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Home > Publications > International Concrete Abstracts Portal
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 86 Abstracts search results
Document:
25-045
Date:
September 11, 2025
Author(s):
Srishti Banerji, Venkatesh Kodur, and Augusto Gil
Publication:
Structural Journal
Abstract:
Ultra-high-performance concrete (UHPC) is increasingly gaining attention for structural applications, with structural fire safety being a key design factor. It is evident from recent research that UHPC structural members are prone to fire-induced spalling and have lower fire resistance than traditional concrete members. Currently, there are no specific guidelines for the fire design of UHPC members, and extending existing fire design provisions developed for conventional concrete members may not be appropriate, considering the unique challenges posed by UHPC. This paper outlines the critical factors contributing to the lower fire performance of UHPC structural members, discussing these factors in detail, using data from both numerical and experimental studies. Based on the results from parametric studies, as well as observations from published data, a set of design guidelines for mitigating spalling and enhancing the fire resistance of UHPC beams is proposed.
DOI:
10.14359/51749176
24-030
July 1, 2025
Kwanwoo Yi and Thomas H.-K. Kang
Volume:
122
Issue:
4
This study used finite element analysis to examine how tendon configuration affects the temperature behavior of post-tensioned concrete structures during fire exposure. The thermal behavior of various tendon configurations was modeled, showing good agreement with experimental data. Parametric studies found that unbonded single-strand tendons (S) and prestressing (pretensioned) strands (R) had lower thermal resistance than bonded post-tensioned tendons (B), unbonded post-tensioned tendons (U), and grouted extruded-strand tendons (G). The S and R specimens stayed at or below the critical temperature for one-way slabs, validating current safety codes. The B, U, and G specimens remained well below critical temperatures, indicating that a thinner concrete cover might suffice. These findings highlight the need to consider tendon configuration in structural fire-resistance evaluation and incorporate heat resistance assessment to ensure the safety and efficiency of prestressed concrete structures during fires.
10.14359/51745642
23-311
September 1, 2024
Sathya Thukkaram and Arun Kumar Ammasi
Materials Journal
121
5
Lightweight concrete (LWC) finds wide-ranging applications inthe construction industry due to its reduced dead load, good fireresistance, and low thermal and acoustic conductivity. Lightweightgeopolymer concrete (LWGC) is an emerging type ofconcrete that is garnering attention in the construction industryfor its sustainable and eco-friendly properties. LWGC is producedusing geopolymer binders instead of cement, thereby reducing thecarbon footprint associated with conventional concrete production.However, the absence of standard codes for geopolymer concreterestricts its widespread application. To address this limitation,an investigation focused on developing a new mixture design forLWGC by modifying the existing ACI 211.2-98 provisions has beencarried out. In this study, crucial parameters of LWGC, such asalkaline-binder ratio (A/B), molarity, silicate/hydroxide ratio, andcuring temperature, were established using machine learning techniques. As a result, a simple and efficient method for determining the mixture proportions for LWGC has been proposed.
10.14359/51742040
22-223
May 1, 2023
Siyoung Park and Thomas H.-K. Kang
120
3
With the development and commercialization of post-tensioned (PT) concrete structures, concerns pertaining to structural safety for disasters and diverse conditions, such as fire and high temperatures, have emerged. To better understand fire-resistance performance, effects associated with cover thickness and tendon configurations for six unbonded PT concrete slabs were evaluated in regardto temperature changes, deflection, tendon tensile forces, and fire endurance/time. In addition, the factors and relationship between the extent of damage caused by concrete cracking/delamination and tendon force at post-tensioning were evaluated. Thermal resistance and deflection rates for materials such as galvanized steel duct or high-density polyethylene (HDPE) sheathing were also examined. It is the authors’ hope that the aforementioned informationidentifying parameters affecting fire-resistance performanceof PT slabs may be helpful to the practitioner when consideringtendon configurations for unbonded PT concrete structures.
10.14359/51738512
21-512
January 1, 2023
Rumi Shrestha, Hannah Kessler, Laura Redmond, and Prasad Rangaraju
1
Lightweight (LW) aggregates (LWAs) improve fire resistance, moisture resistance, and durability in addition to reducing the selfweight of concrete. However, the ACI 318 code includes a modification factor (lambda) to account for reduced tensile capacity in LW concrete. LWAs are not currently permitted for use in masonry grout due to lack of test data to establish appropriate modification factors for the TMS 402/602 code. This study is a pilot study that aims to experimentally determine how the tensile breakout and shear breakout capacity of cast-in-place bent-bar anchors in masonry assemblies with LW grout compare with the predictions of TMS 402-16 for anchors in normal weight (NW) grout, and with results in the literature for assemblies using NW grout to see if additional testing would be needed to determine a lambda factor for shear and tensile behavior of LW grout. The results indicate that a reduction factor for bent-bar anchor bolts in masonry constructed with LW grout may not be needed, but additional testing should be conducted with smaller bar diameters to demonstrate the consistency of these results across bar sizes.
10.14359/51737233
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