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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 23 Abstracts search results
Document:
SP180
Date:
October 1, 1998
Author(s):
Editor: Roberto Leon
Publication:
Symposium Papers
Volume:
180
Abstract:
SP-180 During the ACI 1997 Spring Convention, ACI Committee 408, Bond and Development of Reinforcement, organized four sessions intending to assess the state of the art in bond research, practical applications, and code development. The sessions were organized into a symposium honoring Dr. Peter Gergely, a longtime member of Committee 408, who had recently passed away.
DOI:
10.14359/14173
SP180-17
H. 0. Hasan, D. B. Cleary and J. A. Ramirez
This experimental study addresses the performance of reinforced concrete slabs containing epoxy-coated reinforcement subjected to high-cycle/low stress range repeated loading typical of those encountered in bridge decks. The behavior under repeated load indicated that epoxy-coated reinforcement does not significantly increase deflections despite the larger bar slip associated with wider cracks. The wider cracks do increase the potential for increased amount of corrosive agent at the level of the top mat of reinforcement in bridge decks. The average bond strength ratios of coated to uncoated specimens support a proposed single modification factor of 1.35 for specimens with low cover.
10.14359/5886
SP180-18
J. Cairns, J. 0. Jirsa and S. L. McCabe
Fusion bonded epoxy coated reinforcement (FBECR) has been developed ! to help combat problems of corrosion in reinforced concrete structures. The surface i texture of the coating is smoother than the normal mill scale surface of reinforcing bars and alters bond characteristics of the bar. Although FBECR has now been in use for more than 30 years and production Standards have been established, rules for design using the material are not well developed. CEB Task Group 2/5 is currently reviewing data on bond and structural performance of elements reinforced with FBECR with the aim of deriving recommendations for design practice which will enable structures reinforced with FBECR to achieve equivalent performance to that of structures reinforced with millscale surface ribbed bars. This paper presents proposals for amendments to the CEB-FIP Model Code 1990 for design of anchorages and splices of coated bars, and briefly reviews other aspects of structural performance influenced by the different bond characteristics of FBECR.
10.14359/5887
SP180-19
T. Ichinase, T. Hayashi and W. Lin
An analytical model is presented to evaluate the local bond-slip relationship in RC lap splices considering the influence of splitting cracks, friction between the concrete and rib face, microscopic fracture of concrete in front of rib face, flexural deformation of the cover concrete, and stirrups. The local bond-slip relationship is integrated along the splice length considering the strain in the concrete in the longitudinal direction. It is shown that the lack of friction at a rib face due to epoxy coating reduces the ductility of the local bond slip relationship without stirrups, resulting in lower splice strengths. The contribution of stirrups to the splice strength is dominated by the flexural strength of the cover concrete with stirrups, and is the function of concrete strength rather than the yield strength of the stirrup.
10.14359/5888
SP180-20
B. Aarup and B. C. Jensen
CRC (Compact Reinforced Composite) is a special concept for high performance concretes, where ductility is achieved through incorporation of a large content of short, stiff and strong steel fibres (6 vol.%). This ductility combined with high strength (150-400 MPa) - and the ability of the small fi-bres to provide an effective reinforcement against even small cracks, makes it possible to obtain exceptional bond properties for deformed reinforcing bars. Results show that full anchorage is achieved with an embedment length of only 5-10 diameters for ribbed bars, which has led to applications in buildings, where CRC is used for in-situ cast joints between pre-cast decks -joints which can transfer full moments with a width of 100 mm. This type of joint, which was used for a university building, has been extensively tested for different loading situations and for behaviour in a standard fire. As the fibre reinforced matrix provides a strong, ductile joint which responds well to dynamic loads it is expected to perform well under seismic loads.
10.14359/5889
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