Concrete repair is done to restore and maintain strength and capacity to carry load , also architectural appearance, of the building or concrete structure as well as to prevent continuation in deterioration of the concrete structure due to corrosion of steel reinforcement or other adverse factors.

Before concrete repair process is taken, condition of the material (concrete) and the concrete structure itself should be examined in detail so that evaluation on level of damage of the structure is possible, along with being able to know cause of deterioration of the material and the structure. By knowing cause of deterioration, restoring and maintaining strength of the structure can be carried out efficiently and properly and even being able to stop further deterioration. Sometimes restoring and maintaining strength of the structure can’t be achieved only by patching with engineering materials (like an epoxy), given that selection for material type and the working process is done correctly and properly. In many cases, increasing strength by means of structural strengthening is necessary, as well as having the system to stop corrosion and rusting of the internal steel reinforcement and steel (or metal) structural components.

    Strengthening of Concrete Structures (Normal Reinforced Concrete Structures or Prestressed Concrete Structures) and Steel Structures This will be done to increase load carrying capacity of the structure (to carry more load or increase remaining safety margin after carrying load) or to improve structural behaviors like reducing deflection, movement, or vibration.

Strengthening of the structure with composite materials has advantages over the conventional strengthening methods (such as increasing cross section area of structural members) which come from material installation as well as working convenience, with only small interruption to serviceability of the structure, also high efficiency of this method, that allows for great increase of load carrying capacity and strength of the structure by installing a thin layer of composite materials on different parts of the structure. Another great advantage of strengthening by means of composite materials is no corrosion or rusting of the material itself.

Strengthening the existing structure with composite materials requires high skill and experiences in every step of the process ranging from structural analysis, design of the strengthening system, to site works and material installation. Otherwise the strengthening system installed may not work properly or may not work at all. In the worst case, the structure may collapse abruptly when the load that it carries reaches the highest level without a warning sign being given in advance.

If applicable, it is preferred that the structure is tested both before and after strengthening as this will give information on condition and status of the structure before and after strengthening. Information on condition of the structure before strengthening will be used in the step of structural analysis and in designing the strengthening system, with some assistance from structural engineering software.