mechanical properties of corroded-damaged reinforced concrete pile-supporting wharves

mechanical properties of corroded-damaged reinforced concrete pile-supporting wharves

corrosion is one of the significant deteriorations of reinforced concrete structures. it accelerated the performance loss of the structures, leading to a cross-sectional reduction of steel, which affects its mechanical properties, particularly its tensile capacity and ductility. the purpose of this study is to assess the serviceability and safety of corroded-damaged structures, particularly those exposed to aggressive marine environments.

a total of 54 pcs of 150 mm-diameter and 300mm-height of cylindrical specimen were cast. small-scaled specimens were accelerated to corrosion using impressed current techniques with a constant current density of 200 μa/cm2. samples were immersed in a simulated environment with a 5% solution of sodium bicarbonate during corrosion acceleration. corrosion alters the surface configuration of the steel bar.

pitting corrosions due to chloride aggression causes the residual cross-sectional area of corroded rebars to no longer round and varies considerably along its circumference and length. the reduction of the steel cross-sectional area has a significant impact on the degradation of the strength and durability of reinforcing structures. the residual capacity of the corroded reinforcement decreases with the reduction of the cross-sectional area of the steel reinforcement. the rate of corrosion affects the extent of the remaining service life of a corroded reinforced concrete structure.