Structural 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


1. Stages 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 surface

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 : 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.    

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