FLEXURAL BEHAVIOR OF REINFORCED CONCRETE BEAM USING ABACA FIBER

The use of concrete today is still the main choice in the development of both functioning as a structure and non-structure. Poor properties of concrete can be corrected by adding fibers to the concrete mix or called fibrous concrete. The addition of fiber to the concrete mortar aims to reinforce concrete with pieces of uniformly distributed fibers (uniform) into the concrete mortar with a random orientation, so as to prevent cracking. The purpose of this study is to discuss the flexural behavior of reinforced concrete beams using abaca fibers. The test specimens in this study were made 6 pieces of test specimens measuring 150 mm x 200 mm x 3300 mm consisting of 3 beams made of normal concrete (NRC) and 3 concrete beams using abaca fiber (FRC). To identify the melt in the reinforcement strain gauge mounted on the tensile reinforcement and in the concrete strain gauge is also installed in the cross-sectional area. The beam is statically loaded and LVDT installed to measure displacement in the center of the beam. Abaca fiber composition used is 0.15% of concrete concrete with a fiber length of 50 mm. The results were obtained for the bending moment capacity of the fibrous beams at the time of the first crack, when the steel yield and the ultimate load, each giving an increase of: 32.02%; 3.87% and 3.77% of the normal beam. Deflection in the abaca fibrous beam at the first crack and at the ultimate load, an increase of 32.21% and 7.52% of the normal beam. The relationship of load to the strain of the abaca fibrous beam at the time of the first crack and at the ultimate load, an increase of 50.55% and 12.64% of the normal beam. The crack length on normal concrete beams is longer and in concrete beams that use fiber, there are more multiple cracks.