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A single-component, polymer-modified, high build cementitious mortar, designed for structural concrete repairs. It requires only the addition of clean water to produce a lightweight, low permeability, high strength mortar for both soffit and vertical repair situations.
- Complies with BS EN 1504-3 as an R3 mortar
- Fibre Reinforced
- Lightweight, low density structural repair mortar which allows speedier completion of work
- High build properties – up to 75mm vertically and 50mm in a soffit repair, without formwork
- Easy to apply, with excellent application properties
- Contains fibres and spray dried acrylic polymer
Description
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Preparation
Concrete substrates must be adequately prepared by use of scabbing, needle gunning or other means, as appropriate. Oil and grease must be removed by steam cleaning together with suitable detergent. Any contaminated concrete must be removed. All damaged concrete should be cut back to a sound surface and at least 15mm behind any exposed reinforcement. The edges of the repair should be cut perpendicular to the surface of the repair.
Note: Disc cutting is not recommended due to hazardous respirable crystalline silica that can be produced.
New concrete must be at least 14 days old.
Thoroughly saturate the concrete but remove excess water.
Steel substrates should be grit blasted equivalent to BS 7079-A1 and degreased immediately prior to application. Where corrosion is absent, wire brushing to a clean, bright surface may be adequate. Care must be taken not to polish the rust.
Note: Preparation of both concrete and steel must achieve a clean, sound, roughened surface.
Mixing
For bonding slurry, mix 2.5 volumes of Webercem bondcoat powder to 1 volume of clean water. Mix vigorously to a brushable, slurry consistency.
To mix Webercem HB40 a low-shear, forced-action mixer must be used. Hand mixing of the mortar is not recommended
Mix for 2-3 minutes from adding the powder to the water.
Over mixing will entrain air and reduce compressive strength. Do not over mix.
Water addition is 2.4 to 2.7 litres of clean water per 20kg bag. Start at 2.4 litres and adjust as required upwards to 2.7 litres. Do not add more than 2.7 litres of water.
Application & Curing
Ensuring the prepared concrete substrate is saturated but surface damp, use a stiff brush to scrub the slurry well into the surface.
Apply the mortar to the substrate whilst the bonding slurry is still tacky and compact well into place, ensuring no air is trapped.
The minimum application thickness is 20mm. Where very thick sections are required, multiple applications may be necessary. Intermediate surfaces should be scratched to give a good mechanical key. Successive applications require the use of Webercem bondcoat.
Finish with a wooden or plastic float or sponge to present a lightly textured surface. Otherwise, finish with a steel float for a tightly closed surface.
Unless a levelling mortar, coating, inhibitor, sealer or other system is to be applied to the surface, cure immediately after finishing with a suitable membrane.
Before application of a coating or a levelling mortar, cure the repairs by covering with closely-fitting polyethylene sheeting.
When cured, Webercem bondcoat Webercem HB40, and are stable to freeze/thaw conditions but, following good concreting practice, they should not be applied in freezing weather or onto frozen surfaces or at temperatures below 5°C.
Technical Data
| EN1504-3 | All tests carried out at 20°C unless otherwise stated | ||
|---|---|---|---|
| Performance characteristic | Method | Requirement | Result |
| Compressive strength | EN 12190 | ≥25 MPa | >40 MPa |
| Chloride ion content | EN 1015-17 | ≤0.05 % | 0.01% |
| Adhesive bond | EN 1542 | ≥1.5 MPa | >2.7 MPa |
| Carbonation resistance | EN 13295 | dk ≤ control concrete | dk ≤ control concrete |
| Elastic modulus | EN 13412 | ≥15 GPa | 15.2 GPa |
| Thermal compatibility Part 1 Freeze-thaw | EN 13687-1 | Bond strength after 50 cycles ≥1.5 MPa | ≥1.5 MPa |
| Capillary absorption | EN 13057 | ≤0.5 kgm-2h-0.5 | ≤0.1 kgm-2h-0.5 |
| Reaction to fire | EN 13501-1 | Declared class | A2-s1, d0 |
| Coefficient of thermal expansion | EN 1770 | Declared value | 2 x 10-6 /°C |
| Other Data | |||
| Performance characteristic | Method | Result | |
| Tensile strength of hardened mortar | BS 6319 | 1.3 MPa | |
| 14 day drying shrinkage | BS 1920-8 | 0.01% | |
| 21 day drying shrinkage | BS 1920-8 | 0.04% | |
| 28 day drying shrinkage | BS 1920-8 | 0.06% | |
Product Details
11491-1015001
Data sheet
- Manufacturer
- Weber
- For Use By
- Consumer Use
- Interior / Exterior Use
- Interior & Exterior
- For Use On
- Soffits
Concrete
Vertical Concrete Walls
Steel - Application Method
- Brush
Float - Single, Two or Three Pack
- Single
- Pack Size
- 20KG
- Min. Application Temperature
- 5°C
- Min. Application Temperature
- +5°C
- Shelf Life (from date of manufacture)
- 12 months
- UN Number
- N/A
- Base Type
- Acrylic
- Suitable For Use On
- Concrete
- Suitable For Use On
- Steel
- Suitable For Use On
- Soffits
- Suitable For Use On
- Vertical Concrete Walls
- Application Method
- Brush
- Application Method
- Float
- Manufacturer
- Weber
- Components
- 1K
- Usages
- Concrete Repair
- Product Usage Type
- Mortar
- Yield
- 13L per 20KG bag
Questions
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IMPORTANT SHIPPING & DELIVERY INFORMATION
Weber Webercem HB40 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