Quality of steel–concrete interface and corrosion of reinforcing steel

2003 ◽  
Vol 33 (9) ◽  
pp. 1407-1415 ◽  
Author(s):  
T.A Soylev ◽  
R François
2021 ◽  
Author(s):  
Alaka Ghosh

Corrosion of reinforcing steel causes cracking and spalling of concrete structures, reduces the effective cross-sectional area of the reinforcing steel and the concrete simultaneously decreases the bond strength at the steel-concrete interface. The detrimental effect of corrosion on the service life of reinforced concrete structures highlights the need for modeling of bond strength between the corroded steel and the concrete. This research presents a nonlinear finite element model for the bond stress at the steel-concrete interface for both uncorroded and corroded reinforcing steel. The nonlinear finite element program ABAQUS is used for this purpose. The expanded volume of corroded product of reinforcing steel produces radial and hoop stresses which cause longitudinal cracks in the concrete. The increased longitudinal crack width, the loss of effective cross-sectional area of the steel and the concrete is also reduced due to the lubricating effect of flaky corroded layer. This research models the loss of contact pressure and the decrease of friction coefficient with the mass loss of the reinforcing steel. The model analyzes the pullout tests of Amleh (2002) and a good agreement is noted between the analytical and the experimental results. Both in FE analysis and experimental results, the loss of bond capacity is almost linear with mass loss of rebar. FE analysis and experiemental result show that, up to 5% mass loss, the bond capacity loss is moderate, at 10 to 15% mass loss, significant amount of bond capacity is lost and at about 20% mass almost all bond capacity is lost. The model is also validated by analyzing the pullout tests performed by Cabrera and Ghoddoussis (1992) and those by Al-Sulaimani et al.(1990).


2021 ◽  
Author(s):  
Alaka Ghosh

Corrosion of reinforcing steel causes cracking and spalling of concrete structures, reduces the effective cross-sectional area of the reinforcing steel and the concrete simultaneously decreases the bond strength at the steel-concrete interface. The detrimental effect of corrosion on the service life of reinforced concrete structures highlights the need for modeling of bond strength between the corroded steel and the concrete. This research presents a nonlinear finite element model for the bond stress at the steel-concrete interface for both uncorroded and corroded reinforcing steel. The nonlinear finite element program ABAQUS is used for this purpose. The expanded volume of corroded product of reinforcing steel produces radial and hoop stresses which cause longitudinal cracks in the concrete. The increased longitudinal crack width, the loss of effective cross-sectional area of the steel and the concrete is also reduced due to the lubricating effect of flaky corroded layer. This research models the loss of contact pressure and the decrease of friction coefficient with the mass loss of the reinforcing steel. The model analyzes the pullout tests of Amleh (2002) and a good agreement is noted between the analytical and the experimental results. Both in FE analysis and experimental results, the loss of bond capacity is almost linear with mass loss of rebar. FE analysis and experiemental result show that, up to 5% mass loss, the bond capacity loss is moderate, at 10 to 15% mass loss, significant amount of bond capacity is lost and at about 20% mass almost all bond capacity is lost. The model is also validated by analyzing the pullout tests performed by Cabrera and Ghoddoussis (1992) and those by Al-Sulaimani et al.(1990).


2009 ◽  
Vol 30 (3) ◽  
pp. 804-809
Author(s):  
Mamadou Babacar Ndiaye ◽  
Sandrine Bec ◽  
Bernard Coquillet ◽  
Ibrahima Khalil Cisse

2017 ◽  
Author(s):  
Parmo

The city development in Indonesia is more oriented to the overground space and this is because the urban population has increased significantly and it is incomparable with the land available in the cities. The number of high-rise buildings and skyscrapers also marks this phenomenon. However, high-rise buildings and skyscrapers have the potential to be vulnerable to the earthquake hazard in Indonesia particularly those located at the high risk seismic regions. In the design of seismic resistant buildings, there are two important aspects required to be considered, namely strength and ductility. The deformation capability and better innovative reinforcement connection become primary consideration in the design of seismic resistant structures. From the tensile tests of reinforcing steel bars with clamps, it is shown that D13 bars has the yield and ultimate tensile strengths of 270.69 and 351.45 MPa, respectively, with the maximum load of 4,757 kg and the maximum elongation of 40%. As for the D16 bars, the yield and ultimate tensile strengths of 217.80 and 327 605 MPa, respectively, with the maximum load of 6,717 kg and the elongation of 32%. In the study, two pieces of steel clamps were tested, it is found that to obtain better results there is a need to increase the number and improve the quality of material of the steel clamps.


2013 ◽  
Vol 631-632 ◽  
pp. 776-781
Author(s):  
Rui Jin Zhang ◽  
Hui Lin Yang ◽  
Da Yong Ye

This paper deals with the influence of the steel-concrete interface quality on the steel bar corrosion. Electrochemical methods including linear polarization resistance (LPR) and electrochemical impedance spectroscopy (EIS) were comparatively used to monitor the corrosion process of reinforcing steel in cement mortar. Experimental results show that a good quality of steel-concrete interface can significantly delay the corrosion initiation and reduces the corrosion rate. The results highlight the reasonable correlation between the impedance response and the Rp values by LPR method, but the corrosion rates obtained by EIS are lower than those results of LPR.


2006 ◽  
Vol 78 (9) ◽  
pp. 3179-3185 ◽  
Author(s):  
Rong-Gui Du ◽  
Rong-Gang Hu ◽  
Ruo-Shuang Huang ◽  
Chang-Jian Lin

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