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International Concrete Abstracts Portal

Showing 1-5 of 305 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: 

20-082

Date: 

March 1, 2021

Author(s):

Naga Pavan Vaddey and David Trejo

Publication:

Materials Journal

Volume:

118

Issue:

2

Abstract:

A new method, OCcrit, has been developed at Oregon State University for quantifying critical chloride threshold of steel-cementitious systems. Previous research on this test method focused on identifying a test method for monitoring corrosion initiation and on optimizing criteria for detecting the initiation of steel reinforcement corrosion. This paper reports experimental data used for optimizing various parameters associated with the new test method. The parameters evaluated included water-cementitious materials ratio (w/cm), sand-cement ratio (s/cm), and exposure conditions for the anode specimen. Results indicate that an s/cm of 1.375 is optimal to minimize issues with shrinkage and constructability of the OCcrit anode specimens. Also, results indicate that the optimal conditions for the OCcrit test specimens fabricated with portland cement mortar and conventional steel reinforcement require an exposure solution with a pH of 12.5 and a chloride concentration of 2%, and the anode specimens should be continuously exposed until corrosion initiation. The developed optimal parameters can be used to estimate critical chloride threshold of conventional reinforcement in a practical time frame.

DOI:

10.14359/51731547


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


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