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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 1021 Abstracts search results

Document: 

CI4807Khan

Date: 

July 1, 2026

Author(s):

Mohammad S. Khan

Publication:

Concrete International

Volume:

48

Issue:

7

Abstract:

Built in 1964, the John Coffee Memorial Bridge is a two-lane, 38-span, plate-girder bridge with a concrete deck that provides a direct route for travelers from Tennessee to Mississippi. Because of its scale, inspection is challenging. A recent evaluation was conducted to select appropriate restoration methods, using robotic tools that enabled nondestructive evaluations (NDEs) without the need for traffic control. This article describes these tools and summarizes the evaluation.

DOI:

10.14359/51751807

Document: 

CI4806Q&A

Date: 

June 1, 2026

Publication:

Concrete International

Volume:

48

Issue:

6

Abstract:

Successful planning, forming, and installation of expansion joints requires coordinated design and construction decisions before concrete forming and placement. This coordination includes: 1) establishing construction tolerances for formwork and concrete placement; 2) reviewing the manufacturer’s printed installation instructions (MPII) for the specified expansion joint; 3) estimating slab movements that will occur after forming and placement but before joint installation; 4) defining the installation timing; and 5) joint protection and repair. Effective coordination of these factors is essential to achieving successful expansion joint construction.

DOI:

10.14359/51751766

Document: 

SP370_10

Date: 

May 1, 2026

Author(s):

Janis Moye, Sylvia Keßler, Patrick Sturm

Publication:

Symposium Papers

Volume:

370

Abstract:

Supplementary cementitious materials (SCM) are promising alternatives for the reduction of CO2 emissions in the cement industry. Despite extensive research, their adoption, using Germany as an example, remains low due to potential disruption in manufacturing processes and standardization issues. Furthermore, the precursor output rate of e. g., fly ash and ground granulated blast furnace slag (GGBFS) is limited not only due to general cement substitution but for shortages in their respective industries. As a result, SCMs may only serve as a viable alternative binder in niche applications, such as concrete maintenance and repair. Additionally, the use of dry activators such as Na2CO3 facilitates conventional production methods.

This paper discusses results of sodium carbonate-activated slag mortars that were applied to concrete reference plates (A3-type as described in “Technische Regel Instandhaltung von Betonbauwerken,” eng. technical guideline for maintenance of concrete structures). The performance of alkali-activated slag (AAS) mortars was evaluated in terms of shrinkage behavior, compressive, flexural, and adhesive strength after dry thermal cycling and thunder-shower cycling. Interestingly, the results showed enhanced strength after exposure to these experimental conditions in comparison to ambient temperature curing. This highlights the critical role of proper curing, as AAS mortars are highly susceptible to increased shrinkage when not exposed to sufficient moisture.

The previous results show that AAS mortars - even without optimization - meet the required properties for structural repair class “R3” as defined in DIN EN 1504-3, promoting SCMs as promising alternative binders for these practical use cases.

DOI:

10.14359/51751753

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: 

CI4804ICRIawards

Date: 

April 1, 2026

Publication:

Concrete International

Volume:

48

Issue:

4

Abstract:

The International Concrete Repair Institute (ICRI) presented the Project of the Year Award to Sika Corporation out of Canfranc, Spain, for its Canfranc Station Hotel project. This project transformed a deteriorating rail station into a luxury hotel while preserving its cultural and architectural heritage. ICRI awarded six additional Awards of Excellence and 12 Awards of Merit as part of its 2025 Project Awards.

DOI:

10.14359/51750639

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