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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 97 Abstracts search results
Document:
SP188-61
Date:
August 1, 1999
Author(s):
Y. Sato, K. Shouji, T. Ueda, and Y. Kakuta
Publication:
Symposium Papers
Volume:
188
Abstract:
The uniaxial tensile tests of Reinforced Concrete elements with Carbon fiber sheet (RCC) are conducted to clarify the basic mechanical characteristics which affect the tension stiffness of RCC. This paper mainly presents the difference between RCC and ordinary Reinforced Concrete member (RC) in the load carrying capacity, the average crack spacing, stress and/or strain distributions of steel, and the average stress – strain relationship of concrete. Crack spacing of RCC becomes smaller between 25% and 60% of that in RC as the amount of Carbon Fiber Sheet (CFS) increases. The strain distributions of steel in RCC before and after the yielding of steel differ from those in RC. The tension stiffness developed by the bond action of CFS increases as the amount of CFS increases but that of steel becomes less. With the steel and CFS contributions combined, the tension stiffness of concrete as a whole generally becomes greater than that in RC. There is, however, a case in which tension stiffness of concrete in RCC decreases more than that in RC, because the average bond stress of steel rapidly decreases after the yielding of steel.
DOI:
10.14359/5665
SP188-58
C. Iihoshi, H. Fukuyama, Y. Matsumoto, and S. Abe
This paper describes the strengthening effect of RC elements with newly developed polyacetal-fiber (PAF) sheets. Typical properties of the polyacetal fiber obtained by drawing polyoxymethylene as a material for strengthening, are high strength, high strain capacity, high resistance to shear force, light weight and easy to handle by preformability. Polyacetal fiber reinforced special epoxy-resin that is optimized for this fibre, offers an outstanding combination of properties not available from steel and other high strength fibers, such as glass, aramid and carbon fibers which are used for the seismic retrofit of concrete structures. The advantages realized were the overall cost savings and strengthening of RC elements in one day, conditionally. Tests conducted to investigate the strengthening effect of concrete elements with polyacetal FRP are introduced in this paper. The loading tests were performed on 14 RC columns. The objective of the lateral loading tests is to investigate the shear and ductility strengthening effect with polyacetal FRP, and to clarify the possibility of this FRP as a material for seismic retrofit. The research work shows the prominent validity of concrete elements post-strengthened with polyacetal fibre for shear strength and ductility.
10.14359/5662
SP188-60
S. Morton
This paper presents the results of laboratory testing of concrete beams and field testing of two concrete T-Beam bridges that were externally strengthened with CFRP. As a result of the lab testing all the systems tested showed a considerable increase of 68% for the ultimate strength and 45% decrease in deflection for the beams with 2-#4 reinforcing bars . The beams with 2-#7 reinforcing bars showed a 60% increase in ultimate strength and a 26 % decrease in deflection when comparing the loads that produced yielding of the steel in the baseline and the 5 layer test. Both structures were load tested and monitored before and after application of the CFRP with strain gages and LVDTs. The results showed an increase up to 8% in stiffness and up to 15% decrease in strain. In addition to the load test a quality assurance NDT evaluation was performed on the bond using infrared thermography. The results showed typically less than 2% voids between the CFRP and the concrete.
10.14359/5664
SP188-89
M. Mettemeyer, P. Serra, M. D. Wuerthele, G. Schuster, and A. Nanni
This paper discusses the procedure and results from in-situ load tests performed on strengthened double tee beams in a precast parking garage. The load tests were performed to evaluate and confirm the performance of the double tees after the members had been strengthened in shear. Carbon FRP sheets were used as shear reinforcement at a 0/90° combination on the stem of each double tee. Load tests were performed on twenty double tees at various locations and floor levels of the parking structure. Each complete load test, including assembling and dismantling of the test equipment, was completed in approximately three hours. Results indicate that the shear strengthening systems increased the capacity of the double tee beams to meet the design load requirements.
10.14359/5696
SP188-05
H. Blontrock, L. Taerwe, and S. Matthys
As part of a research project on “Fire resistance of concrete elements strengthened with externally bonded FRP reinforcement”, a synthesis report is presented on the influence of elevated temperatures on the thermal and mechanical properties of FRP materials and resins, and on the influence of elevated temperatures on the behaviour of the interface between concrete and FRP. Also a survey of the results of fire tests on FRP strengthened or reinforced concrete members is given.
10.14359/5612
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