Probabilistic evaluation of the effect of uniform corrosion parameters on the bond strength between concrete and reinforcement

Q: How can I download an article?

To download an article from SID, first log in to the site, search for the article title, and click on the 'Download Article' option.

Q: How can I download an ISI article?

To download an ISI article on SID, enter the keyword or article title in the search bar, view the relevant results, click on the desired article, and select the 'Download Article' option.

Q: How can I access the SID database?

To access the SID database, visit SID.ir, create an account, and log in to access scientific resources.

Q: Is downloading articles from SID free?

Some articles on SID are available for free, while others require payment. Details are specified on the article's page.

HOSSEINI SEYED ABBAS

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

Journal Paper

Paper Information

Journal: Modares Civil Engineering journal Year:2020 | Volume:20 | Issue:5 Page(s): 63-75

Download Full-Text

Persian Verion

View:

Download:

Cites:

Information Journal Paper

Title

Probabilistic evaluation of the effect of uniform corrosion parameters on the bond strength between concrete and reinforcement

Author(s)

HOSSEINI SEYED ABBAS | Issue Writer Certificate

Keywords

Reinforcement corrosion

bond reduction

probabilistic model

chloride ingress

concrete durability

Abstract

Reinforcement corrosion in concrete structures is considered as one of the main important issues that degrade the durability of RC structures. The concrete environment has a high alkali content (pH = 13) which protects the steel reinforcement against corrosion. Corrosion of steel rebar begins in case of reduced alkalinity of the concrete environment in the presence of moisture and oxygen. One of the most important effects of Reinforcement corrosion is to reduce the bond between concrete and rebar. Chloride and carbonation induced corrosion caused a reduction in reinforcement cross-sectional area, reduction in bond strength, cracking and lamination of concrete cover. Corrosion produces materials that contain more volumes than the materials used in the corrosion process, and this increase in volume causes changes in the bond strength as well as the appearance of cracks. Bond strength enables the force transfer from reinforcing steel bar into concrete and guarantees the composite manner of reinforced concrete structures. The main mechanisms affecting the transfer of forces between rebar and concrete include adhesion, friction, and anchorage bonding. In ribbed bars, the anchorage bond caused by mechanical locking between the concrete and the rebar ribs plays the most important role in bond strength. Many empirical models have been developed to estimate bond strength during the corrosion propagation period. The experimental results are different depending on the test conditions and how to prepare the samples. Models presented by different researchers, even for the same basic assumptions, have fundamental differences in the predicted bond strength, which causes uncertainty in the choice of model and results. In this paper by regression of existing empirical results, some different models are presented for each bar diameter. This study uses laboratory results that have the same initial assumptions,for example, concrete samples having the same dimensions and compressive strength. The reinforcement diameter and corrosion current density are two basic variables in bond degradation models that have been considered for investigation of uncertainty in proposed models. Based on the results, the bond reduction during the corrosion propagation is exponential and the effect of the uncertainty of the corrosion current density is greater than the bar diameter. The effect of uncertainties on the coefficient of variation of the results is more than the effect on the mean. The bond reduction for the smaller diameter bars was lower than the larger bars such that for 10 and 16 mm diameters at 15% corrosion, the bond to primary bond ratio was 0. 46 and 0. 28, respectively. The regression of existing experimental results shows that the uncertainty of the residual bond prediction model is lower for smaller bars. This is due to the effect of the ratio of concrete cover to rebar diameter as the rebar diameter increases. When the same corrosion current is induced inside the bars, because the same mass of the bars is corroded, the corrosion rate of the smaller bars is greater than the larger bars. The standard deviation of the residual bond strength during the corrosion expansion period is almost constant. The coefficient of variation of the bond strength depends on the average bond strength, so this parameter increases over time.

Cites

No record.

References

No record.

Cite

APA: Copy

HOSSEINI, SEYED ABBAS. (2020). Probabilistic evaluation of the effect of uniform corrosion parameters on the bond strength between concrete and reinforcement. MODARES CIVIL ENGINEERING JOURNAL, 20(5 ), 63-75. SID. https://sid.ir/paper/1036895/en

Vancouver: Copy

HOSSEINI SEYED ABBAS. Probabilistic evaluation of the effect of uniform corrosion parameters on the bond strength between concrete and reinforcement. MODARES CIVIL ENGINEERING JOURNAL[Internet]. 2020;20(5 ):63-75. Available from: https://sid.ir/paper/1036895/en

IEEE: Copy

SEYED ABBAS HOSSEINI, “Probabilistic evaluation of the effect of uniform corrosion parameters on the bond strength between concrete and reinforcement,” MODARES CIVIL ENGINEERING JOURNAL, vol. 20, no. 5 , pp. 63–75, 2020, [Online]. Available: https://sid.ir/paper/1036895/en

Related Journal Papers

No record.

Related Seminar Papers

No record.

Related Plans

No record.

Recommended Workshops