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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:
SP107-04
Date:
June 1, 1988
Author(s):
M. A. Riusillo
Publication:
Symposium Papers
Volume:
107
Abstract:
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.
DOI:
10.14359/3353
SP107-05
W. R. Carr
This building indicates what can be accomplished when the developer, architect, engineer, and contractor work as a team to determine the most economical frame cost for a project. The shape of this office building was of primary importance to the architect and owner, but it penalized steel construction. The team's willingness to pursue framing methods not usually utilized in Michigan lead to the acceptance of a concrete frame. Other projects have undoubtedly been constructed in steel when concrete would have been a more economical alternative. If contractors are to fulfill their commitment to owners, they must be aware of market conditions and market changes. The best system for the last project may not be best for the next. Awareness of new construction methods--and a willingness to utilize them when appropriate--is an important feature for general contractors to contribute to the building team.
10.14359/3360
SP107-06
J. M. Shilstone
This is a sequel by the author to a paper discussing the contract documents for architectural concrete. Here, the discussion covers those things that the contractor should do to produce an acceptable architectural concrete project. The recommendations start with a review of the contract documents to locate problems and potential points of conflict. From that point, materials, equipment, processes, and controls are described.
10.14359/3372
SP107-08
J. Bullock
In keeping with the theme of "Forming Economical Concrete Buildings," the end result of the project must be considered. Pumping of concrete walls from the bottom is not the most inexpensive method of wall construction unless the architectural possibilities of form and finish are considered. This concept, by eliminating or minimizing the need of concrete vibration during placement, allows more freedom of form by the designer than other conventional methods and almost guarantees an aesthetically pleasing finish. However, the economy of this technique is predicated upon spreading the initial cost of form fabrication over a broad base through the reuse of formwork. If a project has difficult concrete walls and/or lends itself to form reuse, the concept of pumping from the bottom becomes as economical as other more conventional methods.
10.14359/3377
SP107-09
A. J. Cellucci
This paper describes a permanent forming system constructed of panels molded of expanded polystyrene. The panels interlock for fast erection and remain in place to provide insulation to the finished wall. Construction of forms and walls is discussed. The system can be used above or below ground. Bracing and whaler systems, methods of forming window and door openings, and finishes are discussed.
10.14359/3382
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