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ALI, Y. Abdel-zaher; AMBALAVANAN, R. Flexural behaviour of repaired rc beams using glass and carbon fiber repair systems under fatigue loading. In: CONGRESSO INTERNACIONAL SOBRE O COMPORTAMENTO DE ESTRUTURAS DANIFICADAS, 2., 2000, Rio de Janeiro. Anais... Rio de Janeiro, 2000.
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Abstract

Plain cement mortar is not used in most of the important repair works since it has a poor bond with the substrate. Resin mortar has excellent bond characteristics as well as tensile and flexural strength but it is incompatible with the substrate in addition to its high cost. Use of polymer modified cementitious mortar seems to be the compromise between plain and resin mortars. Apart from these mortars, carbon fiber and glass fiber reinforced mortars have been found to have a good bond with old concrete. This paper presents the results of an experimental investigation on the flexural behaviour of four RC beams under fatigue loading. Three beams were repaired using three different repair systems, namely, latex modified cement mortar, carbon fiber reinforced repair system and alkali resistant glass fiber repair system. The fourth beam was unrepaired control beam. The size of the beams was 120x200x1350 mm and reinforced with two 12 mm diameter Fe 415 steel rods. Fatigue loading was applied using a pulsating hydraulic jack. The load range was 24 kN to 48 kN with a frequency of 400 cycles per minute. The test results showed that all the four beams passed two million cycles successfully. The repaired beams exhibited higher ultimate load than the control beam. Glass and carbon fibers were superior to latex repaired or unrepaired beams from the ductility, toughness and strength points of view.
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