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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 3393 Abstracts search results

Document: 

CI4807Covarrubias

Date: 

July 1, 2026

Author(s):

Juan Pablo Covarrubias, Robert Rodden, Jeffery Roesler, Lev Khazanovich, Jorge Olavarria, and Nigel Parkes

Publication:

Concrete International

Volume:

48

Issue:

7

Abstract:

Conventional slab-on-ground design methods rely on simplified assumptions derived from Westergaard solutions that do not capture key behavioral mechanisms such as slab curling, partial loss of support, concrete shrinkage, and realistic load transfer. This paper presents a mechanistic design framework based on two-dimensional (2-D) finite element analysis (FEA) that incorporates these effects, coupled with calibrated empirical methods for estimating slab capacity.

DOI:

10.14359/51751805

Document: 

CI4807ConcreteQ&A

Date: 

July 1, 2026

Publication:

Concrete International

Volume:

48

Issue:

7

Abstract:

Currently, there is no established standard for hybrid construction joints. The upcoming ACI PRC-360, “Design of Slabs-on Ground,” will provide information on the purpose and design of such joints. However, the document will not provide a solitary standard hybrid joint detail, as the design depends on the amount of reinforcement used throughout the slab and the type of dowels specified for the construction joints.

DOI:

10.14359/51751813

Document: 

SP370_18

Date: 

June 1, 2026

Author(s):

M. Ojo, A. Rocha, A. Corraya, L. Frame, K. Wille

Publication:

Symposium Papers

Volume:

370

Abstract:

Concrete specimens containing iron sulfide-bearing aggregates were investigated under electrochemical acceleration to evaluate potential damage mitigation strategies. Cylinders were prepared with different aggregate sizes, sulfide contents, water-to-cement ratios, cement types, and pozzolanic replacements, and subjected to controlled electrochemical exposure to reproduce field-like deterioration within weeks. Damage progression was monitored using resonance frequency measurements, visual crack quantification, and microstructural analysis. Results showed that higher sulfide contents accelerated modulus loss and crack initiation, with coarser aggregates producing visible cracking and greater stiffness reductions, while finer aggregates largely avoided macrocracking. Higher water-to-cement ratios further accelerated deterioration, whereas lower ratios delayed both onset and propagation. Cement type and pozzolanic additions also influenced deterioration, with all mixtures exhibiting damage under electrochemical acceleration. Specimens containing Type I white Portland cement demonstrated greater resilience against rapid failure, while partial cement replacement with glass powder delayed early crack propagation. These findings demonstrate that electrochemical acceleration provides a reliable platform for evaluating potential mitigation strategies and show how mixture design parameters influence deterioration progression in iron sulfide-bearing concrete, offering insights that support the development of practical approaches to manage this durability problem.

DOI:

10.14359/51751780

Document: 

SP370_19

Date: 

June 1, 2026

Author(s):

Chloe Thorp, Medhat H. Shehata

Publication:

Symposium Papers

Volume:

370

Abstract:

With the reduced availability of traditional supplementary cementing materials (SCMs), a need arises for alternatives. This study presents an investigation into the reactivity of powders derived from reactive siliceous aggregates, some of which demonstrated pozzolanic potential by reducing concrete expansion associated with alkali-silica reaction (ASR). A dissolution test was conducted to quantify the amounts of soluble silica and alumina available for pozzolanic reaction. The aggregate powders were immersed in an alkaline solution designed to simulate the alkalinity of concrete pore fluid and tested at four different temperatures to evaluate the effect of temperature on the dissolution behavior. These tests were performed in parallel with ASR expansion testing to determine whether dissolution data could serve as a rapid indicator of pozzolanic potential, reducing the need for long-term monitoring. The results indicated that dissolution kinetics varied significantly with temperature, raising concerns about the use of high-temperature methods to evaluate pozzolanic activity. Aggregate powders containing calcium exhibited notable physical changes, suggesting reactions involving both silica and calcium in the solution. A strong inverse relationship was observed between dissolved silica and aluminum concentrations; all solutions exhibited either high aluminum and low silica, or high silica and low aluminum, but never elevated levels of both simultaneously. Finally, the powders were analyzed using X-ray diffraction (XRD) to assess mineralogical changes following alkaline exposure. Cryptocrystalline quartz, muscovite, and kaolinite phases were altered during the dissolution test, whereas other phases, including crystalline quartz, did not.

DOI:

10.14359/51751781

Document: 

CI4806Du

Date: 

June 1, 2026

Author(s):

Chongjiang Du

Publication:

Concrete International

Volume:

48

Issue:

6

Abstract:

Over the past four decades, significant advances have been achieved in material science and construction technologies for the construction of dams. Among these, MgO concrete, rock-filled concrete, and roller-compacted concrete have been applied on an increasing trend in the construction of concrete dams. The application of these innovative materials and technologies in arch dam construction makes it possible to omit transverse and longitudinal contraction joints, which can speed up construction progress and reduce project costs. This paper discusses the design and construction features of arch dams constructed without contraction joints, highlighting the role of innovative materialsand associated construction methods.

DOI:

10.14359/51751761

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