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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
February 1, 2004
J. A. Ramirez, J. Olek, and B. J. Malone
An experimental investigation was conducted to compare the shear strength of lightweight reinforced concrete beams with that of normal-weight concrete companion specimens. The experimental variables were type of coarse aggregate, concrete compressive strength, and distribution of transverse and longitudinal reinforcement. A total of twelve specimens with shear reinforcement were tested. Seven specimens were made with normal-weight aggregate concrete and five specimens were made with lightweight aggregate concrete. The target concrete strengths were 41 MPa and 69 MPa. Measured shear capacities were compared with calculated values according to the 1998 AASHTO LRFD Bridge Specifications (Interim 2001) and ACI 318-02 Building Code. The experimental findings have shown that both code-based methods produce conservative estimates of shear strength within the range of variables considered in the study.
Since more than 70 years ago, lightweight concrete has been used in the marine environment. Prime examples use are the ship Selma, grounded off Galveston; and several other ships of that age, laid up, still able to float. Over the last couple of decades, interest in the actual performance of marine lightweight concrete has grown, and in consequence several studies have been made, covering durability, mechanical properties and design procedures. Since other papers in the session will be concerned with many of the structures that have been placed in or near the sea, these objects are not central to the presentation — the same can be said for general questions like design procedures, long term mechanical properties and the like. The central issues of the paper are specifically related to the marine environment: durability — namely reinforcement corrosion — is briefly touched upon, and water absorption over time and at depth is given more attention. This paper is an opportunity to publish data gathered more than 10 years ago; used, but never made available generally.
C. Ozyildirim, T. Cousins and J. Gomez
An experimental program was planned and executed to demonstrate the feasibility of using lightweight high performance concrete (LWHPC) bridge beams and decks. The prestressed American Association of State Highway and Transportation Officials (AASHTO) beams were designed for a minimum 28-day compressive strength of 8,000 psi (55 MPa) and the deck concrete for 4,000 psi (27.6 MPa). The maximum permeability was 1500 coulombs for the beam and 2500 coulombs for the deck concrete. The density was less than 120lb/ft3 (1920 kg/m3). This program was a necessary prelude to an LWHPC demonstration bridge built over the Chickahominy River on Route 106 at the Charles City County New Kent County line in Virginia.
M. J. Kowalsky and H. M. Dwairi
This paper discusses four aspects related to the seismic behavior of structures composed of lightweight concrete. Following a brief discussion of the merits of lightweight concrete, the past seismic performance of the material is discussed. The second portion of the paper discusses research that has been conducted on the seismic behavior of lightweight concrete structures and research on parameters that influence the seismic behavior of lightweight concrete. This is followed by a discussion of various existing code-based provisions that have an effect on the seismic design of lightweight concrete structures. Lastly, the paper concludes with a discussion of future research needs.
C. L. Tasillo, B. D. Neeley, and A. A. Bombich
In initiating the final phase of modernizing the locks and dams on the Monongahela River, the U.S. Army Corps of Engineers, Pittsburgh District, used float-in and in-the-wet technology to build the new Braddock dam. This is the first use of such technology for an inland navigation project in the United States, and was employed to eliminate the cost and construction time associated with a conventional cofferdam for mass concrete construction. The new Braddock dam design was fabricated as two large, hollow-core segments. Unlike such applications used for offshore structures, the inland application was limited by navigational draft, and lock and bridge clearances. This restricted the overall dimensions and mass of the segments. The use of lightweight concrete in a significant portion of the two large dam segments was central to the success of the design. Good planning, an understanding of the concrete materials, and quality control were critical to project success.
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