الفهرس 
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Abstract
The corrosion of reinforcing steel is the major cause of concrete deterioration,
collapse problems; so that the study of corrosion is very important in engineering field
The aim of this thesis is to investigate experimentally the structural behavior of the
reinforced concrete beams when exposed to high percentages of sodium chloride. Protection
by using the epoxy material was studied. Two repair methods were used. The first method
was by changing the thickness of ”Internal Protective Layer” which is a part of beam
concrete core above and adjacent to the main steel longitudinal bars. [Figure (2.9)]
The second method was by changing the internal protective layer coupled with using epoxy coating.
The experimental technique contains 55 reinforced concrete beams with fixed
dimensions (1.6 * 0.25* 0.1 m) cast using a common concrete mix, 4 control beams that were
not subjected to corrosion and the remaining 51 beams were subjected to corrosion by adding
different percentages of salts by weight of cement (S/C%) equal (1%, 5%, 10%) in the
mixing water of concrete mix.
In this study, many of different experimental variables were considered such as:
percentage of sodium chloride, corrosion duration, thickness of internal protective layer, and
steel coating by epoxy material.
All beams were tested up to failure, and the influence of variable factors on the
structural deformations, failure loads, strains, cracking behavior and modes of failure were
discussed. After testing in flexure the beams were broken to retrieve the reinforcing steel. The
steel bars were cleaned to assess the weight loss.
Keywords: experimental method, corrosion, chloride ions, R.c. structures, protection, repair,
epoxy coating, internal protective layer.