Steel reinforcement corrosion detection with coaxial cable sensors

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.

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The Effect of Freeze-Thaw Damage on Corrosion in Reinforced Concrete

Advances in Materials Science and Engineering ◽

10.1155/2021/9924869 ◽

2021 ◽

Vol 2021 ◽

pp. 1-13

Author(s):

Xiao-Chun Lu ◽

Bin Guan ◽

Bo-Fu Chen ◽

Xin Zhang ◽

Bo-bo Xiong

Keyword(s):

Reinforced Concrete ◽

Corrosion Rate ◽

Sem Analysis ◽

Steel Reinforcement ◽

Reinforcement Corrosion ◽

Freeze Thaw ◽

Pull Out ◽

Thaw Cycle ◽

Corrosion Reaction ◽

Freeze Thaw Cycle

The existing studies of the corrosion of reinforced concrete have mainly focused on the interface area and chemical ion erosion, ignoring the specific service environment of the reinforced concrete. In this study, the effect of freeze-thaw damage was investigated via corrosion experiments under different freeze-thaw cycle conditions. Steel reinforcement corrosion mass, ultimate pull-out force, corrosion rate, and bond slippage were chosen as characteristic parameters in the experiments, and scanning electron microscopy (SEM) analysis was used to explain the mechanism of action of freeze-thaw damage on corrosion. The results showed that, under identical corrosion conditions, the mass of steel reinforcement corrosion and corrosion rate increased by 39.6% and 39.7% when comparing 200 freeze-thaw cycles to 0 cycles, respectively. The ultimate pull-out force and bond slippage after 200 freeze-thaw cycles decreased by 73% and 31%, respectively, compared with 0 freeze-thaw cycles. In addition, SEM analysis indicated that microstructure damage caused by freeze-thaw cycles accelerated the corrosion reaction and decreased cementitious properties, leading to decreasing ultimate pull-out force and bond slippage. The effect of freeze-thaw cycles and steel reinforcement corrosion on the macro mechanical properties of concrete is not a simple superposition.

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Steel Reinforcement Corrosion - Its Impact on Features of Steel PSC Strand

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.868.57 ◽

2020 ◽

Vol 868 ◽

pp. 57-64

Author(s):

Vítězslav Vacek ◽

Jiří Kolisko ◽

Petr Pokorný ◽

Michaela Kostelecká

Keyword(s):

Maraging Steel ◽

Prestressed Concrete ◽

Mechanical Characteristics ◽

Concrete Structures ◽

Steel Reinforcement ◽

Reinforcement Corrosion ◽

Anticorrosion Protection ◽

Long Time ◽

Prestressed Reinforcement ◽

Prestressed Structures

Steel reinforcement made of refined maraging steel in the form of wires and strands has been for a long time used commonly for reinforcement of prestressed concrete structures. Defects on some of them and unfortunately even accidents of some cases of bridge objects, mainly recently published by media, related to corrosion of prestressed reinforcement awoke interest of both professional and wide non-professional public related to its durability. This issue also opens up a question of durability and liability of prestressed structures. In majority of existing prestressed structures the anticorrosion protection of reinforcement was traditionally secured mainly by alkalinity of the environment, i.e. concreting and/or grouting of prestressed elements in ducts. The abstract presents information related mainly to mechanical characteristics of corrosion-affected prestressed elements.

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Prevention of Reinforcement Corrosion in Concrete by Sodium Lauryl Sulphate: Electrochemical and Gravimetric Investigations

International Journal of Corrosion ◽

10.1155/2018/9471694 ◽

2018 ◽

Vol 2018 ◽

pp. 1-10 ◽

Cited By ~ 1

Author(s):

Binsi M. Paulson ◽

Thomas K. Joby ◽

Vinod P. Raphael ◽

K. S. Shaju

Keyword(s):

Corrosion Inhibition ◽

Electrochemical Impedance ◽

Electrochemical Techniques ◽

Gravimetric Method ◽

Steel Reinforcement ◽

Sodium Lauryl Sulphate ◽

Reinforcement Corrosion ◽

Cell Potential ◽

Inhibition Response ◽

Ir Spectroscopic

Prolonged corrosion inhibition response of sodium lauryl sulphate (SLS) on steel reinforcement in contaminated concrete was investigated by gravimetric method and electrochemical techniques such as potentiodynamic polarization and electrochemical impedance spectroscopy. Using half cell potential measurements probability of steel reinforcement corrosion was monitored for a period of 480 days. FT-IR spectroscopic analysis of the corroded products deposited on the steel reinforcement revealed the mechanism of corrosion inhibition. Modification in the surface morphology of steel specimens in the concrete was examined by optical microscopy. During the period of investigation (480 days), SLS showed appreciable corrosion inhibition efficiency on the steel reinforcement in concrete.

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Enhancement of alkali-activated slag cement concretes crack resistance for mitigation of steel reinforcement corrosion

E3S Web of Conferences ◽

10.1051/e3sconf/202016606001 ◽

2020 ◽

Vol 166 ◽

pp. 06001

Author(s):

Pavlo Krivenko ◽

Oleh Petropavlovskyi ◽

Oleksandr Kovalchuk ◽

Igor Rudenko ◽

Oleksandr Konstantynovskyi

Keyword(s):

Crack Resistance ◽

Structure Formation ◽

Water Glass ◽

Sodium Metasilicate ◽

Steel Reinforcement ◽

Reinforcement Corrosion ◽

Slag Cement ◽

Alkali Activated Slag ◽

Activated Slag ◽

Alkali Activated

The paper is devoted to mitigation of steel reinforcement corrosion in alkali-activated slag cement (further, AASC) concretes, based on soluble sodium silicates (further, SSS’s), obtained from high consistensy concrete mixes. Enhancement of AASC fine concretes crack resistance due to modification by complex shrinkage-reducing additives (further, SRA’s) based on surfactants and trisodium phosphate Na3PO .12H2O (further, TSP) was proposed for mitigation of steel reinforcement corrosion. SSS’s were presented by sodium metasilicate (silica modulus 1.0, dry state) and water glass (silica modulus 2.9, density 1400 kg/m3). In case of sodium metasilicate the application of SRA composition “ordinary portland cement clinker – TSP – sodium lignosulphonate – sodium gluconate” provides enhancement of crack resistance starting from early age structure formation with restriction of drying shrinkage from 0,984 to 0,713 mm/m after 80 d. The effect is caused by reduction of water and by higher volume of crystalline hydrates. In turn, SRA presented by compositions “TSP – glycerol” and “TSP – glycerol – polyacrylamide” provide enhancement of AASC fine concretes fracture toughness during late structure formation with increasing ratio of tensile strength in bending to compressive strength up to 37 – 49 % if compare with the reference AASC when water glass is used.

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DEVELOPMENT OF EMBEDDED MINI-SENSOR FOR DIAGNOSIS OF CORROSION OF STEEL REINFORCEMENT IN CONCRETE NONDESTRUCTIVELY

Proceedings of International Structural Engineering and Construction ◽

10.14455/isec.res.2016.155 ◽

2016 ◽

Vol 3 (2) ◽

Author(s):

Mohamed A. Ismail ◽

Han-Seung Lee ◽

Mohd Warid Hussin

Keyword(s):

Reinforced Concrete ◽

Polarization Resistance ◽

Concrete Structures ◽

Steel Reinforcement ◽

Reinforced Concrete Structures ◽

Chloride Ingress ◽

Reinforcement Corrosion ◽

Maintenance And Rehabilitation ◽

Corrosion Of Steel ◽

Non Destructive

Corrosion of steel reinforcement embedded in concrete is one of the main causes of degradation of reinforced concrete structures. Degradation occurs in reinforced concrete structures from corrosion caused by the Chloride ingress into concrete. That degradation has a severe impact on the structure in terms of maintenance and rehabilitation costs. Therefore, early detection of reinforcement corrosion is important for efficient maintenance, repair and planning. Meanwhile, the evaluation of the corrosion of reinforcement by non-destructive measurements have been used a lot. In particular CM-II (corrosion meter) is used to measure the polarization resistance, but has some disadvantages. Embedded mini-sensor has been developed in order to overcome these disadvantages. In this study, measurement of corrosion by using the mini-sensor is compared with the measured results by CM-II to verify the validity of the newly developed mini senor. Results show that there are agreement in trends of the parameters measured and as such the developed mini sensor has a promising start to be used.

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