Five Star* Repair Concrete
Shrinkage-compensated, high strength, flowing repair concrete
Five Star repair concrete is a pre-blended cementitious repair concrete which fully complies with the Highways Agency Specification for Highway Works and Department of Transport specification BD 27/86 for a high strength flowing concrete. Contains non-reactive aggregates and a low soluble alkali cement content. The repair concrete can be applied to a range of thicknesses, minimum 15 mm. Contains RHPC & PFA to clause 1702, 5 mm nonreactive carboniferous limestone to clause 1704, microsilica and shrinkage compensating agents.
Uses:
- Repair of concrete to bridge structures to HA model specification BD 27/86
- Replacement of concrete to beams and crossheads
- Repair of car parks, buildings, balconies and stairs
- Coastal structural repairs and seawall reconstruction
- Repairing concrete columns, beams, walls and soffits
- Infill concrete and anchorage of bolts to large bolt pockets
- For use under base-plates where thick sections are required to be grouted – 75 to 500 mm
Features & Properties:
- Repair of concrete to bridge structures to HA model specification BD 27/86
- Replacement of concrete to beams and crossheads
- Repair of car parks, buildings, balconies and stairs
- Coastal structural repairs and seawall reconstruction
- Repairing concrete columns, beams, walls and soffits
- Infill concrete and anchorage of bolts to large bolt pockets
- For use under base-plates where thick sections are required to be grouted – 75 to 500 mm
Technical Data:
The following test results were obtained in lab conditions at 20°C HA spec
| Working time | 45 – 60 minutes | |
| Set time | 225 minutes | |
| Plastic density | 2200 kg/m3 | |
| Water/cement ratio (3·3 litres per 25kg) | 0·37 | max 0·4 |
| Flow trough | |
| at 5°C immediately after mixing | 750 mm in 5 sec 750 mm in 30 sec |
| at 5°C 30 minutes after mixing | 750 mm in 6 sec |
| at 20°C immediately after mixing | 750 mm in 5 sec 750 mm in 30 sec |
| at 20°C 30 minutes after mixing | 750 mm in 6 sec |
| Flow in simulated soffit and top repair | At 5°C and 20°C Complies |
| Compressive strength BS 6319: Pt 2 | 5°C | 20°C | |
| 1 day | 16 N/mm2 | ||
| 3 days | 35 N/mm2 | ||
| 7 days | 45 N/mm2 | ||
| 10 days | 35 N/mm2 | min 29 N/mm2 | |
| 28 days | 65 N/mm2 | min 50 N/mm2 |
Cement content 500 kg/m3 min 400 kg/m3
Air content 2·8% max 7%
Tensile strength BS6319: Pt 7 (7 days) > 4 N/mm2
Bond strength > 2·5 N/mm2 (failure of concrete)
Static modulus of elasticity 28 – 32 kN/mm2
Coefficient of thermal expansion 6 – 10 x 10–6 mm/mm/°C
Coefficient of chloride ion diffussion 1·5 – 2·5 x 10–13 cm2 s–1
Technical data:
Weber’s Customer Services Department has a team of experienced advisors available to provide on-site advice both at the specification stage and during application. Detailed specifications can be provided for specific projects or more general works. Site visits and on-site demonstrations can be arranged on request.
