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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:
SP138-09
Date:
September 1, 1993
Author(s):
E. Sueoka, K. Yasuoka, O. Kiyomiya, M. Yamada, M. Shikamori
Publication:
Symposium Papers
Volume:
138
Abstract:
For better durability and more rapid construction of reinforced concrete marine structures, the authors designed composite beams that consist of channel-shaped precast concrete forms reinforced with FRP and inner reinforced concrete. In this study, static flexural and shear tests were conducted to ascertain basic mechanical properties and estimate design methods of these types of beams. The flexural capacity coincided well with the values calculated by a conventional design method. The shear capacity was calculated on the conservative side by 20 to 30 percent by using the Niwa equation. No dislocation occurred between the form and inner concrete up to the level of the design load. However, dislocations were observed between them at shear stresses of more than 22 kgf/cm 2, and therefore shear connectors (studs) were needed for their prevention.
DOI:
10.14359/3922
SP138-10
Janusz Kasperkjewicz and Hans W. Reinhardt
Several researchers have used aramid fibers as prestressing tendons and as chopped fibers in concrete because of their high strength and chemical resistance. In this investigation, an aramid fabric is used as bending reinforcement in concrete beams. Cracking, bending capacity, and ductility are determined experimentally. It is shown how effective aramid fabric can be if applied in several layers as tensile reinforcement.
10.14359/3924
SP138-11
Takehiko Maruyama, Masato Honma, and Hajime Okamura
The authors introduced bends into FRP rods and, after embedding them in concrete, applied loads to investigate the tensile strength of the bent portions. The results show that the FRP rods ruptured at the bend, and that tensile strength decreases as the curvature of the bend increases. They also indicate that the tensile strength of the bend varies with the strength of concrete, fiber type, and method by which the rods are manufactured. 214-493
10.14359/3925
SP138-16
Hamid Saadatmanesh, Mohammed Ehsani, and Mu-Wen Li
Fiber composites have become increasingly popular in the civil engineering community in recent years. The primary area of research and development of fiber composites in the concrete industry has been related to fiber reinforced plastic (FRP) reinforcing bars. Paper presents a different application of fiber composites in concrete structures, namely, confinement of concrete columns with fiber composite wraps for improved ductility and seismic performance. The confinement is accomplished by wrapping high-strength fiber composite belts around the columns. The belts are made very thin, resulting in flexibility sufficient to their being wrapped around circular as well as rectangular columns. The belts can be wrapped around the column in individual rings or in a continuous spiral. The ends of the belts can be mechanically coupled or they can be epoxy-bonded to the column. The confinement provided by the belts results in significant increase in the crushing strain of concrete well above that of unconfined concrete. This will improve the overall strength and ductility of the column. Paper presents the results of an analytical study and ongoing experimental study of concrete columns externally confined with fiber composite wraps.
10.14359/3926
SP138-18
Tatsunori Makizumi, Yoshifumi Sakamoto, and Shinichiro Okada
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.
10.14359/3927
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