Mechanical Properties of Corroded-Damaged Reinforced Concrete Pile-supporting Wharves

Abstract

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. Doi: 10.28991/cej-2020-03091624 Full Text: PDF

Assessment and Evaluation of Blended Cement Using Bamboo Leaf Ash BLASH Against Corrosion

“…Specimens that have a lower resistance against corrosion deterioration have higher corrosion rates, and they have a significant reduction in mass [17]. The reduction in the cross-sectional area of steel rebars was greater with 15% and 20% BLASH content as compared with 10% content of bamboo leaf ash admixtures.…”

“…According to Dacuan and Abellana (2020), a wider crack width accelerates the ingress of deleterious substances into the concrete surface. This leads to a faster deterioration in the corrosion of steel reinforcements [17]. As shown in Figure 12, mixtures of cement with more than 10% bamboo leaf ash content are more prone to deterioration because they have wider crack widths.…”

“…According to Ademola and Buari (2014), corrosion has a detrimental effect on its structural performance, which significantly reduces the lifespan of structures [15]. Corrosion reduces the residual capacity of steel reinforcement, which affects the extent of residual serviceability of structures [16,17].…”

Free Span Analysis for Submarine Pipelines

“…is method is based on possible changes of the loads and material properties [15]. e limit state method considers uncertainties related to the loads and material properties; therefore, it uses relative safety factors to gain loads and stresses of the design [16]. e limit state method is based on estimations.…”