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Reliability of electrochemical corrosion rate measurements of steel in cracked concrete specimens
The paper discusses the reliability of galvanic current and linear polarisation measurements for determining corrosion rates of steel in cracked concrete specimens. The work forms part of a much larger study on minimising the risk of crack-induced reinforcement corrosion. Six replicate sets of concrete beams containing 0, 1, 4, 8, 12, 16 or 20 parallel sided cracks of equal width giving in each case a sum of total width of 2.4 mm, were used. Each beam was reinforced with a central stainless steel and two mild steel bars. Corrosion was initiated by spraying the beams with a chloride solution. The weight loss due to corrosion occuring on the mild steel bars was monitored over a two year period using various electrochemical techniques including Zero Resistance Ammeter (ZRA) and Linear Polarisation Resistance (LPR). The results were compared with gravimetric weight loss measurements on some mild steel bars removed from the beams at the end of the test period. They show that, on average, weight loss were approximately 25% less using LPR and approximately 60% less using ZRA when compared with gravimetric measurements. Nevertheless, the weight losses determined by electrochemical methods correlated well with each other and provided a valuable insight into the mechanism of crack-induced corrosion.
Reliability of electrochemical corrosion rate measurements of steel in cracked concrete specimens
The paper discusses the reliability of galvanic current and linear polarisation measurements for determining corrosion rates of steel in cracked concrete specimens. The work forms part of a much larger study on minimising the risk of crack-induced reinforcement corrosion. Six replicate sets of concrete beams containing 0, 1, 4, 8, 12, 16 or 20 parallel sided cracks of equal width giving in each case a sum of total width of 2.4 mm, were used. Each beam was reinforced with a central stainless steel and two mild steel bars. Corrosion was initiated by spraying the beams with a chloride solution. The weight loss due to corrosion occuring on the mild steel bars was monitored over a two year period using various electrochemical techniques including Zero Resistance Ammeter (ZRA) and Linear Polarisation Resistance (LPR). The results were compared with gravimetric weight loss measurements on some mild steel bars removed from the beams at the end of the test period. They show that, on average, weight loss were approximately 25% less using LPR and approximately 60% less using ZRA when compared with gravimetric measurements. Nevertheless, the weight losses determined by electrochemical methods correlated well with each other and provided a valuable insight into the mechanism of crack-induced corrosion.
Reliability of electrochemical corrosion rate measurements of steel in cracked concrete specimens
Ofori-Darko, F.K. (author) / Arya, C. (author)
2000
8 Seiten, 6 Bilder, 1 Tabelle, 7 Quellen
Conference paper
English
Permeability of cracked concrete specimens
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