scholarly journals Electrochemical Evaluation of Galvanized Steel and AISI 1018 as Reinforcement in a Soil Type MH

2020 ◽  
Vol 5 (3) ◽  
pp. 259-263 ◽  
Author(s):  
Miguel Angel Baltazar-Zamora ◽  
Laura Landa-Ruiz ◽  
Yazmin Rivera ◽  
René Croche
Keyword(s):  
Soil Classification ◽  
Galvanized Steel ◽  
High Plasticity ◽  
Cell Potential ◽  
Linear Polarization Resistance ◽  
Fine Soil ◽  
Corrosion Evaluation ◽  
Steel Bars ◽  
Useful Life ◽  
Electrochemical Evaluation

This work presents the electrochemical evaluation of bars of Galvanized Steel and AISI 1018 with 3/8” and ½” of diameter, this bars are commonly used for the construction of elements based on Soils Mechanically Reinforced (SMR), the bars were buried in a fine soil predominant in the region of Xalapa City, Ver., México, soil classified in the USCS (Unified Soil Classification System) as a high plasticity silt (MH). Corrosion evaluation was conducted by monitoring the corrosion potential Ecorr and corrosion rate, Icorr, using techniques half-cell potential according to the standard ASTM C-876-15 and Linear Polarization Resistance (LPR), respectively. The experimental setup simulates the real conditions when the steel is used as reinforcement in structures of SMR, where they remain buried throughout the useful life of the structure. The results of the first 110 days of exposure show that the Galvanized Steel bars have a better corrosion performance compared to the AISI 1018 steel regardless of their diameter.

scholarly journals Non-Destructive Investigation of a 44-Year-Old RC Structure Exposed to Actual Marine Tidal Environments Using Electrochemical Methods

2021 ◽  
Vol 13 (3) ◽  
Author(s):  
Pinta Astuti ◽  
◽  
Khalilah Kamarulzaman ◽  
Hidenori Hamada ◽  
◽  
...  
Keyword(s):  
Visual Observation ◽  
Concrete Cover ◽  
Patch Repair ◽  
Cell Potential ◽  
Corrosion Condition ◽  
Electrochemical Tests ◽  
Rc Structure ◽  
Steel Bars ◽  
Potential Mapping ◽  
Non Destructive

Investigation of deterioration progress in marine structures without destroying them is crucial as early detection of damage before applying the suitable remedial measures. This study presents a series of non-destructive assessment on a 44-year-old naturally corroded RC structure exposed to marine tidal environments using observation of defective appearances and electrochemical tests. The visual observation was conducted by inspecting the corrosion condition of steel bars, crack patterns, and the spalling of concrete cover. The electrochemical investigations carried out in this research consisted of the half-cell potential mapping, the electrical resistivity of concrete, and the corrosion rate of steel bars. The results revealed that electrochemical test results conducted in this research were in good agreement with the actual deterioration degree checked by defective appearances. The RC structure was categorized as Grade II-1 (first half of the acceleration stage). Based on the deterioration degree, both applications of small direct current to control the potential of steel bars in immunity condition and patch repair method by removing the chloride contaminated concrete were recommended as appropriate repairing strategies, and they could extend the service life the of structure.

Corrosion evaluation of carbon steel bars by magnetic non-destructive method

2022 ◽  
pp. 1-17
Author(s):  
Aldecira G. Diogenes ◽  
Elineudo Pinho de Moura ◽  
André da Silveira Machado ◽  
Lindberg Lima Gonçalves
Keyword(s):  
Carbon Steel ◽  
Corrosion Evaluation ◽  
Steel Bars ◽  
Non Destructive

scholarly journals Electrochemical Evaluation of Embedded Steel Bars in the Various Materials

1990 ◽  
Vol 1 (2) ◽  
pp. 1-13
Author(s):  
Nobuaki Otsuki ◽  
Akio Ikegami ◽  
Tsutomu Fukute ◽  
Kenji Takagi
Keyword(s):  
Steel Bars ◽  
Electrochemical Evaluation

scholarly journals Mineralogical composition and physical characteristics of marly soils from Heraklion Crete

2001 ◽  
Vol 34 (3) ◽  
pp. 851
Author(s):  
Α. ΤΣΙΡΑΜΠΙΔΗΣ ◽  
Θ. ΠΑΠΑΛΙΑΓΚΑΣ
Keyword(s):  
Clay Minerals ◽  
Clay Fraction ◽  
Soil Classification ◽  
Mineralogical Composition ◽  
Liquid Limit ◽  
Silty Clay ◽  
High Plasticity ◽  
Degree Of Consolidation ◽  
Very High

The mainly white-yellow marly soils studied present medium degree of consolidation and induration. The predominant grain size of the non - carbonate constituents is that of silt varying from 34 to 64%. According to the textural classification of soils of the SSDS the samples are mainly silty-clay loams with moisture capacity 30-40%. In the untreated samples in decreasing abundance the following minerals predominate: calcite (31-59%), clay minerals (20-34%) and quartz (12-20%). In the clay fraction (<2μπι) in decreasing abundance the following clay minerals (in discrete and interstratified phases) predominate: illite, smectite and vermiculite. Chlorite and kaolinite are missing. Mineralogically the marly soils are immature, because of the extended presence of Fe-Mg minerals (i.e. amphiboles, pyroxenes and clay minerals). According to the Unified Soil Classification System of the ASTM the studied marly soils mainly belong to the groups MH and CH (inorganic silts and inorganic clays respectively with high plasticity and liquid limit >50%), as well as to the group CL (inorganic clays with low plasticity and liquid limit <50%). The degree of consolidation and induration, as well as of compaction of these soils is medium. They contain significant amounts of discrete or interstratified smectite and mainly present high to very high swelling potential and activity between 0.5 and 2.0. It is concluded that specific precautions must be taken into account, when it is unavoidable the foundation of various constructions on these marly soils, because they swell and shrink extensively.

scholarly journals Monitoring DIAMOND device for corrosion state evaluation of reinforced concrete structures

2018 ◽  
Vol 199 ◽  
pp. 04007 ◽  
Author(s):  
Gabriel Samson ◽  
Fabrice Deby ◽  
Jean-Luc Garciaz ◽  
Jean-Louis Perrin
Keyword(s):  
Reinforced Concrete ◽  
Linear Polarization ◽  
Concrete Structure ◽  
Polarization Resistance ◽  
Reinforced Concrete Structure ◽  
Linear Polarization Resistance ◽  
Corrosion Evaluation ◽  
Ohmic Drop ◽  
Concrete Resistivity ◽  
Corrosion State

The corrosion of steel rebars is a major issue with respect to the durability of reinforced concrete structure. Several corrosion evaluation methods exist: half-cell potential, concrete resistivity or linear polarization resistance (LPR) measurement. However, these techniques are employed at a given moment and are not suitable for continuous corrosion evaluation. This works belongs to the DIAMOND project which aims to produce a new corrosion state measurement monitoring device. The monitoring probe consists on a cylindrical probe. A ring shape counter-electrode CE is plated on the probe side. At the centre of the CE, a reference electrode (RE) is placed for potential measurement. The device is embedded in concrete at 25 mm of the inspected rebar. The instantaneous ohmic drop observed at the beginning of the polarization measurement is only linked with the concrete resistance which depends on concrete cover and resistivity. A numerical model was developed on Comsol® to create abacuses graph that link concrete resistivity and concrete resistance. Thus, the ohmic drop measure at the beginning of the polarization can now be used to determine regularly concrete average resistivity between the monitoring probe and steel rebar. Two other series of abacus graphs are then introduced in order to determine the polarization resistance of the rebar in front of the monitoring probe (the point of interest (PI)). Two monitoring probes were placed in two types of concrete (one sound concrete and one concrete with chloride). Corrosion potential, concrete resistivity and rebar corrosion rate were monitored over around 200 days. The experimental results obtained with the monitoring probe are finally compared to the results obtained with the surface DIAMOND probe (introduced in the ICCRRR 2018 paper “Alternative methodology for linear polarization resistance assessment of reinforced concrete structure [1]”).

Wave amplitude of embedded ultrasonic transducer-based damage monitoring of concrete due to steel bar corrosion

2021 ◽  
pp. 147592172110417
Author(s):  
Shunquan Zhang ◽  
Zijian Jia ◽  
Yuanliang Xiong ◽  
Ruilin Cao ◽  
Yamei Zhang ◽  
...  
Keyword(s):  
Ultrasonic Transducer ◽  
Steel Corrosion ◽  
Galvanic Current ◽  
Cell Potential ◽  
Accelerated Corrosion ◽  
Electrochemical Testing ◽  
Steel Bar ◽  
Steel Bars ◽  
Damage Process ◽  
Corrosion Of Steel

In this research, four embedded ultrasonic piezoelectric transducers were combined to form cross pair and opposite pair monitoring schemes for continuously monitoring the damage to different strength grades of concrete caused by the corrosion of reinforcements under accelerated corrosion conditions. The damage process was analyzed by combining the electrochemical effects of steel corrosion, that is, half-cell potential and galvanic current tests. Results show that the embedded ultrasonic transducer method can detect damage of concrete during steel corrosion and that each stage of damage can be determined from the plots of ultrasonic transducer data versus corrosion rate. The results further indicate that a combination of cross pair and opposite pair testing methods can more comprehensively reflect the damage to concrete caused by the expansion of corrosion of steel bars, than a single testing method. Since electrochemical testing can only depict the corrosion state of steel rebars, it is beneficial to use embedded ultrasonic measurements to monitor the damage process of concrete. The differences in damage between different strength grades of concrete, that is, the resistance to corrosion of steel bars and brittle failure, can be obtained from the plots of ultrasonic transducer data.

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