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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:
SP107-10
Date:
June 1, 1988
Author(s):
J. M. Shilstone, Jr.
Publication:
Symposium Papers
Volume:
107
Abstract:
A contractor's construction requirements include different factors than are normally considered in concrete mix proportioning. Changes in materials and job conditions during construction can affect concrete and its ability to meet the contractor's construction needs. Computerized analysis of aggregate gradations and concrete mix proportions from project submittals help reveal potential workability problems that will impact pumping, economy, and finishing. Statistical analysis of concrete test results can reduce concrete cost by using the ACI Building Code to determine minimum average strength requirements. Ongoing analysis of changing materials and job conditions can predict and resolve problems rapidly and, therefore, minimize delays. Two computer programs, seeMIX and seeSTAT, are used to demonstrate how computer analysis can aid construction projects.
DOI:
10.14359/3653
SP107-11
K. C. Hover
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.
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
Editor: Ramon J. Cook
SP-107 When building a concrete structure, quality and economic efficiency go hand-in-hand. Substantial savings can be achieved by integrating the forming system into the total building process. Forming Economical Concrete Buildings has been especially prepared as an aid to both the designer and contractor. With the cost of formwork sometimes representing over half the cost of construction, it should be fully considered when selecting building designs, layouts, structural member sizes, and construction methods. A collection of 12 papers, Forming Economical Concrete Buildings, offers the reader a variety of ideas which can lead to substantial savings in formwork costs.
10.14359/14140
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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