Seismic Response for a Reinforce Concrete Specimen Considering Corrosive Hazards

2015 ◽  
Vol 764-765 ◽  
pp. 1124-1128 ◽  
Author(s):  
Wei Ting Lin ◽  
Yuan Chieh Wu ◽  
An Cheng ◽  
Tzu Ying Lee
Keyword(s):  
Reinforced Concrete ◽  
Dynamic Response ◽  
Seismic Response ◽  
Corrosion Test ◽  
Natural Frequencies ◽  
Response Spectrum ◽  
Open Circuit ◽  
Reinforced Concrete Frame ◽  
Accelerated Corrosion ◽  
Accelerated Corrosion Test

This study is aim to evaluate the dynamic response variation of the scale-down reinforced concrete frame specimen under accelerated corrosion conditions. The specimens achieved the accelerated corrosion test by immersing in the accelerated corrosion test. Open circuit potential, corrosion rate, natural frequencies, displacements, accelerations and response spectral curves were tested and discussed. Test results presented that the corroded reinforced concrete specimens presented the changes in the dynamic response especially natural frequencies and response spectrum. This study provided further insight on the variation of seismic response behaviors in the deteriorated reinforced concrete structures and hoped to useful for structural assessments and appraisals applied to full-scale structures.

scholarly journals Experimental and Empirical Time to Corrosion of Reinforced Concrete Structures under Different Curing Conditions

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Ahmed A. Abouhussien ◽  
Assem A. A. Hassan
Keyword(s):  
Reinforced Concrete ◽  
Corrosion Test ◽  
Concrete Structures ◽  
Reinforced Concrete Structures ◽  
Cell Potential ◽  
Accelerated Corrosion ◽  
Curing Conditions ◽  
Expected Time ◽  
Corrosion Initiation ◽  
Accelerated Corrosion Test

Reinforced concrete structures, especially those in marine environments, are commonly subjected to high concentrations of chlorides, which eventually leads to corrosion of the embedded reinforcing steel. The total time to corrosion of such structures may be divided into three stages: corrosion initiation, cracking, and damage periods. This paper evaluates, both empirically and experimentally, the expected time to corrosion of reinforced concrete structures. The tested reinforced concrete samples were subjected to ten alternative curing techniques, including hot, cold, and normal temperatures, prior to testing. The corrosion initiation, cracking, and damage periods in this investigation were experimentally monitored by an accelerated corrosion test performed on reinforced concrete samples. Alternatively, the corrosion initiation time for counterpart samples was empirically predicted using Fick’s second law of diffusion for comparison. The results showed that the corrosion initiation periods obtained experimentally were comparable to those obtained empirically. The corrosion initiation was found to occur at the first jump of the current measurement in the accelerated corrosion test which matched the half-cell potential reading of around −350 mV.

scholarly journals Influence of Pore Networking and Electric Current Density on the Crack Pattern in Reinforced Concrete Test Due to Pressure Rust Layer at Early Ages of an Accelerated Corrosion Test

2019 ◽  
Author(s):  
Ángela M. Bazán ◽  
Encarnación Reyes ◽  
Jaime C. Gálvez
Keyword(s):  
Reinforced Concrete ◽  
Pore Size ◽  
Electric Current ◽  
Current Density ◽  
Corrosion Test ◽  
Electric Current Density ◽  
Rust Layer ◽  
Porous Network ◽  
Accelerated Corrosion ◽  
Accelerated Corrosion Test

Research on early stages of corrosion of steel bars, together with the formation and development of cracks induced in the surrounding concrete and caused by chloride penetration, is relevant in improving the durability of reinforced concrete structures. This paper uses integration of the analytical models examined in the published literature, combined with experimental research in corrosion induced at the concrete/steel interface, in estimating the time-to-crack initiation of reinforced concrete subjected to corrosion. This work studies the influence of the porous network and electric current density on the cracking process at early ages. The experimental campaign was performed by using an accelerated corrosion test on a conventional concrete (CC) and a concrete with silica fume (SFC) by submitting them to a current density of 50μA/cm2 and 100μA/cm2. Examination performed by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) provided both qualitative and quantitative information on the penetration of the rust layer in the surrounding concrete porous network. Strain gauges were used to measure corrosion-induced deformations between steel and concrete matrices, as well as the formation of corrosion-induced cracks. A good correlation between the rate of penetration of the rust products in the surrounding pores  and the delay of the cracking pressure in concrete was observed from the experimental results. This phenomenon is incorporated into the analytical model by using a reduction factor, which mainly depends on the pore size of the concrete. The crack width obtained exhibited a significant dependency on electric current density at the beginning of the test, depending mainly on the pore size of the concrete later.

scholarly journals Influence of Pore Networking and Electric Current Density on the Crack Pattern in Reinforced Concrete Test Due to Pressure Rust Layer at Early Ages of an Accelerated Corrosion Test

Materials ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2477
Author(s):  
Ángela M. Bazán ◽  
Encarnación Reyes ◽  
Jaime C. Gálvez
Keyword(s):  
Reinforced Concrete ◽  
Pore Size ◽  
Electric Current ◽  
Current Density ◽  
Corrosion Test ◽  
Electric Current Density ◽  
Rust Layer ◽  
Porous Network ◽  
Accelerated Corrosion ◽  
Accelerated Corrosion Test

Research on early stages of corrosion of steel bars caused by chloride penetration is relevant in improving the durability of reinforced concrete structures. Similarly, the formation and development of cracks induced in the surrounding concrete is also of great importance. This paper uses integration of the analytical models examined in the published literature, combined with experimental research in corrosion induced at the concrete/steel interface, in estimating the time-to-crack initiation of reinforced concrete subjected to corrosion. This work studies the influence of the porous network and electric current density on the cracking process at early ages. The experimental program was performed by using an accelerated corrosion test. Two types of concrete were performed: A conventional concrete (CC) and a concrete with silica fume (SFC). A current density of 50 μA/cm2 and 100 μA/cm2 was applied to specimens of both concretes. Examination performed by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) provided both qualitative and quantitative information on the penetration of the rust layer in the surrounding concrete porous network. Strain gauges were used to measure corrosion-induced deformations between steel and concrete matrices, as well as the formation of corrosion-induced cracks. A good correlation between the rate of penetration of the rust products in the surrounding pores and the delay of the cracking pressure in concrete was observed from the experimental results. This phenomenon is incorporated into the analytical model by using a reduction factor, which mainly depends on the pore size of the concrete. The crack width obtained exhibited a significant dependency on electric current density at the beginning of the test, depending mainly on the pore size of the concrete later.

scholarly journals The Study of Half-cell Potential Behaviour of Reinforced Concrete in Marine Environment

2021 ◽  
Vol 9 (VII) ◽  
pp. 128-131
Author(s):  
Shrabanee Giri
Keyword(s):  
Reinforced Concrete ◽  
Marine Environment ◽  
Concrete Structure ◽  
Corrosion Test ◽  
Reinforced Concrete Structure ◽  
Half Cell ◽  
Cell Potential ◽  
Accelerated Corrosion ◽  
Accelerated Corrosion Test ◽  
Potential Test

Corrosion of reinforcement in concrete affects the strength and durability of reinforced concrete structure. Monitoring and maintenance of concrete structure throughout the service life prevent the ingress of corrosion at the initial stage. Half-cell potential meter was developed and fabricated to monitor the corrosion potential of reinforcement in a M25 grade concrete. Half-cell potential test and accelerated corrosion test has been carried out in marine environment of 3.5% of NaCl solution. The potential behaviour of specimen subjected to accelerated corrosion is studied throughout the test period. The results were obtained in terms of current flow behaviour and weight loss. Obtained results has been analyzed graphically and a comparative analysis has been carried out to know the rate of corrosion occurred in the specimen by accelerated corrosion test and half-cell potential test. Obtained results clearly indicates that the potential behaviour value increases with increase in time from 160 mV on day 1 to 949 mV on day 5. In the other way the compressive strength value for corroded specimen is lesser than the controlled specimen subjected to accelerated corrosion.

Experimental Investigation of Corrosion-Induced Cover Cracking in Reinforced Concrete Structures

2011 ◽  
Vol 197-198 ◽  
pp. 1690-1693
Author(s):  
Chun Hua Lu ◽  
Wei Liang Jin ◽  
Jiang Hong Mao
Keyword(s):  
Reinforced Concrete ◽  
Corrosion Test ◽  
Concrete Structures ◽  
Concrete Cover ◽  
Corrosion Products ◽  
Analytical Models ◽  
Reinforced Concrete Structures ◽  
Accelerated Corrosion ◽  
Cover Cracking ◽  
Accelerated Corrosion Test

Concrete cover cracking induced by reinforcement corrosion is an important problem in reinforced concrete structures. Several existing analytical models for cracking time are discussed, and it is found that the penetration of corrosion products into corrosion cracks is neglected in these models. Based on our study, a theoretical model that takes the ingress of rust into cracks into account is proposed to predict the cracking time. In order to analyze the amount of corrosion products deposited in cracks, an accelerated corrosion test was performed. Based on the experimental results, the parameter k, which deal with the ingress of corrosion products into cracks, is calibrated to be 0.1~0.3 for accelerated corrosion test. By comparing the predictions with the test results, it is found that the proposed model has high accuracy in analyzing the cracking time and that the mean absolute error between predictions and observations is about 9.4%.

scholarly journals Vehicle accelerated corrosion test procedures for automotive in Malaysia

2016 ◽  
Vol 90 ◽  
pp. 01040 ◽  
Author(s):  
Liza Anuar ◽  
Astuty Amrin ◽  
Roslina Mohammad ◽  
Ali Ourdjini
Keyword(s):  
Corrosion Test ◽  
Test Procedures ◽  
Accelerated Corrosion ◽  
Accelerated Corrosion Test

Study on Corrosion Damage Rule for Two Type of Aluminum Alloy

2014 ◽  
Vol 599-601 ◽  
pp. 111-113
Author(s):  
Dan Feng Zhang ◽  
Xiao Ming Tan ◽  
Dan Gui Zhang ◽  
Fang Zhang ◽  
Wei Zhang
Keyword(s):  
Aluminum Alloy ◽  
Statistical Analysis ◽  
Marine Environment ◽  
Corrosion Test ◽  
Corrosion Damage ◽  
Aircraft Structure ◽  
Accelerated Corrosion ◽  
Damage Repair ◽  
Accelerated Corrosion Test ◽  
Damage Rule

Corrosion exists everywhere. It’s very widespread that the aluminum alloy aircraft structure suffers the corrosion damage under the marine environment particularly. The equivalent accelerated corrosion test of the new aluminum alloy 2B06 and 7B04 was carried out.Corrosion damage was inspected and measured through microscope. The rule of the corrosion damage can be obtained by statistical analysis. And which can supply the reference basis for the corrosion damage repair and evaluating the calendar life.

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