Study of building strength includes all stages of investigations, field visits, and destructive and non-destructive tests on built buildings and subsequent measures defined in the specialized and non-academic spaces include demolition and reconstruction related to all building materials and special materials with particular specifications.

Improving the entire building involves a series of local improvements that are performed in several stages. In this case, the improvement should be foreseen and implemented in such a way that the goal is fulfilling to the other part of the sector, at a later stage. Improvement involves all repair, separation, increasing surface resistance of structure against stress, etc., which is determined by the type of improvement, design and execution.

In most cases, the lack of attention to simple and small executive points’ makes performance degraded and damages building safety. in other words, most of the large and small failures that are seen in structures are due to simple negligence, which usually not only does not save money, but also increases the cost of the product, and if these negligence works in repairing and strengthening, they will lead to disaster. .

The above steps show that, in order to ensure the success of improvement and reinforcement, the operation must be carried out in accordance with a specific plan, and executive specifications, steps and procedures must be fully and carefully observed in all details. As a general principle, improvement operations should begin when the time, materials, equipment, and persons necessary to start and finish them, according to a programmed plan, in potential predicted fluctuations are available.

Improvement operations are usually not fully implemented by the machine and, despite the use of various equipment and supplies, require significant handwork; this results that the success of operation on a large scale depends on the quality of work and skill of agent’s execution. Thus, employment of experienced, knowledgeable and committed to technical principles persons is one of the main criteria for improvement and refurbishment. It should be noted that proper maintenance of the parts after the completion of the operation and during the operation period also have a significant and decisive role in the reliability.

In refurbishment and improvement operations -different from the renovation operations- which are the basis are information, materials and methods of testing materials resistance, considering the nature of the improvement, the objective observations and experience of experts, will determine the methods of execution. The operating conditions of construction time, especially the concrete and its treatment, will have a great impact on the way in which operational methods are adopted, in such a way that measures from destruction to repair of concrete structures and … will vary.

Destruction of defective and damaged parts to reach the safe concrete is first step to eliminate defects in reinforced concrete structures. To determine the range of faulty concrete and faults in concrete nodes, we can use nondestructive and destructive tests.

The following may be some of the things that may be done in refurbishment and improvement operations:

  • Planting the rebar
  • Reinforcement
  • Preparation of destroyed surfaces
  • Filling the damaged areas with a repairing mortar
  • Substitute care
  • Leveling surfaces
  • Improvement of restored surfaces and …
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