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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 406 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: 

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: 

SP-362_52

Date: 

June 17, 2024

Author(s):

Gopakumar Kaladharan, Moe (Mohammadreza) Sharbaf, Farshad Rajabipour

Publication:

Symposium Papers

Volume:

362

Abstract:

A large volume of freshly produced and harvested coal ash (from landfills and ponds) contains SO3 content above 5.0%. This exceeds the allowable limit in major SCM specifications (e.g., in ASTM C618), and disallows the use of such coal ashes in concrete. This presentation explores the properties and performance of these coal ashes as SCM. It is shown that SO3 may be present in ash in the form of CaSO3, CaSO4, or Na2SO4 (including solid solutions of alkali sulfates and carbonates), and that the form of SO3 has a large impact on the performance of coal ash in concrete. For example, while ashes containing CaSO3 may cause extensive set retardation, those containing CaSO4 may increase the risk of internal sulfate attack and deleterious expansion. In this work, the mechanisms responsible for each behavior are explored, the allowable SO3 limits are better defined, and strategies for beneficiation of coal ashes that exceed such limits are introduced. The outcome is facilitating the safe and efficient use of large volumes of currently off-spec coal ash to produce durable and low-CO2 concrete.

DOI:

10.14359/51742002

Document: 

SP-360_14

Date: 

March 1, 2024

Author(s):

Camilo Vega, Abdeldjelil Belarbi, and Antonio Nanni

Publication:

Symposium Papers

Volume:

360

Abstract:

Most of the research related to interface shear transfer in concrete elements has utilized steel bars as reinforcement, while GFRP reinforcement has received little attention experimentally and analytically. For this reason, only a few design specifications include provisions for the calculation of the interface shear transfer when using GFRP. In this project, an experimental campaign is being conducted to determine the contribution of GFRP bars to the mechanism of shear transfer by using push-off specimens. The literature review and the test methodology are reported in this paper. The obtained results indicate that the use of GFRP reinforcement significantly enhances the interface shear strength, resulting in a capacity that exceeds those of the specimens without reinforcement. When the GFRP-reinforced specimen reaches the first crack at a load similar to that of the unreinforced specimens, it continues carrying load until it reaches a peak, thus indicating that the reinforcement is providing both dowel action and clamping force prior the shear failure. Additionally, once the peak strength is reached, the use of GFRP reinforcement allows the specimen to deform in a pseudo-ductile fashion thus preventing sudden failure.

DOI:

10.14359/51740626

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