Embedded Sensor for Detecting Corrosion of Reinforcement in Concrete

2011 ◽  
Vol 250-253 ◽  
pp. 1118-1123 ◽  
Author(s):  
Mohammad Ismail ◽  
A.R. Siti Fatimah ◽  
Bala Muhammad ◽  
Noor Norhazilan Md. ◽  
Hazri Bakhtiar
Keyword(s):  
Corrosion Potential ◽  
Concrete Slab ◽  
Concrete Cover ◽  
Embedded Sensors ◽  
Reinforcement Corrosion ◽  
Nacl Solution ◽  
Half Cell ◽  
Corrosion Sensor ◽  
Steel Bars ◽  
Calibration Purpose

Corrosion of reinforcement is a worldwide problem which causes premature degradations in reinforced concrete structures. Monitoring reinforcement corrosion in concrete can be achieved by embedding corrosion sensor within the concrete cover. In this research, capacitance-based embedded sensor was developed to monitor corrosion potential (Ecorr) and corrosion rate (Icorr) parameters of reinforcement continuously. The sensors were tied to the reinforcement and embedded in concrete slab specimens followed by immersion into NaCl solution for 70 days. During this period, corrosion parameters were weekly recorded. At the same time, half-cell corrosion testing using Portable SRI-CMIII was conducted for calibration purpose. From the research, it was observed that the patterns ofEcorrandIcorrshown by the embedded sensors were similar to that of portable SRI-CMIII device - an indication of suitability of the embedded sensor towards sensing existing corrosion activities around the embedded steel bars. Eventually, the bars were found corroded from the broken specimens to confirm the detection of corrosion activities as recorded by the sensors.

scholarly journals Effects of the zinc and zinc-nickel alloys electroplating on the corrodibility of reinforced concrete rebars

2016 ◽  
Vol 9 (4) ◽  
pp. 595-605 ◽  
Author(s):  
F. A. CEDRIM ◽  
V. L. S. ALMEIDA ◽  
C. A. C. SOUZA ◽  
M. D. JESUS ◽  
D. V. RIBEIRO
Keyword(s):  
Reinforced Concrete ◽  
Nickel Alloys ◽  
Corrosion Potential ◽  
Salt Spray ◽  
Chloride Ions ◽  
Nacl Solution ◽  
Steel Bars ◽  
Quantitative Analyses ◽  
Electroplating Process ◽  
Zinc Nickel

Abstract This paper shows the analysis performed on the corrosion parameters of three groups of reinforcing steel bars, two of these coated by electroplating process with Zinc (Zn) and Zinc-Nickel (Zn-Ni), and the other without any coating. It was used reinforced concrete specimens, which ones were grouped and then subjected to two different corrosion accelerating methods: aging wetting/drying cycles and salt spray exposure. Corrosion potential was measured to qualitative monitoring of the process and, after the end of the tests, corrosion rate was estimated by measuring the mass loss, to quantitative analyses. As it was expected, coated bars presented a better performance than the average bars regarding the corrosion resistance in chloride ions containing environments. It was also observed that the drying/ NaCl solution wetting cycles seems to be more severe than salt spray fog apparatus with respect to the acceleration of corrosion process.

The Impact of Concrete Cover Thickness and Chemical Alkalinity on Reinforcement Corrosion

2014 ◽  
Vol 1065-1069 ◽  
pp. 1957-1963
Author(s):  
Xiu Jing Zhou ◽  
Jia Ming Shu ◽  
Ji Dong Zhang ◽  
Yong Xian Yan ◽  
Wei Zhong Gan
Keyword(s):  
Corrosion Potential ◽  
Concrete Cover ◽  
Experimental Measurements ◽  
Reinforcement Corrosion ◽  
Atmospheric Conditions ◽  
Alkali Aggregate Reaction ◽  
Structural Durability ◽  
Cover Thickness ◽  
Standard Limit ◽  
The Impact

Based on the mechanism of reinforcement corrosion in concrete structures and the experimental measurements of corrosion potential and resistance, this paper investigates the impact of concrete cover thickness and chemical alkalinity on reinforcement corrosion. Experimental results show that the rate of reinforcement corrosion decreases as the thickness of concrete cover of reinforcement increases. Moreover, given no risk of alkali-aggregate reaction, raising the chemical alkalinity of concrete cover helps maintain passivation of reinforcement. Additionally, under general atmospheric conditions, cracks that are not along bars barely affect structural durability if the width of cracks is smaller than its standard limit.

scholarly journals Influence of the void ratio of cellular concrete on the corrosion of steel reinforcement

2022 ◽  
Vol 12 (1) ◽  
pp. 76-97
Author(s):  
Carlos Fernando Gomes do Nascimento ◽  
Alexandre De Azevedo Demétrio Filho ◽  
Thaís Marques da Silva ◽  
Eliana Cristina Barreto Monteiro
Keyword(s):  
Electrical Resistivity ◽  
Mass Loss ◽  
Visual Inspection ◽  
Void Ratio ◽  
Corrosion Potential ◽  
Reinforcement Corrosion ◽  
Air Content ◽  
Steel Bars ◽  
Corrosion Of Steel ◽  
Cellular Concrete

The objective of this study was to understand whether voids intensify the triggering of reinforcement corrosion in cellular concrete, for slabs with light specific masses. The methodology was based on four tests: visual inspection, corrosion potential, electrical resistivity, and mass loss. In relation to the L1 family, the L2 and L3 families (higher air content) were shown to be more susceptible to reinforcement corrosion and mass loss from the steel bars in 90% of cases. However, the behavior of some slabs indicates the possibility of the process being asymptomatic with regard to staining, considering that the influence of the cover on the corrosion of the steel bars was verified

Research on Chloride Appropriate Dosage for Incorporated Accelerated Corrosion

2014 ◽  
Vol 989-994 ◽  
pp. 458-461
Author(s):  
Qi Xia Liu ◽  
Shu Lin Zhan
Keyword(s):  
Compressive Strength ◽  
Corrosion Potential ◽  
Potential Method ◽  
Polarization Potential ◽  
Half Cell ◽  
Cell Potential ◽  
Accelerated Corrosion ◽  
Steel Bars ◽  
Corrosion State ◽  
Potential Curves

Mixing chlorine is one of the ways to ensure the theory and practical steel bars corrosion rate closer when mixing concrete for laboratory electrochemical accelerated corrosion and appropriate chloride dosage should guarantee the steel bars are in the critical corrosion state when we start to accelerated corrosion. By comparing the specimens’ experimental compressive strength, chloride-permeation resistance, corrosion potential measured by the half-cell potential method and polarization potential curves measured by the linear polarization potential method with different Nacl dosage, we get the appropriate Nacl dosage is nearly 1.90%, namely cl- content is about 1.15%.

Detection and Inhibition of Refractory Steel Corrosion by Rhodamine-Based Compound

2013 ◽  
Vol 864-867 ◽  
pp. 672-676
Author(s):  
Li Zhang ◽  
Da Quan Zhang ◽  
Yu Meng ◽  
Li Xin Gao
Keyword(s):  
Corrosion Potential ◽  
Fluorescence Emission ◽  
Steel Corrosion ◽  
Nacl Solution ◽  
Fluorescent Compound ◽  
Inhibition Effect ◽  
Refractory Steel ◽  
Turn On ◽  
Corrosion Reaction ◽  
And Shifts

A rhodamine-based fluorescent compound, spiro[1H-isoindole-1,9′-[9H]xanthen] -3(2H)-one, ′,6′-bis(diethylamino)-2-[(1-methylethylidene)-amino] (RB1), is developed to detect and inhibit the refractory steel corrosion in 3% NaCl solution. The inhibition effect was evaluated by electrochemical measurements. RB1 suppresses the cathodic corrosion reaction and shifts the corrosion potential toward more negative values. RB1 exhibits a turn-on fluorescence emission in the presence of Fe 3+ ions. The selectivity of RB1 over other commonly coexistent Cu2+, Fe 2+ and Mn2+ was investigated. The variation of the fluorescence intensity is correlated to that of weight-loss. RB1 has a potential application as corrosion inhibitor and corrosion indicator in some industry process.

scholarly journals Inclusion of CFRP-Epoxy Composite for End Anchorage in NSM-Epoxy Strengthened Beams

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Md. Akter Hosen ◽  
Mohd Zamin Jumaat ◽  
A. B. M. Saiful Islam
Keyword(s):  
Reinforced Concrete ◽  
Failure Modes ◽  
Concrete Cover ◽  
Structural Members ◽  
Premature Failure ◽  
Near Surface ◽  
Steel Bars ◽  
Near Surface Mounted ◽  
Separation Failure ◽  
Concrete Cover Separation

Nowadays, the use of near surface mounted (NSM) technique strengthening reinforced concrete (RC) structural members is going very popular. The failure modes of NSM strengthened reinforced concrete (RC) beams have been shown to be largely due to premature failure such as concrete cover separation. In this study, CFRP U-wrap end anchorage with CFRP fabrics was used to eliminate the concrete cover separation failure. A total of eight RC rectangular beam specimens of 125 mm width, 250 mm depth, and 2300 mm length were tested. One specimen was kept unstrengthened as a reference; three specimens were strengthened with NSM steel bars and the remaining four specimens were strengthened with NSM steel bars together with the U-wrap end anchorage. The experimental results showed that wrapped strengthened beams had higher flexural strength and superior ductility performance. The results also show that these beams had less deflection, strain, crack width, and spacing.

scholarly journals Experimental Assessment of Rebar Corrosion in Concrete Slab Using Ground Penetrating Radar (GPR)

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Ahmad Zaki ◽  
Megat Azmi Megat Johari ◽  
Wan Muhd Aminuddin Wan Hussin ◽  
Yessi Jusman
Keyword(s):  
Ground Penetrating Radar ◽  
Structural Damage ◽  
Concrete Slab ◽  
Steel Corrosion ◽  
Steel Reinforcement ◽  
Reinforcement Corrosion ◽  
Dc Power ◽  
Reinforcement Bar ◽  
Ground Penetrating ◽  
Corrosion Of Steel

Corrosion of steel reinforcement is a major cause of structural damage that requires repair or replacement. Early detection of steel corrosion can limit the extent of necessary repairs or replacements and costs associated with the rehabilitation works. The ground penetrating radar (GPR) method has been found to be a useful method for evaluating reinforcement corrosion in existing concrete structures. In this paper, GPR was utilized to assess corrosion of steel reinforcement in a concrete slab. A technique for accelerating reinforcement bar corrosion using direct current (DC) power supply with 5% sodium chloride (NaCl) solution was used to induce corrosion to embedded reinforcement bars (rebars) in this concrete slab. A 2 GHz GPR was used to assess the corrosion of the rebars. The analysis of the results of the GPR data obtained shows that corrosion of the rebars could be effectively localized and assessed.

Analysis of Crack Patterns of 500MPa Reinforced Concrete Beams

2013 ◽  
Vol 790 ◽  
pp. 120-124
Author(s):  
Zhi Hua Li ◽  
Xiao Zu Su
Keyword(s):  
Static Loading ◽  
Crack Width ◽  
Concrete Beams ◽  
Concrete Cover ◽  
Reinforced Concrete Beams ◽  
Crack Control ◽  
Crack Patterns ◽  
Beam Depth ◽  
Steel Bars ◽  
Constant Moment

Fourting concrete beams reinforced with 500MPa longitudinal steel bars, of which 6 with skin reinforcement and 8 without skin reinforcement, were tested under two-point symmetrical concentrated static loading to investigate their crack patterns. Crack distributions in constant moment region of beams are compared. The propagation of side cracks along the beam depth is obtained. The results of this study indicate that the concrete cover of longitudinal tensile steel bars and the spacing of skin reinforcement has significant effect on crack distributions; substantial crack control in beams can be achieved if the spacing of skin reinforcement is limited to certain critical values. The curve of d-w(d is the distance between observation points of side cracks and tension face of beams, w refers to crack width at observation points) is approximately characterized by a zig-zag shape and concave-left near longitudinal tensile steel bars.

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