الفهرس | Only 14 pages are availabe for public view |
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. |