Abstract Various non-destructive quantitative techniques based on electrochemical methods for measuring the corrosion rate of steel embedded in concrete have been used. The most important is the linear polarization method. In practice, this method gives lower corrosion rates of steel in concrete due to inclusion of the resistance of the concrete in the measurement. In order to eliminate the resistance of the concrete, a galvanostatic pulse method is used. In this method the current pulse is applied to the steel in concrete and the polarizing potential is sampled after the switching off the pulse. The performance of the galvanostatic pulse technique for monitoring the corrosion of steel in concrete has been assessed by comparing the corrosion rate values obtained by the weight loss method and linear polarization resistance method for steel reinforced in M15, M20, M30 and M35 grade concrete containing 0–5% NaCl. It is found that the galvanostatic pulse technique is able to give reliable corrosion rate values of steel in concrete.
Publisher Summary This chapter presents the key issues of the corrosion of metals in concrete, with emphasis on chloride-induced deterioration, quantitative approaches to forecast corrosion performance, and strategies to improve durability in new construction. Chloride-induced corrosion is widespread and causes severe structural damage throughout the world. Many of the findings, forecasting and control methods described also apply, with appropriate modification, to the problem of carbonation-ind...
Abstract Nucleation of corrosion cracking is analyzed by acoustic emission-simplified Green's functions for moment tensor analysis, by which crack kinematics of locations, types and orientations are quantitatively determined. These kinematical outcomes are obtained as 3D locations and vectors, and thus visualized three-dimensionally by using virtual reality modeling language. The procedure is applied to corrosion cracking in reinforced concrete. To clarify the mechanisms of crack extension due t...
#1H Idrissi(INSA Lyon: Institut national des sciences Appliquées de Lyon)H-Index: 6
#2A. Limam(INSA Lyon: Institut national des sciences Appliquées de Lyon)H-Index: 1
Abstract The durability of reinforced concrete structures becomes a matter of concern, due primarily to the increase of damage by the corrosion of steel reinforcements. This corrosion is not only related to the composition and to the procedure of concrete manufacturing (water/cement, sand/cement, etc.), but also to the aggressive agents as chlorides, carbon dioxide, etc. present in the surrounding medium (Cl − , CO 2 , etc.). It is well known that the first kind of rebar corrosion (chloride) is ...
#2Kate M. Nairn(Monash University, Clayton campus)H-Index: 5
Last. Maria Forsyth(Monash University, Clayton campus)H-Index: 95
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A new approach is presented for the analysis of galvanostatically induced transients allowing for the rapid evaluation of the corrosion activity of steel in concrete. This method of analysis is based on the iterative fitting of a non-exponential model based on a modified KWW (Kohlrausch–Williams–Watt) formalism. This analysis yields values for the parameters related to corrosion such as the concrete resistance, polarisation resistance, interfacial capacitance and β, the non-ideality exponent.
Last. Sebastián Feliu(CSIC: Spanish National Research Council)H-Index: 34
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Abstract Galvanostatically induced potential transients can be used to determine the corrosion rate and double layer capacitance ( C ) of steel in reinforced concrete structures, provided that the steel surface area involved in the measurements is known. An approximate capacitance value, based on previous experience, can also be used to determine polarisation resistance even if the area of the working electrode (WE) is unknown, as in the case of measurements on life-size structures using small c...
AbstractA programmable linear polarisation meter has been developed principally for on site measurement of the corrosion of steel reinforcement in concrete. The special features of this instrument are its programmable potentiostatic mode of operation. a simultaneous 300 Hz ac measurement facility to evaluate the resistance due to the concrete, and an instrument earth connection to maintain a monitoring bar at the same potential as the main reinforcement when they are uncoupled to perform linear ...
Abstract The sensitivity of the time constants describing galvanostatically induced potential-time transients to corrosion rate changes was examined on steel embedded in concrete. While it was noted that the shape of the transients changed significantly with changes in corrosion rate, the decay was not an exponential function which would be expected if it were determined by activation controlled reactions. Indeed the time constants resulting from an assumed exponential decay were insensitive to ...
Abstract The corrosion state of steel bars embedded in concrete specimens prepared with blast furnace cement and with Portland cement blended with fly ash, containing light and ordinary aggregates, was determined both in the atmosphere and in artificial sea water. The techniques used measured polarization resistance ( R p ), corrosion potential, electrical resistivity and polarization curves. The most interesting results were obtained with the measurements of R p , by means of which the corrosio...
Abstract The applicability of the polarization resistance method to microcell and macrocell corrosion (MMC) has been often ignored. To address this research gap, this study investigates corrosion rate measurement by using the polarization resistance method on MMC of reinforced concrete. A modified Stern-Geary equation for MMC is proposed to consider the effects of the macrocell current. The Tafel kinetic parameters and polarization resistance are obtained by conducting potentiodynamic polarizati...
Last. Hui Li(HIT: Harbin Institute of Technology)H-Index: 68
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Optical frequency domain reflectometry (OFDR) optical fiber is characterized to monitor corrosion-induced mortar cracking, including localization and determination of crack initiation time, crack s...
#1Daniyal(AMU: Aligarh Muslim University)H-Index: 3
#2Sabih Akhtar(AMU: Aligarh Muslim University)H-Index: 5
Steel corrosion is the main source of damage and early failure of reinforcement concrete structures that in turns create huge economical loss and creating environmental problems. In the past, several corrosion assessment techniques such as potential measurement, gravimetric weight loss measurement, electrical resistivity measurement, sensors and electrochemical methods for instance potentiodynamic polarization, linear polarization resistance, galvanostatic pulse, and electrochemical impedance ha...
#1Liang Fan(Missouri University of Science and Technology)H-Index: 9
#2Xiao Tan(Stevens Institute of Technology)H-Index: 3
Last. Yi Bao(Stevens Institute of Technology)H-Index: 21
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Abstract Corrosion of steel bars compromises the safety and service life of reinforced concrete structures. This study develops an in-situ corrosion monitoring method for reinforced concrete with a distributed fiber optic sensor through experimentation. Reinforced concrete beams instrumented with distributed fiber optic sensors were prepared. A constant current was impressed to the beams immersed in a NaCl solution for accelerated corrosion. The distributed fiber optic sensor was deployed in a h...
Reinforced concrete structures require continuous monitoring and maintenance to prevent corrosion of the carbon steel reinforcement. In this work, concrete columns with carbon and stainless steel reinforcements were exposed to a real marine environment. In order to monitor the corrosion processes, two types of corrosion probes were embedded in these columns at different height levels. The results from the monitoring of the probes were compared to the actual corrosion damage in the different expo...
#1Aneesh A. Chand(USP: University of the South Pacific)H-Index: 2
#2Kushal A. Prasad(USP: University of the South Pacific)H-Index: 3
Last. Farrah Islam(University of the Sunshine Coast)H-Index: 11
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Reinforced Concrete (RC) is globally used to make the building structure strong and more durable. Civil and structural engineers face major challenges as concrete structures deteriorate and get weaker. Recent development in field of assessing and monitoring the health condition of the building structure have shown that corrosion in concrete reinforcement is the cause of failure. Thus, there lies a better research opportunity in the field of monitoring and assessing health condition of the buildi...
#1Liang Fan(Missouri University of Science and Technology)H-Index: 9
#2Yi Bao(Stevens Institute of Technology)H-Index: 21
Last. Genda Chen(Missouri University of Science and Technology)H-Index: 33
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Abstract Corrosion causes mass loss of steel bars, concrete cracking, and interface degradation in reinforced concrete, highly compromising the safety and durability of civil infrastructure. This research proposes a smart reinforced concrete instrumented with a distributed fiber optic sensor for in-situ monitoring, presents an innovative method to quantify mass loss of steel bar using unique distributed sensor data, and studies corrosion-induced expansion of steel bar in steel fiber reinforced c...
Abstract The corrosion effect on the acoustics and elastics parameters of steel plates corroded are studied by ultrasonic techniques. A new method is developed to measure these parameters as a function of the immersion time in the acid solution HCl (corrosion). Lamb waves (plate driven mechanical waves) were selected to perform the different types of inspection required. Their high level of sensitivity to variations in thickness made it a logical choice to achieve the objectives of this work as ...
