Case 2
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- Introduction
- Causes of Defects
- Good Practices
- Standards
- Maintenance and Diagnostics
- Remedial
- Similar Cases
- References
Remedial
The cracks should be filled in with plaster or mortar and then a coat of paint given to cover over the rust stains.
Where stain marks may be removed, use a mildly acidic detergent.
Repair using epoxy injection
One of the most versatile, crack repair method is epoxy injection. This method can be used to repair cracks which are narrower than 0.002 in [7].
Advantages
- Outstanding adhesive qualities to materials such as concrete and steel
- Resistance to a wide range of acids and alkalis and other chemicals, except acids such as nitric which have high oxidizing characteristics
- Rather vulnerable to organic solvents
- Low shrinkage when the compound course and changes from the liquid to the solid state
- High coefficient of thermal movement compared with concrete
- High compressive, tensile and flexural strength
- Appreciable loss of strength at temperatures over about 80oC
- High rate of gain of strength which can be varied to suit the particular application
The site conditions under which the resin will be applied must be stated to the formulator. Unless specially formulated, most epoxide resins must be applied to dry surfaces and the ambient air temperature and relative humidity during application must be kept within fairly narrow limit.