Abstract
Compared to normal concrete, lightweight fiber-reinforced concrete (LFRC) offers several advantages, such as a high tensile strength-to-weight ratio and high energy dissipation under impact loading. However, LFRC has a lower compressive strength and modulus of elasticity than normal concrete; finding the appropriate mix design is also essential for structural engineering. This study aims to determine the best mix proportion of LFRC by evaluating the mechanical characteristics and energy dissipation capacity under impact loading. For this purpose, an experimental study is performed to optimize the mix proportion using three types of lightweight aggregates (Leca, expanded perlite, and expanded polystyrene). Moreover, the effects of two different steel and polyvinyl alcohol fibers on LFRC properties are investigated to improve the fracture energy and tensile strength. In both phases, two Drop Weight impact and Modified Charpy impact tests are utilized in addition to the quasi-static tests (compressive, splitting tensile, and flexural tests). A quality function is proposed to achieve the best mix proportion of lightweight concrete. The results demonstrate that the mixture containing 50% expanded perlite replacement with normal weight aggregates, 20% Slag as partial replacement of cement, 0.25% PVA fiber, and 0.25% steel fiber has the best performance in the mechanical properties and energy dissipation capacity as a structural lightweight fiber reinforced concrete.
Published Version
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