Structural performance of biaxially-loaded slender hybrid self-compacting concrete columns with RPC shells
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The response of slender hybrid reinforced concrete columns composed of two advanced cementitious composites, self-compacting concrete (SCC) and reactive powder concrete (RPC), under biaxial eccentric compression has not been adequately documented. This study addresses this gap by comparing conventional SCC columns with hybrid SCC columns and examining the development of steel strains and lateral deformations. Six 140 × 140 mm square columns with an overall height of 1260 mm were tested at three eccentricity levels: low, medium, and high. The investigated variables were the outer-shell material, namely self-compacting normal concrete (SC-NC) or self-compacting reactive powder concrete (SC-RPC), and the eccentricity level. In the hybrid specimens, the SC-NC core and SC-RPC outer shell were cast concentrically under fresh-to-fresh conditions to ensure full interaction. The results showed that the use of SC-RPC as the outer-shell material significantly increased the ultimate load and moment capacities and improved the deformation and failure responses, particularly at high eccentricity. Therefore, SC-RPC shells can substantially enhance the structural performance and safety of slender hybrid reinforced concrete columns subjected to biaxial eccentric loading.
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