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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 39 Abstracts search results
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.
SP-338_04
March 1, 2020
Jacob L. Borgerson and Woodward L. Vogt
Symposium Papers
338
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
SP-338_01
Ward R. Malisch and Heather Brown
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.
10.14359/51724722
SP310-41
March 17, 2017
Pedro Serna; Juan Ángel López; Esteban Camacho; Hugo Coll; Juan Navarro-Gregori
310
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.
CI3010Nasvik
October 1, 2008
Joe Nasvik
30
At the ACI Fall 2008 Convention in St. Louis, MO, ACI Committee 124, Concrete Aesthetics, will sponsor a session on "Uplifting Concrete in Churches, Museums, and Civic Architecture." One of the topics presented will be the Pulitzer Foundation for the Arts in St. Louis, MO. The building was designed by Tadao Ando of Osaka, Japan, and is considered a masterpiece in concrete. Because the walls are exposed concrete and no patching was allowed, color had to be consistent throughout the project, every wall surface had to have a "smooth silky finish" free of leak marks and fins, and the intersections of walls and floors, as well as corners for door and window openings, had to form crisp, sharp, and precise lines. The contractor’s efforts to produce the finished surface appearance required by the architect are reviewed.
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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.
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