Author
L. Abosrra
Bio: L. Abosrra is an academic researcher from University of Bradford. The author has contributed to research in topics: Corrosion & Bond strength. The author has an hindex of 3, co-authored 3 publications receiving 142 citations.
Papers
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TL;DR: In this paper, reinforced concrete specimens were immersed in a 3% NaCl solution by weight for 1, 7 and 15 days, and the corrosion rate was measured by retrieving electrochemical information of polarization technique.
137 citations
TL;DR: In this article, the corrosion behavior of mild steel and 316L austenitic stainless steel was investigated in a saline solution containing 1 and 3% NaCl, with surface roughness of 200, 600 grit emery paper and 1μm diamond paste.
Abstract: The corrosion behaviour of mild steel and 316L austenitic stainless steel was investigated in saline solution containing 1 and 3%NaCl. Specimens with surface roughness of 200, 600 grit emery paper and 1μm diamond paste were investigated. The anodic polarization measurement technique was performed at a scan rate of 1mV/s for a fixed period of 1 hour. The experimental results revealed that chloride ions have a significant effect on the corrosion behaviour of both steels as expected. As the surface roughness of 316L stainless steel increased, the breakdown potential (Ebreak), the free corrosion potential (Ecorr) and the width of passivity decreased, hence the corrosion rate increased. However, in the case of mild steel specimens, improving surface finish lead to shifts in the corrosion potential to more noble states and increased the corrosion rate. Metallographic examination of corroded specimens after electrochemical corrosion tests confirmed that the breakdown of the passive region was due to pitting corrosion.
28 citations
TL;DR: In this article, the corrosion of steel bars embedded in concrete with 0, 2% and 4% calcium nitrite (CN) having compressive strengths of 20 and 46 MPa was investigated.
Abstract: Corrosion of steel bars embedded in concrete admixed with 0%, 2% and 4% calcium nitrite (CN), having compressive strengths of 20 and 46 MPa was investigated. Reinforced concrete specimens were immersed in 3% NaCl solutions for 1, 7 and 15 days where 0.4A external current was applied to accelerate the chemical reactions. Corrosion rate was measured by retrieving electrochemical data via potentiodynamic polarization technique. Pull-out tests of reinforced concrete specimens were then conducted to assess the corroded steel-concrete bond characteristics. Experimental results showed that corrosion rate of steel bars and steel-concrete bond strength were dependent on concrete strength, amount of CN added and accelerated corrosion period. As concrete strength increased from 20 to 46 MPa, corrosion rate of embedded steel decreased. The addition of 2% CN to concrete of 20 MPa was not effective in retarding corrosion of steel at long time of exposure. However, the combination of higher strength concrete and 2% or 4% CN appear to be a desirable approach to reduce the effect of chloride-induced corrosion of steel reinforcement. After 1 day of corrosion acceleration, specimens without CN showed higher bond strength in both concrete mixes than those with CN. After 7 and 15 days of exposure, the higher concentration of CN, the higher bond strength in both concrete mixes achieved, except for the concrete specimen of 20 MPa compressive strength with 2% CN that recorded the highest deterioration in bond strength at 15 days of exposure.
19 citations
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TL;DR: In this paper, the relationship between the depth of concrete carbonation and CO 2 concentration was investigated through the scanning electron microscopy (SEM) observations, which showed that carbonation decreased the porosity of concrete by clogging up the pores and reducing the pore sizes.
142 citations
TL;DR: In this paper, a new model for the bond-slip relationship between steel bars and concrete involving steel corrosion factor is proposed by modifying a recently developed unified bond slip model, which is used in the modeling: the degradation of bond is caused by material degradation which can be modeled as degradation of concrete strength, and the degradation in confinement is taken into account in the concrete cover effect.
115 citations
TL;DR: In this paper, the local bond-slip curve between the steel and concrete, in the presence of a short embedment length between the two materials, has been obtained and the results show the influence of the corrosion level and presence of confinement in terms of the bond−slip response.
107 citations
TL;DR: Different sensors used for determination of strain, acceleration and corrosion, including Multiplexed Fiber optics sensor, have proved quite effective for SHM and proved to be a good competitor with other sensors.
86 citations
TL;DR: In this article, the authors investigated the differences of bond characteristics in reinforced concrete (RC) members corroded by artificial rapid and natural corrosion methods and found that the failure pattern and critical corrosion level at which the bond capacity failed, varied depending on the RC corrosion method.
79 citations