TY - GEN
T1 - Effect of corrosion on the tensile properties of steel bars in cracked HPC containing CNI
AU - Lopez-Calvo, H. Z.
AU - Bremner, T. W.
AU - Thomas, M. D.A.
AU - Montes-Garcia, P.
PY - 2010
Y1 - 2010
N2 - An evaluation of the effects of pitting corrosion on the tensile properties of reinforcing bars embedded in pre-cracked high performance concrete (HPC) containing calcium-nitrite corrosion inhibitor (CNI) was performed. Twenty-seven HPC slabs were prepared at three different w/cm ratios and CNI additions of 0, 12.5, and 25 L/m3. The slabs were pre-cracked at 0.0, 0.25, and 0.50 mm crack widths and exposed to a marine environment. After seven years, the reinforcing bars were retrieved, visually inspected and the deepest pit, D PIT, caused by pitting corrosion was measured. Then, the yield load, PYIELD, ultimate load, PULTIM; and elongation at rupture, δ, were determined. The results show that bars extracted from un-cracked low w/cm concretes containing CNI presented marginally reduction on the tensile properties. Conversely, in bars extracted from pre-cracked specimens, reductions of maximum 18% on the ultimate load and 82% on the elongation, as a consequence of pitting corrosion, were found.
AB - An evaluation of the effects of pitting corrosion on the tensile properties of reinforcing bars embedded in pre-cracked high performance concrete (HPC) containing calcium-nitrite corrosion inhibitor (CNI) was performed. Twenty-seven HPC slabs were prepared at three different w/cm ratios and CNI additions of 0, 12.5, and 25 L/m3. The slabs were pre-cracked at 0.0, 0.25, and 0.50 mm crack widths and exposed to a marine environment. After seven years, the reinforcing bars were retrieved, visually inspected and the deepest pit, D PIT, caused by pitting corrosion was measured. Then, the yield load, PYIELD, ultimate load, PULTIM; and elongation at rupture, δ, were determined. The results show that bars extracted from un-cracked low w/cm concretes containing CNI presented marginally reduction on the tensile properties. Conversely, in bars extracted from pre-cracked specimens, reductions of maximum 18% on the ultimate load and 82% on the elongation, as a consequence of pitting corrosion, were found.
UR - http://www.scopus.com/inward/record.url?scp=84861024356&partnerID=8YFLogxK
U2 - 10.1201/b10552-48
DO - 10.1201/b10552-48
M3 - Contribución a la conferencia
AN - SCOPUS:84861024356
SN - 9780415593175
T3 - Concrete under Severe Conditions: Environment and Loading - Proceedings of the 6th International Conference on Concrete under Severe Conditions, CONSEC'10
SP - 397
EP - 404
BT - Concrete under Severe Conditions
PB - CRC Press
T2 - 6th International Conference on Concrete under Severe Conditions-Environment and Loading, CONSEC'10
Y2 - 7 June 2010 through 9 June 2010
ER -
