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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 97 Abstracts search results
Document:
SP188
Date:
August 1, 1999
Author(s):
Editors: Charles W. Dolan, Sami H. Rizkalla, and Antonio Nanni
Publication:
Symposium Papers
Volume:
188
Abstract:
SP-188 This volume presents 24 papers from the Fourth International Symposium and represents a significant expansion in the state of knowledge that has occurred since the First Symposium in 1993.
DOI:
10.14359/14223
SP188-01
A. Belarbi, K. Chandrashekhara, and S. E. Watkins
The main objective of this study was to develop a new type of FRP rebar with focus on ductility and health-monitoring issues. One approach to provide ductility was the use of a hybrid FRP reinforcing bar consisting of different types of fibers, which fail at different strains during the load history of the rebar, thereby allowing a gradual failure of the rebar. The rebar was manufactured using pultrusion and filament winding techniques. These techniques have made it possible to embed fiber optic sensors within the reinforcement, for health monitoring, thus protecting the sensor from the harsh concrete environment. Pseudo-ductile behavior was validated through testing of coupon FRP rebar as well as RC beams. Testing of large-scale beams reinforced with the hybrid FRP rebar exhibited remarkable ductility behavior with ductility indices close to that of beams reinforced with steel rebar. Furthermore, the strain measured from the embedded fibers optics replicates the measurement of conventional LVDT and was reliable up to failure of the beams.
10.14359/5608
SP188-02
T. Sugiyama, S. Tomita, S. Kouzaki, Y. Sato, T. Ueda, and A. Kobayashi
The authors have developed a continuous fiber flexible reinforcement (CFFR) which has good workability and can be used as a reinforcement in concrete. It consists of a plastic tube containing continuous fiber bundles and resin. The salient feature of this new material is that it can be easily formed at the construction site. The authors have conducted a study of fabrication methods of the material and an evaluation of its mechanical properties. This paper introduces the material and fabrication methods, and details the tensile strength of a member formed from this material. A member bent into a U shape was subjected to a load test to examine its basic properties. As a result, it was found that even when the material was bent, the applied tensile load was transmitted through it. Also, the load-deflection characteristic of the material and the stress concentration due to bending were influenced by the wall thickness of the plastic tube.
10.14359/5609
SP188-03
G. S. Kaski and C. W. Dolan
The long-term durability of FRP prestressing tendons in a harped configuration or in flexure under short radius bends has not been extensively investigated. Creep-rupture data for straight uniaxial tension testing may not be representative of the material behavior in a prestressing application requiring curvature of the tendon. The FRP response in a harped or bent configuration may be compromised due to a lack of ductility in the outer fibers of the tendon. Long-term creep-rupture experiments conducted on harped Carbon FRP tendons are reported. The tests are conducted in a bend test so outer fibers are stressed up to 88 percent of the uniaxial strength. All tests are conducted in air at nominal room temperature. This paper presents design information concerning the long-term performance of harped FRP tendons and coiled storage of FRP tendons.
10.14359/5610
SP188-04
N. Matsumoto, T. Harada, and K. Yagi
Discussions on the evaluation and standardization of test methods to obtain the material properties of continuous fiber sheets, which is applied to the repair and strengthening of concrete structures, have been conducted from 1998 in a working party of a research committee in the Japan Society of Civil Engineers. Among the mechanical and durability test methods to be standardized, the current discussions on the tension and bond test methods are introduced in this paper. As for the tension test, a new method to make the specimen to cope with large-tow or thick-yarn continuous fiber sheet is proposed and is to be adopted as one of the standard specimens. The variation of strengths depending on the different test specimens is discussed based on test results and a numerical analysis. As for the bond test, many elaborate test methods have been proposed but the simplicity is regarded very important for design application. Then, a simple test method is proposed as the standard method and a simplified evaluation method on bond strength is introduced.
10.14359/5611
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