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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 56 Abstracts search results
Document:
SP138-18
Date:
September 1, 1993
Author(s):
Tatsunori Makizumi, Yoshifumi Sakamoto, and Shinichiro Okada
Publication:
Symposium Papers
Volume:
138
Abstract:
Investigates the cracking control effectiveness for flexural cracking of carbon fiber net (CFN) reinforcement, a two-dimensional grid consisting of sets of continuous carbon fibers. Prestressed concrete sheet piles with and without CFN reinforcement were tested in bending and the crack widths were examined. The CFN used in these tests had an element spacing of 20 mm in each direction; each element consisted of three strands each of 18,000 (18K) filaments. The netting was located in the specimens at a concrete cover of 3 mm. Since CFN could be set near the concrete surface and the transverse strands of CFN play an important role in resisting the applied tensile force, the crack widths were controlled effectively. A model for the prediction of crack width in concrete reinforcement with CFN is proposed. Good agreement with the calculated results and the experimental data is obtained.
DOI:
10.14359/3927
SP138-19
T. Tamura, H. Mikami, O. Nakano, and N. Kishi
Presents the results of experimental study on the shock-absorbing performance of a prototype three-layered cushion system. This system consists of a concrete core slab reinforced with a braided aramid fiber plastic (AFRP) rod, and sandwiched between sand (top) and expanded polystyrol (bottom) layers. To study the effect of the rigidity, elongation, and bond strength of reinforcing bars on the shock-absorbing performance of a three-layered cushion system, three types of reinforcing bars were used: AFRP rod with surface bonded with silica, nonsand surfaced AFRP rod, and deformed steel bar. Furthermore, these results were compared with the results when a single sand layer was used as cushion material. The results achieved from these experiments are: (1) the transmitted stress of the three-layered cushion system is distributed more effectively than that of a single sand layer; (2) the distribution pattern of the transmitted stress in the three-layered cushion system was affected by the bond property of the reinforcing bar; and (3) duration time of the transmitted impact force was affected by the rigidity of the reinforcing bars.
10.14359/3928
SP138-20
E. Makitani, I. Irisawa, and N. Nishiura
Bond tests with beam specimens were performed to research the bond characteristics of fiber reinforced plastic bars in concrete members that were made of such continuous fibers as carbon, aramid, glass, and vinylon, as well as epoxy resin matrix, especially when the ends of the bars were not reinforced. It was observed that bars whose surfaces were processed into a spiral shape or covered by cohesive grains of sand did not pull out if the bond length was more than 40d, where d was the diameter of the fiber reinforced plastic bar. Based on these tests, using carbon fiber reinforced plastic bars, tests of lap splice joints were performed by arranging an anchoring position in the center of a truss-type concrete specimen. It was found that the unit bond strength increased as the length of the lap splice joint increased, but that it decreased for lap splice lengths between 40d and 60d.
10.14359/3929
SP138-21
M. R. Ehsani, H. Saadatmanesh, and S. Tao
An overview of a study on bond of glass fiber reinforced plastic (GFRP) reinforcing bars to concrete is presented. The 78 specimens to be tested include several variables, such as the mode of failure (i.e., pullout or splitting), concrete compressive strength, bar diameter, clear cover distance, and top bar effects. In addition, the effect of the radius of bend for hooked bars and the extension on the hooks are investigated. The study is currently in progress and the results of the specimens tested to date are presented. Preliminary results indicate that the top bar effects observed for steel reinforcing bars are also present for GFRP bars. For hooked bars, larger radii of curvature increase significantly the failure load of the bars.
10.14359/3930
SP138-24
Lars E. Holte, Charles W. Dolan, and Richard J. Schmidt
Finite element analyses and experimental confirmation tests were conducted to evaluate epoxy-socketed anchors for fiber reinforced plastic prestressing tendons. The studies disclosed that a parabolically varying profile provides superior performance compared to a conventional linear conic anchor. It was also found that an anchor with a bond release agent on the surface between the socket and resin plug results in a lower peak shear stress compared to a bonded anchor. The combination of a parabolic anchor and bond release agent permits use of a wider range of resins as socketing agents and is less sensitive to construction tolerances. Additional research is suggested to optimize material selection, anchor geometry, and anchor construction.
10.14359/3931
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