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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 13 Abstracts search results
Document:
SP107-11
Date:
June 1, 1988
Author(s):
K. C. Hover
Publication:
Symposium Papers
Volume:
107
Abstract:
The development of flexural cracking in beams and slabs is discussed with particular reference to the incidence of cracking caused by the removal of formwork and shoring. Flexural cracking is shown to be distinct from, and only indirectly related to, structural capacity. The resistance to cracking is directly related to the modulus of rupture of the concrete, which is likewise indirectly related to the more commonly known compressive or "cylinder" strength of the concrete. Resistance to cracking is shown to decrease sharply during periods in which the surface of the concrete is drying, such as the period of time immediately following the removal of forms.
DOI:
10.14359/2912
SP107-02
L. E. Svab and W. T. Scott
Cast-in-place concrete one-way ribbed slab decks are undergoing an evaluation. Slab thickness established by fire rating requirements and considerations of minimizing formwork labor and maximizing material economy have dictated a departure from the use of traditional 20 and 30 in. wide joist forms. Wider joist forms are being increasingly used to answer these considerations. Wide module joist systems generally have 6 to 8 in. wide ribs at 5 to 6 ft centers with 4-« in. top slabs and are supported by wide beams. The ribs are designed as T-beams rather than joists. ACI 318-83 design requirements are not pinpointed for the evolved slab/joist-beam system. Presented is an attempt to interpret and apply ACI 318-83 design requirements together with detailing and design considerations that are unique to this framing system.
10.14359/2916
SP107-01
W. R. Anthony
This text moves from a macro view of the entire building process toward a micro view of the specific details, in an effort to maximize the value of a site-cast concrete building frame. It starts with an economic overview of the development process, including a budget analysis of a concrete framed building. A case is made for three basic principles that lead to constructability, allowing for efficiency during the construction of a site-cast concrete building from a formwork perspective. The text focuses on both horizontal and vertical design strategies, then attempts to integrate these concepts into a total project strategy using a 10-step approach. This paper stresses the need for teamwork. Teamwork is the key to achieving economy in the construction process, and good communications among all parties facilitates the team effort. The text is the product of a collaborative effort by the concrete construction division of a corporation. Their findings and recommendations were organized and integrated by the author. Additional resources are noted at the end of the article.
10.14359/3339
SP107-03
J. Zimmerman
Air-supported forming represents a rapid and cost-effective technique for building long span, thin shell, monolithic concrete structures. This construction method consists of inflating an air form, designed to the required building size and shape, after attachment to a foundation ring. Once inflated, the inside skin of the air form is sprayed with polyurethane foam. Steel reinforcement is fastened to the inside surface of the foam. Concrete is sprayed over the steel reinforcement, again from the inside. Steel is not placed, and concrete is not sprayed where shell openings are required. The air form can be color-coated and textured, or removed for reuse when protective coatings are applied over the exposed foam. This technology is appropriate for free-span architectural applications, bulk storage of granulated solids, and liquids.
10.14359/3346
SP107-04
M. A. Riusillo
The lift-slab method of construction, developed 38 years ago in Texas, has undergone detail changes and modernization of equipment over the years. The basic concept however, remains the same. The flat, concrete floor and roof slabs, usually post-tensioned, are poured one on top of the other at ground level, using the slab on ground as the first soffit form. After all the slabs are poured, they are lifted from above using synchronized hydraulic jacks located on the columns. Floor slabs with as many as 32 columns and 25,000 ftý can be lifted in one piece, while larger floor areas would require sectioning. The economical range of lift-slab construction is from 3 to 20 stories with 5 to 12 story buildings being the most common. The economy is inherent in the fact that reinforcing and concrete work are done at ground level, and that 90 percent of the form work is eliminated. Economy, flexible design, and quality construction, along with clean, safe, and efficient working conditions are all reasons to investigate lift-slab construction for multistory housing, offices, and parking garages.
10.14359/3353
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