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Flexural behavior of hybrid beam prepared with RC and foam concrete
Muchtar I.
Aip Conference Proceedings
Abstract
Reinforced concrete beams become one of the elements discovered in structural buildings that function to withstand bending loads. Due to the bending load, the upper side of the beam is compressed and the lower side is tensile. In the flexural capacity analysis, the compressive side is considerably important in bearing the bending load, while the tensile side is excluded due to the low tensile strength of the concrete. The hypothesis of this study indicates that the tensile side of the concrete is replaceable with a material having a low volume weight correlated with a lower compressive strength such as foam concrete. Therefore, this study aims to analyze the flexural behavior of normal concrete hybrid beams and foam concrete. The specimen consists of a beam specimen with dimension of 150 mm (width) x 200 mm (height) with length of 3300 mm where foam concrete area with height of 7 cm in the concrete tensile area. The number of test specimens include normal concrete of BN beam specimen and foam concrete FC beam specimen. The research result indicates that under the flexural load, FC beam specimen presents similar behavior, where the ultimate load of BN specimen was 34.3 kN with deflection value of 46.67 mm, while the ultimate load of (FC) specimen was 33.3 kN with deflection value of 61.9 mm, as well as the ductility value and stiffness value of the BN specimen were 37% and 31% higher, compared to the FC beam specimen, respectively.