Repair and rehabilitation

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.