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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 91 Abstracts search results
Document:
SP128-59
Date:
November 1, 1991
Author(s):
H. Watanabe, S. Kobayashi, H. Kawano, and K. Morihama
Publication:
Symposium Papers
Volume:
128
Abstract:
Reports on a nearly completed study begun in 1989 to improve the ductility of reinforced concrete members by mixing fibers with concrete. In this study, the bending test of fiber-mixed reinforced concrete beams made with two kinds of steel fiber and aramid fiber by reversal static loading has been done. From the test results obtained so far, it is shown that the ductility of fiber-mixed reinforced concrete beams is improved over that of normal reinforced concrete beams. It is calculated that the ductility factor of fiber-mixed reinforced concrete beams can be computed if the tensile strength and ultimate compressive strain are known.
DOI:
10.14359/3251
SP128-53
Zhoa Guofan, Huang Crengkui, and Wang Ruimin
Steel fiber reinforced concrete has been widely used in civil engineering. To promote further application of SFRC, there is a need to unify the design methods and construction techniques. Since 1988, an editorial committee for compiling a code for design and construction of steel fiber reinforced concrete structures has begun to work towards this purpose in China. Based on the results of extensive research activities and the experiences of practical application of SFRC, the draft of this code has been finished recently. The main contents of this code includes the requirements for the materials, basic design principles, ultimate limit state design, checking of the serviceability limit state, construction of SFRC, detailing of the SFRC structures with steel reinforcement, rules for design and construction of special structures, and design and construction for shotcrete SFRC. This paper will briefly introduce the main content of this code.
10.14359/3258
SP128-56
R. Iwaki, Y. Murayama, H. Akiyama, and R. Amano
Although prestressed concrete beams reinforced with fiber reinforced plastic (FRP) rods have a high potential of applicability to structures in corrosive or electromagnetic circumstances, most prestressed concrete beams showed brittle flexural failure in past experiments due to elastic rupture of the FRP used. From the viewpoint of the maintenance and hazard anticipation of structures, the brittle failure mode is undesirable. To improve the ductility, a series of flexural tests were carried out on beams with bonded and unbonded tendons, or with additional nontensioned tendons. Test results showed that the ultimate deformation in the beam with unbonded tendons was 250 percent that of the beam with bonded tendons, while the loading capacity was 90 percent, and additional placement of nontensioned tendons allowed a 400 percent larger deformation at ultimate load. Appropriate combinations of bonded and unbonded tendons with different amounts of tensioning force will satisfy the required ductility for each structure that is designed with each design concept.
10.14359/3263
SP128-47
George C. Hoff
Provides background information related to the feasibility of offshore concrete structures for the development of hydrocarbon resources in both newly developing regions of the world and in areas of existing offshore operations where concrete is currently not used. Bottom-founded structures, floating structures, and other more specialized structures are described and their market potential discussed. Three hundred offshore platforms are planned for Asia and Australia between 1990 and 1995; many of these could be built with concrete. The use of local concrete materials and labor to produce moderate strength concrete for these platforms is discussed. Special design and safety considerations are noted. The structures can be built in dry docks, on skidways, or on submersible barges. Portions of the structures can be precast concrete. All of these structures involve some marine operations. General cost considerations and life-cycle costs are discussed.
10.14359/3242
SP128-10
John R. Thurston and Thomas C. Fisher
This paper describes repairs on two prestressed concrete pipelines (inverted siphons) that were found to have distressed areas. The distressed areas included disbonded mortar coating, and corroded and broken prestressing wires. The siphons were dewatered, during January and part of February 1991, for repairs and inside inspection. Repairs in areas of major corrosion and broken prestressed wires consisted of removing the earth cover, excavating a limited-length trench under a pipe unit, and completely removing the mortar coating and prestressing wire around the pipe for 360 deg. High-strength steel tendons were placed around the pipe and stressed to the initial prestressing force. Shotcrete was placed over the tendons and anchors, followed by backfilling. The two siphons were returned to service on Feb. 15, 1991. The repairs appear to be successful in restoring the concrete pipe to its initial design strength.
10.14359/3370
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