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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 522 Abstracts search results

Document: 

CI4803Q&A

Date: 

March 1, 2026

Publication:

Concrete International

Volume:

48

Issue:

3

Abstract:

This month’s Q&A assesses the potential limitations of large language models (LLMs), a form of artificial intelligence, when used by licensed design professionals. It highlights the importance of verifying and fact checking information received by LLMs such as Open AI’s ChatGPT.

DOI:

10.14359/51750556

Document: 

CI4802Klinger

Date: 

February 1, 2026

Author(s):

James Klinger, Jeremiah Mistele, Frank Salzano, Eamonn F. Connolly, and Bruce A. Suprenant

Publication:

Concrete International

Volume:

48

Issue:

2

Abstract:

In this article, information is provided regarding top-of-column tolerances and their impacts on constructability and productivity. The authors recommend that key ACI committees provide guidance on top-of-column tolerance specifications.

DOI:

10.14359/51749509

Document: 

CI4711Subramanian

Date: 

November 1, 2025

Author(s):

N. Subramanian

Publication:

Concrete International

Volume:

47

Issue:

11

Abstract:

This article discusses air-entrained concrete, advantages of air entrainment, the effects of supplementary cementitious materials (SCMs) on the air-entraining admixture (AEA) dosage, and the effects of production and construction variables on air content. It explains parameters such as total air content, air-void size and distribution, spacing factor, and specific surface, and summarizes testing methods and relevant specifications, as well as alternatives to AEA.

DOI:

10.14359/51749281

Document: 

SP-363-1

Date: 

July 1, 2024

Author(s):

Raid S. Alrashidi, Rami Zamzami, Megan S. Voss, Daniel J. Alabi, Christopher C. Ferraro, H. R. Hamilton, Joel B. Harley, and Kyle A. Riding

Publication:

Symposium Papers

Volume:

363

Abstract:

The presence of chloride ions is one of the most widespread causes of corrosion initiation in reinforcing steel in concrete. Trace chlorides present in cementitious materials or admixtures typically result in very low fresh chloride contents in normal-strength concrete that do not present a danger of corrosion. UHPC mixture designs, however, use much higher dosages of cementitious materials and admixtures that can result in non-negligible total fresh chloride contents. These high chloride values are likely to occur more frequently in the future as more UHPC mixtures are made with locally available materials and alternative cementitious materials and may result in concrete mixtures failing to meet specifications for fresh chloride content limits that are based on mixture proportions used in normal-strength concrete mixtures. UHPC and normal concrete samples were made without fibers and with increasing levels of internally admixed chlorides for four different levels of strength to determine chloride thresholds for internally added chlorides. The chloride threshold for fresh concrete was measured using a slightly modified version of the accelerated test EN 480-14. The water-soluble and acid-soluble chloride ion content of UHPC mixtures tested were measured according to ASTM C1218 and Florida Method FM 5-516 to determine the bound chlorides and fresh chloride limits for corrosion. The results demonstrate that the UHPC had ~ 25% higher chloride threshold than the control mixture when measured as an absolute content per unit volume of concrete. When the UHPC chloride content is normalized by mass of cementitious material, it was found that the amount needed to initiate corrosion may be lower than fresh chloride limits given in ACI-318 and ACI 222. Therefore, the ACI-318 water-soluble chloride limits as a % by mass of cementitious materials were found to be non-conservative for the two of the UHPC mixtures tested and should be re-examined for UHPC.

DOI:

10.14359/51742104

Document: 

CI4607Klinger

Date: 

July 1, 2024

Author(s):

James E. Klinger, Eamonn F. Connolly, Charles D. Charlson, Oscar R. Antommattei, and Bruce A. Suprenant

Publication:

Concrete International

Volume:

46

Issue:

7

Abstract:

Various codes, specifications, and reports provide different requirements/recommendations for anchor bolt (rod) installation in foundations. The article discusses the issues related to these requirements/recommendations and encourages designers to add 2 in. (50 mm) to the calculated design embedment length and to specify the elevation of the top of the anchor bolt.

DOI:

10.14359/51740983

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