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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 758 Abstracts search results

Document: 

SP369-02

Date: 

May 1, 2026

Author(s):

C. Sarta, F. Castiglioni, M. Gamba, E. Moretti, P. Clemente, A. Bravo, G. Ferrari

Publication:

Symposium Papers

Volume:

369

Abstract:

PCEs have become essential ingredients in concrete technology, because they allow the production of modern concrete, characterized by ease of placement, low water-to-cement ratio and high durability. The possibility of modifying the chemical structure of PCEs over a wide range of properties allowed the development of plenty formulations engineered for different applications (ready-mixed, precast concrete industry), types of cement and climate conditions. In PCEs’ technology, the side chain length is a fundamental parameter not only in determining the dispersibility but also the cement hydration kinetic. Longer side chains are used for PCEs with high water reduction capability and low retarding effect, while shorter chains offer more a robust behavior in different application conditions. In the present work three different PCEs were synthesized, characterized by same backbone length, same carboxylic acid to side chain ratio and different side chain length. Several measurements and tests were performed, both in cement paste and mortar. Results confirmed the importance of the side chain length of PCEs in determining the plasticizing effect while the retardation of hydration mainly depends on backbone charge density and distribution. This contributes to clarify the correlation existing among the different parameters determining the functionalities of this fundamental class of admixtures.

DOI:

10.14359/51750717

Document: 

CI4805Kalousdian

Date: 

May 1, 2026

Author(s):

Aram Kalousdian

Publication:

Concrete International

Volume:

48

Issue:

5

Abstract:

During a Transportation Research Board (TRB) webinar, Roberto Piacentino, Precast Sub-Segment Manager for Geoquest, presented the TechSpan® System, a three-hinged precast arch system used to construct buried bridges. This article highlights a bridge built with the TechSpan System in Ras Al Khaimah, United Arab Emirates, in 2000.

DOI:

10.14359/51750689

Document: 

CI4803Huso

Date: 

March 1, 2026

Author(s):

Deborah R. Huso

Publication:

Concrete International

Volume:

48

Issue:

3

Abstract:

The new Princeton University Art Museum, with its precast, ribbed concrete walls, includes nine bunker-like, interconnected pavilions with deep cantilevers and corners that have been shaved off to reveal the aggregate of the concrete. The brutalist vault of a building offers twice the floor space and provides a cultural gateway to the university campus.

DOI:

10.14359/51750550

Document: 

CI4703Elkhouly

Date: 

March 1, 2025

Author(s):

Ahmed F. Elkhouly, Mohammed H. Hedia, and George Morcous

Publication:

Concrete International

Volume:

47

Issue:

3

Abstract:

Hollow-core (HC) slabs are precast/prestressed concrete members with continuous voids oriented parallel to the span of the slabs. Openings in HC slabs are one of the most common challenges encountered during construction. This study experimentally evaluated the effectiveness of proposed strengthening methods for HC slabs with unforeseen structural openings.

DOI:

10.14359/51745651

Document: 

SP364_2

Date: 

December 1, 2024

Author(s):

Youjin Chae, Min-Jun Jeon, Chang-Kil Ju, Seung-Il Kim, and Tae-Sung Eom

Publication:

Symposium Papers

Volume:

364

Abstract:

Modular construction has been attracting attention worldwide as a promising solution to reduce construction time and labor demand. In this study, a new inter-module composite floor system that connects the upper module floor beams and lower module ceiling beams was experimentally and analytically investigated with an emphasis on vibration performance under service loading. First, the upper module floor of 2 m [6.56 ft] wide and 6 m [19.7 ft] long was fabricated as a composite system consisting of precast concrete (PC) panels, steel beams and ultra high-performance concrete (UHPC) connectors. Structural integrity between PC panels, steel beams and UHPC connectors were secured using grouting and topping mortar. Then, the lower module ceiling beams were connected to the upper module floor beams by fully tensioned high-tension bolts (i.e., slip-critical connection) to complete the inter-module composite floor. The vibration frequencies, damping ratio, and acceleration responses of the inter-module composite floors were measured from laboratory tests such as impact hammer, heel drop and walking tests, considering the number and location of the connecting bolts as the test parameter. The vibration characteristics of the inter-module composite floors were investigated further through finite element analysis. The measured and predicted vibration performances were compared with the acceptance criteria in AISC Design Guide 11 and ISO 10137.

DOI:

10.14359/51745454

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