Repair is the technical aspect of rehabilitation. It refers to the modification of a structure, partly or wholly which is damaged in appearance or serviceability.
The following factors to be considered repair of concrete structures:
· The cause of damage
· Type, shape and function of the structure
· The capabilities and facilities available with builders
· The availability of repair materials
1Stages of concrete repair
Repair of concrete structures is carried out in the following stages:
· Removal of damaged concrete
· Pre treatment of surfaces and reinforcement
· Application of repair material
· Restoring the integrity of individual sections and strengthening of structure as a whole
2 Repair procedure
A repair procedure may be selected to accomplish on or more of the following objectives:
· To increase strength or restore load carrying capacity
· To restore or increase stiffens
· To improve functional performance
· To provide water tightness
· To improve durability
· To prevent access of corrosive material to reinforcement
3 Types and classification of repair Types of repair:
· Cosmetic treatments on surfaces
· Partial replacement of surface and subsurface material
· Additional of reinforcements and bonding materials to strengthen the element
· Total replacement of the structural element
Classification of repair:
Classification of repair : Repair reqirements
Superficial : Cement mortar bonding by trowelling
General : Non structural or minor structural ;restoring cover to rebars
Principal : Significant loss of concrete strength; shotcreting for slabs and beams, jacketing for columns etc
Major : Demolition and recasting required.
