Selectio9n of Repair Method

• Requires careful consideration - whether to meet special requirements for placing , strength , durability or other short or long term properties . 

These considerations include : 

1. Nature of the distress 
2. Position of the crack 
3. Environment 
4. WOrkmanship 
5. Cost 
6. Appearance 

1. Nature of the distress 

If a live crack is filled with a rigid materials , the repair material will either fail or some new crfacks will appear adjacent to original crack . 

- Repair to live cracks must either use flexible material to accommodate movement or else steps must be taken to eliminate movement 

2. Position of the crack 

- Methods which rely on gravity to place material into cracks are more successfully carried out on horizontal surfaces than vertical ones . 

3. Environment 

- If moisture or water are found in the cracks , it is necessary to rectify the leaks . 

- Repair may be complicated because structure is in service & the environment is damp . 

4. Workmanship 

- The skill of the workman carrying out the repair is important 

- It can mean the difference between a permanent repair & a premature failure . 

5. Cost 

- Cost of repair materials is usually small compared to cost of providing access , preparation  & labour . 

6. Appearance 

- The repaired surface may be unsightly especially  when it appearted on a prominent part of a building . 

- In this case , the repair system should include some form of treatment over the entire surface .