monolithic adhesion
- Use with Ronacrete Standard Primer
- Ronacrete RonaBond HB25 - For professional and industrial use
RonaBond HB25 is a prepacked mortar used for repairing concrete on vertical and overhead surfaces where ease of application is as important as high strength. It can be applied in relatively thick section to walls and soffits and, depending on the nature of the repair, in layers up to 75mm deep in pocket repairs.
RonaBond HB25 is supplied prepacked requiring only the addition of water.
The cured mortar bonds well to concrete, steel and other building surfaces. It offers long term performance and protection to structures.
Quick Links - Click To Jump To Section:
- Features & Benefits
- Preparation of Concrete and Steel
- Damping and Priming
- Mixing
- Application
- Curing
- Test Data
Features & Benefits
- High build repair mortar
- Ease of application - up to 75mm
- Prepacked for control and convenience
- Smooth surface finish to receive protective/decorative coating
- Monolithic adhesion
- Strong - compressive strength >25N/mm² at 28 days
- Just add water
Preparation of Concrete and Steel
All concrete 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 clean uncorroded steel. Loose rust and scale must be removed. Cut around the periphery of spalled areas to a minimum depth of 6mm at 90° to avoid dished edges and feather edged repairs.
The concrete must be removed to allow no less that 15mm of repair mortar to be placed around the steel. Corroded steel must be replaced where necessary.
All removal of concrete and steel must be carried out in accordance with the specifiers recommendations.
When repairing chloride contaminated concrete the method used to prepare and prime surfaces may differ - consult Rawlins Technical on 0113 2455450 (option 2) or send a message to [email protected].
All surfaces must be cleaned to remove loose dust, debris and surface contamination which may prevent adhesion of the repair mortar to concrete and steel. Surfaces to be rendered must be cleaned and mechanically abraded to provide a key.
Damping and priming
Following preparation of concrete and steel, thoroughly damp all concrete surfaces to be repaired with clean, potable water. Remove any standing water.
Brush apply Ronacrete Standard Primer as appropriate to the steel and allow to become tacky, not dry.
When the priming coat on steel is tacky, brush a single coat of the same primer on to the damp concrete and 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.
Mixing
RonaBond HB25 must be mixed mechanically in a forced action mixer (e.g. Creteangle pan mixer) or using a slow speed drill (typically 500 rpm) with a paddle attachment (do not use a free fall mixer).
Pour the dry powder in to a mixing vessel containing approximately 2.8 litres (but not more than 3.0 litres) of clean potable water. Mix to produce an even consistency to suit the requirements of the applicator. Generally a drier mix can be applied in thicker layers; a wetter mix can be used to achieve a smoother finish.
Use complete packs to ensure consistency, uniform dispersion of pack contents and accuracy of powder:water ratio. To avoid a false set in warm working conditions store materials in the shade and use cool water.
Application
The RonaBond HB25 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.
Apply the mortar in layers to achieve the required thickness and to reform the original profile of the concrete and cover reinforcing steel. Layer thickness will vary according to the shape and size of the repair, the nature of the substrate and the mixing and application technique. Application techniques include hand packing the mortar on to the surface; this method allows faster build up and the ability to feel that the mortar has been packed around and behind reinforcing steel.
When applying multiple layers to achieve the total depth these can be built up monolithically (wet-on-wet) or after previous layers have firmed up. Keying and priming (with Ronacrete Standard Primer) between hardened layers is necessary to ensure total adhesion through the repair.
Finish the repair with a wood float, steel trowel or leave with a sponged finish as required. If applying a protective or decorative coating, leave the final layer with a sponged or float finish to aid adhesion.
Curing
Cure with Ronacrete Curing Membrane or tight fitting polythene as soon as possible and as quickly as is practical to prevent rapid and excessive early moisture loss and minimise the risk of resultant cracking and crazing. Curing is more important when working in direct heat, sunlight, in a drying breeze or wind, or a combination of these.
Note that maximum application depth per layer is dependent on the size and profile of the repair or render area, the consistency of the mortar and the skill and technique of the applicator. It is not always possible to achieve high build application, especially when working on larger areas.
Test Data
- Min / max thickness: 6/75mm
- Compressive strength @ 28 days: 25N/mm²
- Tensile strength @ 28 days: 2.0N/mm²
- Flexural strength @ 28 days: 5.0N/mm²
- Density: 1,350kg/m³
- Min / max application temperature: 3/25°C
- Water addition per pack: 2.8—3 litres
- Yield per pack: 15.5 litres
- Coverage per pack: 1.55m² @ 10mm
Data sheet
- Manufacturer
- Ronacrete
- For Use By
- Professional Use
- Interior / Exterior Use
- Interior & Exterior
- For Use On
- Concrete Walls
Concrete Soffits - Application Method
- Hand
- Pack Size
- 18KG
- Coverage
- 1.55m² @ 10mm
- Max. Application Temperature
- 25°C
- Min. Application Temperature
- 3°C
- Density
- 1,350kg/m³
- Layer Thickness
- 6-75mm
- Colour(s)
- Standard Colours
- Suitable For Use On
- Concrete Walls
- Suitable For Use On
- Concrete Soffits
- Application Method
- Hand
- Manufacturer
- Ronacrete
- Usages
- High Build Concrete Repair
- Usages
- Vertical Concrete Repairs
- Usages
- Overhead Concrete Repairs
- Product Usage Type
- Mortar
- Product Range
- RonaBond
- Colour Family
- Grey
Questions
Question about the product
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IMPORTANT SHIPPING & DELIVERY INFORMATION
Ronacrete RonaBond HB25 is only available with the shipping and delivery timescales listed below - please do not contact our Customer Support Team with enquiries about alternative or earlier shipping and delivery times.
Saturdays and Sundays, as well as Bank Holidays, are not classed as working days.
Orders placed after the cut-off for this product will not be processed for earliest dispatch until 9am the next working day.
All delivery costs below are excluding VAT
Ronacrete Standard Primer
Pre-packed polymer modified bonding primer. Conforms to BS EN 1504-4 Comprises polymer liquid and specially graded cements Used to provide a chemical bond between the substrate and new surfacing Only to be used with Ronacrete’s mortars and concretes including: RonaBond HB40 RonaBond HB25 RonaBond Concrete Repair Mortar Ronafix...
Ronacrete Curing Membrane
Spray applied curing membrane for mortars and concrete repair, flooring and renders, foming a surface barrier slowing the rate of moisture loss. Reduces chances of cracking Supplied ready to use Good coverage - 5.0-6.5m2 per litre Ronacrete Curing Membrane - For professional and industrial use More Information Delivery Info