Experimental determination of the effects of steel grade and reinforcement percentage on the behavior of short concrete columns subjected to corrosion

Title: Experimental determination of the effects of steel grade and reinforcement percentage on the behavior of short concrete columns subjected to corrosion
Author(s): M. H. Swellam, S. M. Hilal, H. H. Bahnasawi, M. A. Khafaga
Paper category : conference
Book title: International RILEM Symposium on Concrete Science and Engineering: A Tribute to Arnon Bentur
Editor(s): J. Weiss, K. Kovler, J. Marchand, and S. Mindess
Print-ISBN: None
e-ISBN: 2912143926
Publisher: RILEM Publications SARL
Publication year: 2004
Nb references: 10
Language: English

Abstract: The effects of steel grade and percentage of steel reinforcement on the residual load carrying capacity and load-deformation behavior of short corroded concrete columns were experimentally determined in this study. Columns were subjected to two degrees of corrosion severity. Some columns were subjected to corrosion from one face while others were subjected to corrosion from the four faces simultaneously. Different from regular accelerated corrosion setups, corrosion was induced through an electrical setup where the corrosion rate was kept as low as possible to guarantee cracking and spalling of concrete cover. Three groups of columns were cast in order to determine the effects of the considered variables. Each of these groups consists of three or five square columns with dimensions 200*200*1500 mm. The columns were corroded and the corresponding cracking and spalling were mapped before loading. Each column was loaded to failure and the load-deformation was monitored on the four faces of the column to detect any eccentricity induced by corrosion. Columns reinforced with high tensile steel showed larger reductions in load carrying capacities (between 20% and 40%) when compared to columns reinforced with mild steel (between 17% and 36%) when subjected to corrosion. Also, columns with steel percentage 2.54% showed larger reductions of load carrying capacities (between 26% and 66%) when compared to columns with reinforcement percentage 1.13% (between 20% and 60%). As expected, higher degrees of corrosion showed higher detrimental effect. Also, columns exposed to corrosion from the four faces in this study showed larger reductions in load carrying capacities when compared to columns corroded from one face. Also induced eccentricities due to unsymmetrical corrosion were detected and quantified by monitoring the deformation on each pair of parallel faces for future computer modeling of the column behavior.

Online publication: 2004-03-25
Classification: Corrosion
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143926.063