This study aims to analyze the bending behavior of composite reinforced concrete beams containing styrofoam Research done by making test specimens of reinforced concrete beams measuring 15 cm x 20 cm x 250 cm with 12 pieces of test objects consisting three test specimens for each variation of styrofoam 0%, 30%, 40% and 50%. Tests carried out using a loading frame with monotonic loading system by giving two (2) periodic load point with a 1 kN to beam bending collapse. The mechanism of the collapse of the beams have the same pattern.
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