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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 450 Abstracts search results

Document: 

CI4802Giannini

Date: 

February 1, 2026

Author(s):

Eric R. Giannini, Brett A. Harris, Eric P. Koehler, M. Tyler Ley, Mohammed J. Uddin, Anis Ghanei, James J. Martinoski, and James M. Casilio

Publication:

Concrete International

Volume:

48

Issue:

2

Abstract:

With the concrete industry undergoing a period of innovation and a broadening spectrum of cements available in the market, a key question to consider is: What’s next after Type IL cement, and how can we use blended cements successfully in concrete construction? A panel of experts explored this question at the Hot Topic Session at the ACI Concrete Convention Fall 2025 in Baltimore, MD, USA.

DOI:

10.14359/51749506

Document: 

CI4801InnovationForum

Date: 

January 1, 2026

Publication:

Concrete International

Volume:

48

Issue:

1

Abstract:

This article highlights a presentation from the 2025 Concrete Innovation Forum, “Using Pozzolanic Reactivity to Optimize Concrete Mixtures for Performance, Cost, and Sustainability,” developed by W. Jason Weiss, FACI, and Burkan Isgor, FACI. Delivered by Weiss, this presentation focused on combining science-based tests with rigorous computational models to help design concrete mixtures for the future.

DOI:

10.14359/51749390

Document: 

SP-362_76

Date: 

June 18, 2024

Author(s):

Wena de Nazaré do Rosario Martel, Josée Duchesne, and Benoît Fournier

Publication:

Symposium Papers

Volume:

362

Abstract:

Due to its predominant soda-lime composition, most post-consumer glass processed by recycling facilities would be classified as high-alkali pozzolanic glass powder (GP). In cementitious matrices, the intrinsic alkaline pore solution induces the dissolution of both silica and alkali ions. Therefore, the GP can potentially induce two similar reactions in concrete: either a deleterious alkali-silica reaction or a pozzolanic reaction. The equilibrium of the pore solution will determine which reaction will prevail in the long term. To understand the chemical stability of GP in a cementitious system, the evolution of the solubility of key elements in an alkali-rich synthetic pore solution was studied as a function of reaction time, particle size, presence of Ca(OH)2 and CaCO3, and binder/solution ratio (B/S). The solution was based on the R³ method, which consists mainly of lab-grade chemicals such as KOH and K2SO4. Although the chemical equilibrium seems to be fully reached in the first hours of hydration, the main products, such as C-S-H, are unstable because the alkali leaching/uptake in the C-S-H chains is dynamically evolving. The experiments show that both C-S-H precipitation and alkali leaching rates increase with increasing B/S ratio and decreasing particle size, and are directly related to the presence of calcium in the solution.

DOI:

10.14359/51742026

Document: 

SP-362_54

Date: 

June 17, 2024

Author(s):

Tafadzwa Ronald Muzenda, Fabien Georget, Thomas Matschei

Publication:

Symposium Papers

Volume:

362

Abstract:

In this study, we use different natural clays with a variety of mineral and chemical compositions to seek to understand the influence of the secondary minerals (i.e. not kaolinite) on early-age performance. The study shows that the R3 test is not suitable to assess the early-age reactivity, and early-age properties (compressive strength, rheology). It is also shown that the early-age performance of calcined clays is not dominated by metakaolin content and that secondary phases or impurities – for example, iron phases have a significant impact. A clinker-free model system with the aim of studying early-age reactivity is introduced.

DOI:

10.14359/51742004

Document: 

SP-362_56

Date: 

June 17, 2024

Author(s):

Abdelmoujib Bahhou, Yassine Taha, Yasmine Rhaouti, Mohamed El Amal, Rachid Hakkou, Mostafa Benzaazoua, and Arezki Tagnit-Hamou

Publication:

Symposium Papers

Volume:

362

Abstract:

The use of calcined clays as a substitute for traditional cement materials has the potential to significantly reduce the carbon emissions of the cement industry. However, for their widespread adoption and urgent need to feed the cement industry, it is essential to have a comprehensive understanding of the methods involved in processing these clays to ensure maximum reactivity. Thermal treatment of these clays induces chemical reactions that transform the combined materials into reactive pozzolan by eliminating hydroxyl groups from the clay structure, resulting in the activation of alumina and silica oxides. A commonly employed industrial method for activating these clays is through the use of a rotary kiln. With an optimal temperature profile and material retention time, rotary kilns play a crucial role in ensuring the production of high-quality calcined clays. This study aims to enhance control performance and achieve a highly reactive marl by optimizing the preparation process through three steps: (1) characterizing the raw materials, (2) optimizing the kiln parameters, and (3) conducting the life cycle assessment of the process. The reactivity of the calcined marl will be evaluated using the ASTM C1897 Standard Test Methods and the strength activity index.

DOI:

10.14359/51742006

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