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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 14 Abstracts search results
March 1, 2020
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.
Jacob L. Borgerson and Woodward L. Vogt
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.
March 17, 2017
Pedro Serna; Juan Ángel López; Esteban Camacho; Hugo Coll; Juan Navarro-Gregori
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.
April 1, 2007
H. Nhar, T. Watanabe, C. Hashimoto, and S. Nagao
Today, a number of engineering structures and building are being constructed to match environment and urban landscape. From an aesthetics point of view, occurrences of efflorescence on colored concrete, unfinished concrete and concrete products of these structures are critical problems. This research aimed to study and compare the efflorescence of concrete products that substituted cement with industrial by-products namely, fly ash, blast furnace slag and gypsum and normal concrete. Both concrete products and normal concrete were manufacture for paving application in form of interlocking blocks. In this paper, we use the term "non-cement" concrete to refer to the concrete not using industrial cement. A methodology is presented that enables a quantitative evaluation of the total, soluble and insoluble efflorescence and this methodology was used to analyze both non-cement concrete and normal concrete specimens. The results show that the insoluble efflorescence of non-cement concrete is less than that of normal concrete.
December 1, 2004
Don Zakariasen and Vic Perry
Ductal® is a new material technology offering a unique combination of superior characteristics including ductility, strength, and durability, while providing highly moldable products with a quality surface. The technology provides compressive strengths up to 200 MPa (30,000 psi), and flexural strengths up to 50 MPa (7,200 psi). The material’s unique combination of superior properties enables the designer to create thinner sections, longer spans, and higher structures that are lighter, more graceful and innovative in geometry and form while providing superior durability and impermeability against corrosion, abrasion, and impact. This material provides the precast industry with opportunities to improve many existing products and manufacture new products that will compete with other materials such as stainless steel, cast iron, ceramics, and others. This paper presents properties of the material, design assumptions for project solutions and the manufacture, installation and assembly procedures for specific projects including roof panels, 5 sided-boxes and anchor plates. Many economies gained from this new technology are a result of engineering new solutions for old problems. By utilizing the unique combination of superior properties, designs can eliminate passive reinforcing steel and experience reduced global construction costs, form works, labour and maintenance. Additionally, this relates to benefits such as improved construction safety, speed of construction, extended usage life and others.
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