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Properties of Fiber-Reinforced Structural and Non-Structural Ultra Lightweight Aggregate Concrete

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This study is focused on studying the effect of synthetic short fibers on the mechanical properties of ultra lightweight aggregate concrete (ULWAC). Both non-structural and structural fiber-reinforced ULWAC were considered. The data were collected from different studies, including 15 design papers submitted by universities in the USA and Canada to ASCE National Concrete Canoe Competition (NCCC) with 23 different ULWAC mixes. The data were analyzed, and new modified equations to determine the modulus of elasticity and modulus of rupture were proposed that could improve the accuracy of the current ACI equations. The statistical parameters of fiber reinforced structural ULWAC were determined, and high cost was associated with this type of concrete. Ductility indices for plates and beams, that have the capability to exhibit strain-hardening prior to failure, were calculated using energy-based method, and they were above the minimum required value of 3. Finally, a new model was proposed to predict the complete stress-strain behavior of fiber reinforced ULWAC under axial compression.
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Ductility; Elasticity; Fibers; Rupture; Structural Ultra Lightweight Concrete

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