Corrosion Impact Analysis on Residual Life of Structure Using Cathodic Technique and Algor Simulation Software

Abstract

Abstract. Damage to the reinforced concrete structure is mainly occurring because of two reasons either due to end of service life or due to load exceeds beyond structural capacity. Along with these two reasons degradation of material property is the one more major factor which causes the risk of failure. A concrete structure constructed in an aqueous environment get exposed to the corrosion process. Consequently, this causes the generation of crack, fragilization, a decrease of bond strength between reinforcement and concrete. All these factors affection static and dynamic behavior of concrete structure reducing the service life of an affected area. Whereas service life carries the major role in the economy of a concrete structure that is why various methods have been developed in the second half of the 20 th century to find out the residual life of the structure. In this proposed work, a non-destructive technique is used to predict the residual life of reinforced concrete beams having different cracking levels, as results of steel reinforcement corrosion, considering the variation produced in the dynamic behavior, through the variation of the first natural vibration frequency. Whereas to accelerate the corrosion process, impress current technique is used in which a current is externally applied to induce corrosion in reinforcement and then crack widths and vibration natural frequencies were measured. A numerical model is proposed with the help of FEM based Auto desk Algor simulation software to predict attack penetration depth. At the end, the paper is concluded by giving an effect of "water to cement ratio" and "cover to diameter ratio" on the initiation and propagation of corrosion and residual life of corroded beam specimen is graphically represented.

State of the Art of Tank Structural Evaluation Review: A Case Study of an Elevated Concrete Water Tank Concerning Crack Initiation

“…Nayak [36] ranks water tanks in their seismic performance using nondestructive testing. They found that the displacement of the water tank was reduced by 4.89%, 88.28%, and 92.89%, respectively, for FRP, damper, and bracing.…”

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

“…The service life of structures carries a major role in the economy of concrete structures, and various studies using different methods have been developed to determine the residual life of the structure [1]. The selection of the right pile type for foundations is one of the primary concerns to evaluating its performance in terms of time, cost and quality.…”

“…Further, improving the design efficiency and changing the traditional methods of pile production are some practical solutions for the reduction of cost in the construction of a superstructure that is about 5% to 20% of the overall project construction cost [2]. However, the degradation of material properties is one factor that causes the risk of failure [1]. This is particularly apparent in structures subjected to aggressive environments, such as piles and wharves, which are constructed in an aqueous environment.…”

“…[16,18] The initiation and propagation phases are the two primary stages that cover the formation of corrosion. During these periods, corrosion causes a reduction in the steel reinforcement area, and affects its dynamics and static behavior or its mechanical behaviour [1]. The initiation phase is the phase from the construction of the structure to the initiation of corrosion.…”

Seismic performance of existing water tank after condition ranking using non-destructive testing

“…Hence, retrofitting of these structures to improve their strength is significant and vital. Numerous techniques have been originated and applied to improve the seismic behavior of these structures (Omidinasab and Shakib 2012;Khan et al 2014;Nayak et al 2018). The main objective of this research is to assess the present condition and rehabilitate the existing damaged ESR.…”