Effect of Concrete type (Normal Concrete and High- Performance Concrete) on the Corrosion Degree of Corroded Circular-Short Columns

Abstract

One of the major factors in the early degradation that shortens the service life of reinforced concrete buildings is corrosion of the steel reinforcing bars. As a result, maintenance and repair expenses go up. Steel reinforcement corrosion happens gradually. In the lab, accelerated corrosion methods are often employed to mimic the natural corrosion process. Experimental work to study the effect of the type of concrete used on the degree of corrosion of longitudinal (main) reinforcing steel for short circular concrete columns. The practical program consists of four columns with dimensions of (150×1000) mm and a thickness of the clear cover of (20) mm, two of which are reference columns (High-performance concrete and Normal concrete) and two columns subject to corrosion. Tested under the influence of anaxial load, the main variables adopted in the current research included the type of concrete used (Normal and High-performance concrete),The amount of reinforcing steel, the period of exposure to corrosion, the compressive strength, and other variables are constantfor all models, compared with the results between all samples on the amount of weight loss of the corroded steel, the surface area of ??the corroded steel, and the amount of decrease in the bearing capacity of the corroded columns. During the practical test, the results showed that by using High-performance concrete, the percentage of weight loss of the reinforcing steel is reduced by (31.61) and the percentage of cross-sectional area loss is by (6.81)%, while the percentage of decrease in the bearing capacity of columns is reduced by (52.59) % in the high-performance concrete.