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International Concrete Abstracts Portal

Showing 1-5 of 282 Abstracts search results

Document: 

20-383

Date: 

July 1, 2021

Author(s):

Naseeruddin Haris and Sangeeta Gadve

Publication:

Materials Journal

Volume:

118

Issue:

4

Abstract:

Corrosion of reinforcing steel bars in concrete has always been one of the major causes of structural failure. This paper experimentally investigates the effect of corrosion on the mechanical properties of reinforcing bars. In the experiment, an anodic current is impressed at the specific current density to reinforcing bars of various diameters to attain different levels of corrosion. The correlation of actual mass loss with predicted mass loss, as per Faraday’s law, and the equivalent section area loss are reported. Further, the uniaxial tensile test is performed on these corroded specimens to obtain load-displacement relations. Based on the test results, stresses and strains are evaluated for all the specimens, and their responses to induced corrosion are reported. Statistical models are developed for predicting yield stress, ultimate stress, and percentage elongation in reinforcing bars that are exposed to different levels of corrosion.

DOI:

10.14359/51732795


Document: 

D118-M03

Date: 

May 1, 2021

Author(s):

Ki Yong Ann

Publication:

Materials Journal

Volume:

118

Issue:

3

Abstract:

Disc. 117-M59/From the May 2020 ACI Materials Journal, p. 111 Corrosion Resistance on Recycled Aggregate Concrete Incorporating Slag. Paper by Anwar Al-Yaqout, Moetaz El-Hawary, Khallad Nouh, and Pattan Bazienth Khan


Document: 

18-315

Date: 

March 1, 2021

Author(s):

John S. Lawler, Jonah C. Kurth, Stephen M. Garrett, and Paul D. Krauss

Publication:

Materials Journal

Volume:

118

Issue:

2

Abstract:

Reliability-based durability design of reinforced concrete structures requires a probabilistic service life modeling approach. Probabilistic service life modeling of chloride-induced corrosion should consider the statistical distributions of key parameters that influence corrosion initiation and subsequent damage. For typical reinforced concrete structures (such as bridge decks), these are chloride exposure, chloride penetration resistance of the concrete, chloride-induced corrosion threshold, depth of concrete cover, and corrosion propagation time. Assessing the impact of the use of corrosion-resistant reinforcement, such as epoxy-coated reinforcing bars (ECR), is typically performed through a selection of the chloride threshold and/or propagation time. This paper provides recommendations for statistical distributions for the chloride threshold to be used in service life modeling for structures containing carbon steel and ECR based on both experimental work reported in the literature and field investigations of existing structures conducted by the authors.

DOI:

10.14359/51730411


Document: 

20-253

Date: 

March 1, 2021

Author(s):

Goran Adil, Ceki Halmen, George Seegebrecht, and John T. Kevern

Publication:

Materials Journal

Volume:

118

Issue:

2

Abstract:

Corrosion performance of reinforced pervious concrete was evaluated through field and laboratory evaluations. Two reinforced pervious cemetery walls in Chicago, IL, were visually evaluated, and samples were investigated through petrographic examination. Corrosion performance of two-layered concrete samples, with an outer layer of conventional concrete and an inner layer of pervious concrete, was evaluated in the laboratory. Results indicated that pervious concrete around the reinforcement can significantly delay the cracking and spalling of samples compared to conventional concrete. Chloride profiles of samples and instantaneous corrosion rate measurements showed that corrosion of reinforcement embedded in two-layered samples was similar to conventional concrete although two-layered samples provided a longer time to cracking. Laboratory results are in agreement with long service life performance observed in the field and with prior pervious concrete corrosion studies.

DOI:

10.14359/51730514


Document: 

20-249

Date: 

March 1, 2021

Author(s):

C.-G. Cho, K. Y. Ann, H. Kim, W. Hwang, J. Kim, W. J. Cho, and H. S. Jung

Publication:

Materials Journal

Volume:

118

Issue:

2

Abstract:

In this study, chloride mobility after electrochemical treatment in concrete was evaluated. Once a concrete specimen containing three steel reinforcing bars was exposed to 4M NaCl for 365 days, electrochemical chloride extraction was applied to the reinforcing bars for 8 weeks at 750 mA/m2 (0.484 mA/in.2) direct current. To evaluate chloride mobility, chloride concentration at all depths was measured for total, free, and bound ones by chloride profiling. Simultaneously, the corrosion rate and potential were measured during the treatment. The removal efficiency for total chloride was significant, ranging from 26.2 to 70.2% compared to the untreated specimen. Free chlorides were mostly removed from the concrete body except for the nearer surface, and bound chloride concentration was surprisingly reduced to 0.67 to 0.74%, irrespective of the depth. Moreover, the corrosion rate and potential indicated that the risk of corrosion was mitigated. A visual examination for steel reinforcing bars confirmed that rust was dramatically reduced after the treatment.

DOI:

10.14359/51730416


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