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International Concrete Abstracts Portal

The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

Showing 1-5 of 955 Abstracts search results

Document: 

CI4804Yu

Date: 

April 1, 2026

Author(s):

Jun Yu, Kunal Badheka, and David Campos

Publication:

Concrete International

Volume:

48

Issue:

4

Abstract:

The suspended concrete ceiling beneath the Helmsley Building at 230 Park Avenue, Manhattan, New York, NY, USA, was successfully restored after cracking and staining were observed during a façade inspection. This article discusses the repair of the nearly 100-year-old concrete assembly in a highly constrained urban environment.

DOI:

10.14359/51750638

Document: 

CI4804Q&A

Date: 

April 1, 2026

Publication:

Concrete International

Volume:

48

Issue:

4

Abstract:

Chlorides in sufficient amounts contribute to the corrosion of reinforcing steel in concrete. However, there is no singular critical chloride threshold that covers every case. The industry’s understanding of the role of chlorides that may initiate corrosion is evolving. This article discusses various parameters affecting the critical chloride threshold and the sources of uncertainty associated with the concept.

DOI:

10.14359/51750646

Document: 

SP366

Date: 

October 3, 2025

Author(s):

ACI Committee 222

Publication:

Symposium Papers

Volume:

366

Abstract:

Professor Carolyn Hansson’s remarkable journey began in England, during the turbulence of the Second World War. Despite the hardships of wartime and the limitations imposed by rationing, Carolyn was raised in a nurturing environment by parents who instilled in her a deep respect for learning and perseverance. These values would guide her through an exceptional academic and professional life. As the sole woman at the Royal School of Mines, Carolyn studied metallurgy at Imperial College, where she later earned her PhD, focusing on superconductivity and crystal structures at liquid helium temperatures. Her postdoctoral path led her from industrial research at Martin Marietta Laboratories to academic positions at Columbia University and the State University of New York at Stony Brook, and later to Bell Laboratories in 1976. Her pivotal shift into corrosion science began in 1980 at the Danish Corrosion Centre, where she worked on a new type of cement and corrosion of steel in concrete. From Denmark to Canada, Professor Hansson continued her research at Queen’s University and later at the University of Waterloo, building an enduring legacy in the field of steel corrosion in concrete structures. Over the decades, Carolyn’s contributions to corrosion research have shaped and guided generations of engineers and scientists. Her pioneering studies—on electrical resistivity of concrete, quantifying reinforcement corrosion rates, and understanding the complex role of chlorides—remain foundational in the field. Her investigations into corrosion inhibitors, electrochemical chloride extraction, effects of concrete cracking on reinforcement corrosion, and corrosion-resistant steels continue to influence global practices in infrastructure resilience. This Special Publication celebrates more than 60 years of Professor Hansson’s contributions as a scientist, educator, and mentor. The papers collected here, presented at the 2025 Spring Convention in Toronto, reflect not only the lasting relevance of her work but also its future promise. Her vision stands as both a mirror to the past and a beacon for innovations yet to come in corrosion-resistant construction. O. Burkan Isgor David Tepke Ceki Halmen Neal Berke

DOI:

10.14359/51749242

Document: 

SP366_01

Date: 

October 1, 2025

Author(s):

David G. Tepke and O. Burkan Isgor

Publication:

Symposium Papers

Volume:

366

Abstract:

A review of corrosion literature on corrosion of steel in concrete clearly shows that Carolyn Hansson’s work and vision mirrors the exponentially increasing interest on the subject since 1980s. During the time Dr. Hansson has been contributing to the scientific community, significant advancements have occurred in understanding and controlling corrosion of metals in concrete. This paper discusses some of the key advancements over the last six decades as Dr. Hansson was making her mark on the industry. The recognition of the role of corrosive environments, development and roles of committees in providing forums for experts, service-life modeling, electrochemical control, and other topics are discussed. Finally, a perspective on where the industry may be going in the future years is offered.

DOI:

10.14359/51749229

Document: 

SP366_06

Date: 

October 1, 2025

Author(s):

Alberto A. Sagüés and Christopher L. Alexander

Publication:

Symposium Papers

Volume:

366

Abstract:

Corrosion of steel in concrete involves interactions between net anodic and cathodic regions that may extend into the cm, m or multi-m range. Such broad macrocells conveniently help corrosion detection methods based on half-cell potential surveys. However, the macrocells can also complicate the interpretation of polarization measurements of corrosion rates, leading to over or under estimates depending on the chosen placement of the sensor electrodes. Corrosion macrocells can also make interdependent the corrosion initiation and propagation stages of contiguous parts of a structure, by mutually affecting chloride threshold values and corrosion rates. Damage evolution forecasts change considerably when interdependence is taken into consideration, an issue of importance in creating next generation models. This paper addresses understanding by the corrosion in concrete community in a selection of these issues, and anticipates challenges to be resolved next.

DOI:

10.14359/51749234

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