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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 96 Abstracts search results
Document:
SP230
Date:
October 1, 2005
Author(s):
Editors: Carol K. Shield, John P. Busel, Stephanie L. Walkup and Doug D. Gremel / Sponsored by: ACI Committee 440
Publication:
Symposium Papers
Volume:
230
Abstract:
This two volume set contains 95 papers from the 7th International Symposium and includes chapters devoted to materials characterization, masonry, bond, external strengthening, serviceability, design and behavior of members internally reinforced with FRP composites, FRP used for confinement, field applications, extreme events, and durability. The technical papers not only emphasize the experimental, analytical, and numerical validations of using FRP composites for externally strengthening or internally reinforcing concrete structures, but most are aimed at providing the insight needed for improving existing design guidelines. Several papers discuss the proposed design guidelines for deflections, shear strength, and reinforcing masonry, which practitioners should find useful. New applications are also featured, including studies and design equations for the use of near-surface-mounted FRP products, use of steel-reinforced polymer for reinforcing concrete, and the use of FRP to retrofit structures for blast mitigation. FRP composites performance is presented in chapters on durability and extreme events. Note: The individual papers are also available as .pdf downloads.. Please click on the following link to view the papers available, or call 248.848.3800 to order. SP230
DOI:
10.14359/14956
SP230-43
W. Figeys, L. Schueremans, K. Brosens, and D. Van Gemert
This paper deals with a new material for external reinforcement: Steel WireReinforced Polymer (SWRP). It consists of thin high-strength steel fibres embedded in apolymer laminate. This innovative material combines the advantages of steel platesand CFRP, which are already used today. The material cost of SWRP is relatively low,and the laminate is quite flexible. In the feasibility part, the practical use of SWRP isstudied. Further, the available design model for externally bonded reinforcement forconcrete elements is confronted with the results of an experimental program, carriedout at the Reyntjens Laboratory of KULeuven. The model is adapted accordingly.
10.14359/14864
SP230-44
P. Casadei, A. Nanni, T. Alkhrdaji, and J. Thomas
In the fall of 2002, a two story parking garage in Bloomington, Indiana, builtwith precast prestrestressed concrete (PC) double-T beams, was decommissioned dueto a need for increased parking-space. This led to the opportunity of investigating theflexural performance of the PC double-T beams, upgraded in the positive momentregion with steel reinforced polymer (SRP) composite materials, representing the firstcase study where this material has been applied in the field. SRP makes use of high-strength steel cords embedded in an epoxy resin. This paper reports on the test resultsto failure of three beams: a control specimen, a beam strengthened with one ply of SRPand a third beam strengthened with two plies of SRP anchored at both ends with SRP U-wraps. Results showed that SRP can significantly improve both flexural capacity andenhance pseudo-ductility.
10.14359/14865
SP230-40
N. Hoult and J. Lees
A shear retrofitting method for reinforced concrete (RC) beams has beendeveloped that uses external CFRP straps to provide additional shear capacity.Research has been undertaken to develop an installation technique that allows theCFRP strap to encompass the full depth of the beam, without requiring access to the topsurface of the beam. The current testing scheme investigates the durability of the CFRPstrap system using the new installation technique. A long-term load test was conductedon a RC T-beam which indicated that the straps continued to provide shear capacityafter 7 months under a load equivalent to 80% of the ultimate capacity of the retrofittedbeam. A cyclic test conducted on another similar T-beam specimen demonstrated thatafter 1,000,000 cycles, under a load that varied between 0.5 and 0.8 times the ultimateretrofitted beam capacity, the straps continued to provide effective shearenhancement.
10.14359/14861
SP230-41
A. Kong, A. Fam, and M.F. Green
Fiber-reinforced polymers (FRPs) are effective in strengthening concretestructures. However, little work has examined the effects of cold regions on thebehavior of the strengthened members, particularly the combined effects of sustainedloading and freeze-thaw exposure. This paper presents the results of an experimentalstudy on the durability of 70 normal weight, low strength, and non-air entrainedconcrete cylinders (150 x 300mm). The cylinders were confined with glass-FRP (GFRP)sheets or carbon-FRP (CFRP) sheets and exposed to 300 freeze-thaw cycles while undersustained axial compression loads. FRP-wrapped cylinders showed exceptionaldurability performance after their extreme exposure to freeze-thaw and sustainedloading with a maximum of 12% reduction in strength. Some CFRP wrapped cylindersthat were exposed to freeze-thaw without longitudinal restraint, by means of sustainedloads, and all the plain concrete cylinders were completely disintegrated with virtuallyzero residual strength.
10.14359/14862
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