Abstract
In this study an experimental investigation on shear behaviors of longitudinally reinforced lightweight aggregate concrete (LWC) beams made with sedimentary lightweight aggregate (LWA) without shear reinforcement was carried out and compared with companion normal-weight concrete (NWC) beams. The sedimentary LWA was a product of fine sediments excavated from the bottom of the Shih-Men Reservoir in Taiwan through proper air drying and sintering processes. A total of 24 simply supported beams were designed for shear failure with a two-point bending system. The primary variables of the investigation include concrete compressive strengths of 23, 43, and 53 MPa and ratios of shear span (a) to effective depth (d), a/d, of 1.5, 2.0, 2.5, and 3.0. The measured shear strengths at failures for all tested beams were recorded and carefully compared against each other. In addition, to assess the validity of the obtained test data, the test results were also compared with those obtained using the present ACI 318 Code equations and Rebeiz's equations for shear strength. The comparisons demonstrate that the obtained shear strengths of LWC and NWC beams are within an acceptable range of the ACI Code. This investigation concludes that sedimentary LWA is recommendable for structural concrete applications.
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