Time Scale of Chloride-Induced Corrosion on Circular Section RC Linked Accelerated Test to Natural Corrosion

Yue Zhang,Mi Zhou,Fangyan Lan,Ke Wang,Shangtong Yang

doi:10.1155/2021/6643650

Abstract

The time scale in accelerated decay is essential for studying the durability of reinforced concrete (RC) structures exposed to the chloride corrosion environment. An accelerated corrosion test (ACT) was carried out on RC specimens were conducted under different chloride concentrations and applied voltages, with the information of steel measured. A novel prediction model of the complete corrosion process is proposed to evaluate the time correlation between accelerated decay and natural corrosion. The corrosion process of RC is divided into two stages: corrosion initial stage and corrosion stage of reinforcement. For the first stage, the coefficient of circular section members is presented. For the second stage, the accelerated factor of the test for the natural environment is proposed based on the Arrhenius-type and Faraday’s law. It is calculated by making regressions among some values of parameters, while moving to natural corrosion are extrapolating. The accelerating effect of applied voltages increases in the low-chloride environment, which is better than that in the high-chloride environment. This study provides calibration of the time scale for laboratory tests to analyze the performance of RC structures after corrosion.

Highlights

Chloride-induced corrosion is the key cause of damage and deterioration of reinforced concrete (RC) structures [1, 2]
Because the specimens were exposed to an aggressive environment for 2 days, the steel slightly corroded. e anode was weighed before and after the test to estimate the mass loss in the first stage. e mass loss of each specimen is presented in Figure 4. e test varied from 0.40% to 0.62% of its original weight, depending on the chloride concentration
Time scale of chloride-induced corrosion on circular section RC linked accelerated test to natural corrosion was studied with different chloride concentrations and different applied voltages

Summary

Introduction

Chloride-induced corrosion is the key cause of damage and deterioration of reinforced concrete (RC) structures [1, 2]. Many research explored the durability and mechanical properties of RC structures based on the accelerated corrosion test (ACT) [3,4,5,6,7,8,9] (see Table 1). It uses electrical energy to promote the chemical reaction, which destroys the electrochemical equilibrium of steel and increases the thermodynamic instability of steel by applying voltage. An electrochemical reactor consists of a steel bar-solution system and a stainless-steel solution system and continuously extracts electrons from one end and deliver them to the other end [7, 8]. Since the electron (e− ) cannot enter the aqueous solution, the electrode reactions occurred at the metal-solution interface, as shown in equations (1) and (2)

Methods

Results

Conclusion