scholarly journals ACCELERATED TEST ON THE RATE OF CORROSION OF REINFORCING BAR IN CONCRETE CONTAINING CHLORIDE ION

2012 ◽  
Vol 77 (681) ◽  
pp. 1613-1622 ◽  
Author(s):  
Masaru KAKEGAWA ◽  
Yoshihiro MASUDA ◽  
Yuji MATSUBAYASHI ◽  
Tadatsugu KAGE
Keyword(s):  
Chloride Ion ◽  
Accelerated Test ◽  
Reinforcing Bar

Probabilistic Analysis of Corrosion-Induced Resistance Degradation of Reinforced Concrete Bridge Beam under Incomplete Information

2010 ◽  
Vol 163-167 ◽  
pp. 3193-3199
Author(s):  
Lei Wang ◽  
Ya Fei Ma ◽  
Jian Ren Zhang
Keyword(s):  
Reinforced Concrete ◽  
Incomplete Information ◽  
Induced Resistance ◽  
Probabilistic Analysis ◽  
Chloride Ion ◽  
Reinforcing Bar ◽  
Reinforced Concrete Bridge ◽  
Structural Resistance ◽  
Resistance Degradation ◽  
The Relationship

The influencing information of structural resistance cannot be exactly inspected due to limitation of the experimental means, time and space. The study must be conducted by incomplete information and the uncertainty is enhanced. The uncertainty consists of fuzziness, randomness, and faultiness of knowledge. The faultiness of knowledge is the weak uncertainty, and can be incorporated into fuzziness and randomness. A novel probabilistic analysis method of corrosion-induced resistance degradation subject to fuzziness and randomness is developed in this paper. The reinforcing bar corrosion is induced by chloride ion attack in reinforced concrete (RC) bridge. The relationship between steel area corrosion rate and yield strength is presented based on the experimental investigation on mechanical property of corroded reinforcement. The fuzzy time-variant probabilistic analysis of resistance degradation is illustrated by an example problem of RC bridge beam. The result can be used to time-variant reliability-based evaluation for reinforced concrete.

ANALYSIS OF DETERIORATION IN REINFORCED CONCRETE BRIDGE GIRDERS DAMAGED BY CHLORIDE DETERIORATION AND FATIGUE

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
H. Honda ◽  
T. Shimozato ◽  
Y. Arizumi
Keyword(s):  
Visual Inspection ◽  
Steel Corrosion ◽  
Chloride Ion ◽  
Reinforcing Bars ◽  
Loading Test ◽  
Reinforcing Bar ◽  
Reinforced Concrete Bridge ◽  
Internal Loss ◽  
Static Loading Test ◽  
Girder Bridge

The subject of this research was a concrete T-girder bridge which had been exposed for 40 years to the sub-tropical archipelago environment off the east coast of Okinawa, with large amounts of windblown salt, high temperatures and high humidity, a harsh environment for salt damage and steel corrosion. It had suffered damage in the forms of 1) concrete spalling due to reinforcing bar corrosion, 2) internal loss of cross section and severance in internal reinforcing bars, and was therefore removed. Various tests and inspections were applied to analyze the state of deterioration of a real salt-damaged bridge, with the aim of providing technical reference material of use in formulating appropriate maintenance management methods. Distant visual inspection was performed prior to removal of the girder. After the removal, close visual inspection and non-distractive inspections were performed. Compressive strength, elastic modulus and chloride ion content of the concrete were measured. Corrosion of reinforcing bar was observed after chipping the concrete. Chloride-induced deterioration inside the concrete and competence of non-destructive inspection for the deterioration were studied. Static loading test and fatigue-test were performed.

scholarly journals An Accelerated Test Method of Simultaneous Carbonation and Chloride Ion Ingress: Durability of Silica Fume Concrete in Severe Environments

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
S. A. Ghahari ◽  
A. M. Ramezanianpour ◽  
A. A. Ramezanianpour ◽  
M. Esmaeili
Keyword(s):  
Silica Fume ◽  
Saline Water ◽  
Chloride Ion ◽  
Total Porosity ◽  
Xrd Analysis ◽  
Surface Resistivity ◽  
Test Method ◽  
Accelerated Test ◽  
Tidal Zone ◽  
Porosity Analysis

The effects of simultaneous carbonation and chloride ion attack on mechanical characteristics and durability of concrete containing silica fume have been investigated through an accelerated test method. Specimens containing different amounts of silica fume were maintained in an apparatus in which carbon dioxide pressure and concentration and relative humidity were kept constant, and wetting and drying cycles in saline water were applied. Surface resistivity, sorptivity, CO2consumption, and carbonation and chloride ion ingress depths measurements were taken. Phase change due to carbonation and chloride ion attack was monitored by XRD analysis, and microstructures and interfacial transition zones were studied by implementing SEM as well as mercury intrusion porosimetry. It was expected to have a synergistic effect in the tidal zone where simultaneous carbonation and chloride ion attack happen. However, the observed reduced surface resistivity, compared to specimens maintained in CO2gas, could be due to the moisture that is available near the surface, hindering CO2from penetrating into the pores of the specimens. Moreover, the porosity analysis of the specimens showed that the sample containing silica fume cured in the tidal zone had 50.1% less total porosity than the plain cement paste cured in the same condition.

scholarly journals EXPERIMENTAL STUDY ON THE RATE OF CORROSION OF REINFORCING BAR IN CONCRETE CONTAINING CHLORIDE ION

1992 ◽  
Vol 435 (0) ◽  
pp. 19-27 ◽  
Author(s):  
Yoshihiro MASUDA ◽  
Hiroshi HANAE ◽  
Yuji MATSUBAYASHI ◽  
Kenji HARA ◽  
Masayuki YASUDA
Keyword(s):  
Experimental Study ◽  
Chloride Ion ◽  
Reinforcing Bar

The Electrochemical Characterization of Rebar Passivation Film in Simulated Concrete Media

2011 ◽  
Vol 255-260 ◽  
pp. 539-545 ◽  
Author(s):  
Wei Zhong Gan ◽  
Wei Liang Jin ◽  
Jian Ping Shao
Keyword(s):  
Concrete Structure ◽  
Chloride Ion ◽  
Dynamic State ◽  
Reinforcing Bar ◽  
Passivation Film ◽  
Active Transition ◽  
Long Term Performance ◽  
Term Performance

Based on the fundamental theory of electrochemical anodic polarization, simulated concrete is doped with corrosion inhibitor to prevent corrosion by chloride ion in the marine environment. Thus, with reference to the potential-time curves obtained in different concrete environments and construction conditions, the early dynamic state of active transition of rebar passive films in concretes can be quickly characterized. According to the experiments, the characteristics of passive active transition are synchronous with rebar corrosion. This helps to systematically study the influence of different components of concrete and external media on the durability of the concrete structure. The strong alkaline environment of the concrete is useful in controlling corrosion rate of reinforcing bar. As one of the additional protective measures of the durability of the concrete structure, corrosion inhibitor’s long-term performance contains uncertainty.

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