Effect of uneven porosity distribution in cement paste and mortar on reinforcing steel corrosion

Gu, Ping; Fu, Yan; Xie, Ping; Beaudoin, J.J.

doi:10.1016/0008-8846(94)90029-9

Cited by 7 publications

(2 citation statements)

References 24 publications

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“…If the strength is low (20.7 MPa) carbonation can reach 25 mm in seven years. Strong concrete with a low (W/C) ratio will have a low permeability and be less susceptible to corrosion as mentioned by Gu et al [6]. The occurrence of corrosion of steel bars in concrete bridges can be avoided by investigation into how concrete material and mix variables affect the corrosion behavior of steel bars.…”

Section: Quality Of Concretementioning

confidence: 99%

Corrosion of reinforcing steel in reinforced and prestressed concrete bridges

Hussain¹,

Rifai²

2007

WIT Transactions on Engineering Sciences, Vol 54

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The corrosion of reinforcing steel has led to the premature deterioration of many concrete bridges in countries throughout the World, such as Libya, before their design life is attained. This has placed tremendous financial burden on such countries and local transportation organizations in their attempts to halt ongoing reinforcing steel corrosion in the existing structures that are still functional and to replace those structures that have already deteriorated to the point that it does not make any economic sense to keep on maintaining them. In addition, badly deteriorated bridges have considerable adverse effects on the nation's economic output and also place the safety of motorists at risk. In this study the effects of several factors on the corrosion behavior of steel have been studied. These factors are chloride ion concentrations and environmental variables such as temperature and relative humidity. The interactions of chloride ion concentration, temperature, and relative humidity on the corrosion behavior of steel are complex. In addition, the effect of the concrete mix components, such as water/cement ratio and proper selection of cement type, mineral admixture, and fine aggregate, coarse aggregate, and air content on the corrosion rate of reinforcing steel are studied.

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Section: Quality Of Concretementioning

confidence: 99%

Corrosion of reinforcing steel in reinforced and prestressed concrete bridges

Hussain¹,

Rifai²

2007

WIT Transactions on Engineering Sciences, Vol 54

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“…As porous cementitious materials, pores and cracks in cement paste and mortar specimens are extraordinarily important when considering the steel corrosion. Gu et al [2] studied the effect of uneven porosity distribution on steel corrosion, and concluded that oxygen depletion (cathodic reaction of steel corrosion) was relevant to the pore distribution. Also Claisse et al [3] performed the measurements to concrete samples blended with silica fume using porosity as a predictor of durability and confirmed that the porosity was a super predictor of transport properties of concrete but relatively not that good for steel corrosion.…”

Section: Introductionmentioning

confidence: 99%

Influence of Cover Porosity on Steel Corrosion in Cement-Based Materials

Shi¹,

Sun²

2010

AMR

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A detailed investigation has been carried out to clarify the effect of porosity on steel corrosion in cement-based materials. Corrosion behaviours of steel were studied by means of corrosion potential, linear polarization resistance (LPR) and electrochemical impedance spectroscopy (EIS), while the porosity of cover zone cement-based materials were investigated by evaporative water method (EWM) and mercury intrusion porosimetry (MIP). The results highlight that the corrosion parameters of steel are strongly related with porosity of cement-based materials. A linear relationship between porosity and corrosion rate of steel has been established which is in good agreement with the principle that the diffusion of chloride ions through porous cementitious materials may accelerate the anodic reaction of steel corrosion as well as oxygen diffusion for the cathodic reaction simultaneously.

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