Case 1
- Introduction
- Causes of Defects
- Good Practices
- Standards
- Maintenance and Diagnostics
- Remedial
- Similar Cases
- References
Remedial (see also Remedial)
- Identify the causes of the corrosion by chemical analysis.
- Repointing to mortar joints might be required.
- Bricks that are badly deteriorated should be replaced if necessary.
- Treat the surface with zinc or copper coatings which will inhibit corrosion.
- Apply water repellents to minimise water retention on the surface.
- The defective brickwork may need to be removed and replaced with a sulphate-resisting mortar.
- A protective coating such as epoxy should also be applied on the brickwork surface after repair (refer to good practice on coatings).
1. Repair of structural crack lines (Procedure of Surface Repair)
Surface repairs can be done on the floor slab if there are no signs of water seepage from underneath or widening of gap with time.
2. Polymer Modified Cementitious Grouting
This can be applied on the crack so that the final appearance of brickwork structure closely resembles the surface being repaired, in respect of strength and long term movement. Its characteristics are improved with regards to bonding, flexibility and time within which strength is gained.
3. Patching (Procedure of Patching)
The patching method is the most common repair method for minor brickwork defects such as surface spalls. Two types of materials are commonly used for patching up by hand:
Cementitious mortars such as cement mortar and polyester-modified cementitious mortar.
Resin-based mortars such as epoxy resin mortar and polyester resin mortar.
4. Repair using epoxy injection (Procedure of Epoxy Injection)
One of the most versatile, crack repair method is epoxy injection.