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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 40 Abstracts search results

Document: 

CI4802PTIAwards

Date: 

February 1, 2026

Publication:

Concrete International

Volume:

48

Issue:

2

Abstract:

The 2025 Post-Tensioning Institute (PTI) Project Awards recognized projects that demonstrate innovation, complexity, cost effectiveness, and aesthetics in post-tensioned (PT) concrete design and construction. The 2025 Project of the Year Award was bestowed to One River North, in Denver, CO, USA.

DOI:

10.14359/51749507

Document: 

CI4210Shushkewich

Date: 

October 1, 2020

Author(s):

Kenneth W. Shushkewich

Publication:

Concrete International

Volume:

42

Issue:

10

Abstract:

Haunched single-span bridges (HSSBs) are used where an aesthetically pleasing graceful shape is desired and/or the vertical clearance needs to be maximized. After a brief introduction into simple-span bridges with short cantilever extensions, the article provides a complete design example for a post-tensioned concrete box girder HSSB. The design example is presented as a simple six-step procedure. These bridges are relatively easy to design, even for novice bridge designers.

DOI:

10.14359/51728200

Document: 

SP-338_01

Date: 

March 1, 2020

Author(s):

Ward R. Malisch and Heather Brown

Publication:

Symposium Papers

Volume:

338

Abstract:

Bugholes on as-cast surfaces are an aesthetic issue, not a performance issue related to strength, durability, or serviceability. Because they are an aesthetic issue, attempts to evaluate bugholes objectively, with measurements, are not useful. Measuring bugholes using an evenly divided scale or other instrument can reveal their number, individual area, and total area as a percentage of a sample area. But there is no scale or instrument for aesthetic judgments. Thus, matching a mock-up surface with the as-cast surface, although subjective, is a better method for acceptance of surface appearance.

DOI:

10.14359/51724722

Document: 

SP-338_04

Date: 

March 1, 2020

Author(s):

Jacob L. Borgerson and Woodward L. Vogt

Publication:

Symposium Papers

Volume:

338

Abstract:

ACI 347.3R-13 provides guidance on the measurement and classification of surface voids (i.e., bug holes) in as-cast formed concrete surfaces. This paper will provide perspective from a testing laboratory on the challenges encountered when asked to perform surface void ratio measurements. Measurements were performed by field technicians and an engineer using the method as described in ACI 347.3R-13, in addition to a modified approach. Based on measurements performed on test areas of a cast-in-place shear wall for a high-rise condominium, it was determined that the between-operator variation and the selected test area significantly impact the classification of the surface. Because the test method does not specify methods for test area location selection or the number of test areas to sample, test results can vary greatly. Specifically, two 24 in. x 24 in. (610 mm x 610 mm) areas that are within 12 in. (300 mm) of each other may possess the highest and lowest classification. Based on field test results, an alternative method is proposed that provides better repeatability between operators and is more time efficient. In addition, based on measuring several different test areas on the same concrete surface, the number of test areas needed to accurately represent the void area of a surface was estimated.

DOI:

10.14359/51724725

Document: 

SP310-41

Date: 

March 17, 2017

Author(s):

Pedro Serna; Juan Ángel López; Esteban Camacho; Hugo Coll; Juan Navarro-Gregori

Publication:

Symposium Papers

Volume:

310

Abstract:

The 43.5-metre span truss footbridge over the Ovejas ravine in Alicante, made only of UHPFRC, has replaced a previous design in steel with a similar production cost, and also with improved durability and fewer maintenance costs. Thorough work was carried out in terms of material dosage, structural design and manufacturing process to minimise the total cost of the footbridge and to also make it safe, functional and pleasant. The footbridge design confers on fibres a very important role in structural behaviour. They are responsible for cracking control, ductility, confinement and, in some elements, they allow to dispense with any passive reinforcement. The most important aspects related to the structural analysis, structural design criteria, manufacturing process, cost distribution and final footbridge appearance are presented.

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