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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:
SP138-02
Date:
September 1, 1993
Author(s):
Rajan Sen, Daniel Mariscal, and Mohsen Shahawy
Publication:
Symposium Papers
Volume:
138
Abstract:
A comprehensive durability study of S-2 glass-epoxy pretensioned beams exposed to wet-dry cycles in 15 percent salt solution indicated a complete loss of effectiveness within 3 to 9 months of exposure. Paper presents results of subsequent follow-up investigations to identify the cause of this deterioration and also to examine practical measures that could be used to prevent its occurrence. The analysis of the test results suggests that the most likely cause of failure was diffusion of hydroxyl ions from the concrete pore solution through the resin. This is supported by SEM micrographs of the failed beam. While these conclusions are valid only for the S-2 resin, diffusion is also likely to be a characteristic of other types of resins, e.g., vinylesters and polyesters. This makes long-term protection of glass fibers in concrete problematic.
DOI:
10.14359/3857
SP138-03
K. Mukae, S. Kumagai, H. Nakai, and H. Asai
Bond characteristics of FRP rod and concrete after freezing and thawing deterioration
10.14359/3858
SP138-07
Taketo Uomoto and Hosam Hosam Hodsam
The mechanical behavior and tensile strength of three kinds of FRP rods were investigated experimentally. For each material, three different fiber volume fractions were tested in axial tension. The stress-strain relationships and strength distributions were obtained. The results were correlated to the behavior and strength of the basic strengthening elements, fibers, as determined experimentally. This yielded the possibility of predicting rod modulus, but not strength, from those fibers. The strength distributions showed a shift that is not generally proportional to rod fiber content. Investigation of this phenomenon, through stress analysis at the grips and inspection of failed rods, assured the change of rod failure modes for different fiber contents. The effect of grips could lead to one of two shear failure modes instead of tension mode. Therefore, an apparent strength reduction was observed. In view of rod properties, appropriate design of the gripping system is needed to obtain the best performance of the rods.
10.14359/3859
SP138-47
Tomoya Nagasaka, Hiroshi Fukuyama, and Masamaru Tanigaki
An experimental investigation was conducted to study the shear performance of concrete beams with bar-shaped FRP reinforcement. The 35 half-scale beams were subjected to monotonically increased shear force up to ultimate capacity. The principal variables were type and reinforcement ratio of stirrup and concrete strength. The beams with FRP stirrups failed due to either breaking of the curved stirrup sections or crushing of a diagonal strut. The former failure mode was excessively brittle and more undesirable than the latter. The ultimate shear capacity increased with increasing the content of FRP stirrup, and was not so remarkably affected by the type of stirrup, although the FRP stirrups without yielding did not so effectively carry the shear force as conventional steel stirrups. Under the same stirrups, the shear capacity of the beams flexurally reinforced with FRP bars was smaller than that of the beams with steel bars. Further, it was observed that the ultimate shear capacity of beams with FRP stirrups can be fairly well estimated by substituting the tensile strength of curved sections of stirrup for the yield strength in Arakawa's formula.
10.14359/4138
SP138-51
T. Okamoto, S. Matsubara, M. Tanigaki, and K. Hasuo
The authors had the opportunity to apply partially prestressed concrete (PPC) members reinforced and prestressed with braided aramid fiber bars to an actual structure. The PPC members were used as beams for an upper foundation of a seismic base-isolated story. The PPC beams were precast, pretensioned, prestressed concrete members reinforced with braided aramid fiber bars manufactured by braiding aramid fibers and epoxy resin impregnation. Braided aramid fibers were used as main reinforcement, prestressing tendons, and transverse reinforcement of the PPC beams. Design, fabrication, and construction of the beams are reported. Full-scale flexural tests were also conducted to insure the safety margins of the beams. Two specimens were prepared using aramid fiber bars and carbon fiber bars, with cross sections similar to the actual beams. The flexural capacity of the beam at rupture of tendons shows good agreement with the calculated capacity, which uses the average tensile strength of the bars. Full-scale fire-resistance tests were also conducted on two specimens with the same cross sections as the specimens for the flexural tests, although the design did not require fire resistance of the beams because of their use in the foundation. From the test results, the beams were considered to resist fire for about 2 hr.
10.14359/4141
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