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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 73 Abstracts search results
Document:
SP275-60
Date:
March 1, 2011
Author(s):
Clayton A. Burningham, Chris P. Pantelides, and Lawrence D. Reaveley
Publication:
Symposium Papers
Volume:
275
Abstract:
This paper presents research that uses novel clamp anchors and a simple mechanical stressing device for post-tensioning carbon FRP (CFRP) composite rods. The CFRP system was used in the repair of prestressed and normal reinforced concrete beams controlled by flexural and shear failure, respectively. The scaled specimens were designed to simulate concrete bridge girders with two different types of field-observed damage—end cracking and damage to internal steel prestressing tendons caused from vehicle collision. The CFRP repair system increased the ultimate strength and proved to be a practical and feasible method of repairing concrete girders with reduced shear or flexural capacity.
DOI:
10.14359/51682470
SP275-61
Chuan Wang, Guijun Xian, and Jinping
Common FRP rebars or plates used for reinforcing or strengthening in civil engineering are made by fiber reinforced thermosetting polymer (FRSP) materials. FRSP can not be reshaped after being cured so that many of the bent shapes cannot be easily obtained and handled at site. In view of this, glass fiber reinforced polypropylene (GFRPP) were developed in according to fiber reinforced thermoplastic polymer systems. This paper is focused on the experimental and theoretical studies on the corrosion resistance of GFRPP rebar in alkali, acid and salt solution at various temperatures. And some durability life prediction was concluded through FHWA method, which may be valuable to understand the durability of GFRPP rebars in practice. The results reveal that these kinds of GFRPP rebars exhibits a bad resistance in alkali solution, may due to the vulnerable glass reinforcement. And further studies should be carried on to optimizing this kind of GFRPP rebar.
10.14359/51682471
SP275-62
Amr El-Ragaby and Ehab F. El-Salakawy
The bridge deck slab is a prime example where FRP bars are used as main concrete reinforcement. In Canada, bridge deck slabs are usually subjected to a variation of cold and hot weathering while directly sustain the traffic loads. Both fatigue and thermal loading are expected to adversely affect the overall performance of such structural elements. In this research, a total of 4 large-scale bridge deck slabs totally reinforced with glass FRP bars were constructed and tested under simulated long-term loading and environmental conditions. The slabs were subjected to 3,000,000 cycles of sinusoidal waveform fatigue loading combined with either 100 freeze-thaw cycles or continuous cold temperature for one month. The test parameters included the environmental conditioning and the reinforcement ratio. It was concluded that the overall behavior of GFRP-reinforced bridge deck slabs after being subjected to simulated long-term fatigue load cycles and freeze-thaw or cold temperature is satisfactory according to the current design codes.
10.14359/51682472
SP275-57
Z. Y. Sun, G. Wu, Z. S. Wu, and J. B. Hao
A parametric analysis and experimental study of concrete columns reinforced by steel-BFRP (basalt fiber reinforced polymer) composite bar (SBFCB) were conducted. The relationship between post-yield stiffness of SBFCB and SBFCB reinforced concrete columns was investigated. The influences of reinforcement ratio, axial compression ratio, and post-yield stiffness ratio were explored. The results show that (1) under the same reinforcement ratio, the post-yield stiffness of SBFCB columns increases with the post-yield stiffness ratio of SBFCB; (2) the higher the BFRP content of SBFCB, the better deformation capacity of SBFCB column can be achieved due to the smaller curvature demand of column base; (3) a higher SBFCB post-yield stiffness ratio can delay or prevent the collapse of concrete column caused by P- effect; (4) the residual displacements of SBFCB columns are much smaller than those of ordinary RC columns, that is, the SBFCB column has a more better post-earthquake repairability.
10.14359/51682467
SP275-58
Radhouane Masmoudi and Hamdy Mohamed
This paper presents the results of an experimental investigation on the strength and behavior of thirteen RC and CFFT columns. The effects of two parameters and their interactions on the buckling behavior were investigated; namely, the type of internal reinforcement (steel or CFRP bars) and the slenderness ratio. CFFT 152 mm, (6 in.)-diameter columns with different slenderness ratios 4, 8, 12, 16 and 20, were tested under pure compression load. Filament-winded FRP tubes with 2.65 mm (0.10 in.) thickness were used as a stay-in-place structural formwork for the CFFT columns. The axial compressive capacity of steel and CFRP-reinforced CFFT columns was reduced by 13% to 32% with increasing the slenderness ratio from 4 to 20. The behavior of CFRP bars as a compression reinforcement was generally similar to conventional steel bars. The test results indicated that the axial capacity of CFRP-reinforced CFFT columns is 13% lower compared to steel-reinforced CFFT columns.
10.14359/51682468
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