Utilization of Eco-Friendly Hydraulic Cement in High-Strength Concrete-Filled Rectangular Steel Tubular Columns
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Abstract
This research focuses on studying the structural behavior of high-strength concrete-filled rectangular steel tubular columns with hydraulic cement under axial compression, and comparing them with high-strength concrete-filled steel tubular columns using Portland cement. The main parameters used in this study were the types of cement, curing time of concrete, and wall thicknesses of the steel tube. A total of 24 column specimens were tested under continuously increasing axial load until reaching their failure. The test columns were examined to determine their structural behavior, axial capacity, and key influencing parameters. From the tests, it was found that the response curves of the high-strength concrete-filled steel tubular columns exhibited linear elastic behavior up to approximately 90-95% of their maximum load capacity. Subsequently, the observed behaviors of the columns exhibited nonlinearity and high deformation before failure. The columns’ nonlinear behavior was of the strain-softening type. The failure modes of the specimens initiated with the occurrence of concrete cracks, followed by localized buckling of the steel tube wall. Furthermore, when comparing the experimental findings with the results derived from the ACI design equations, it can be concluded that the ACI design equations are suitable for predicting the maximum load of the high-strength concrete-filled steel tubular columns with hydraulic cement. Finally, the utilization of hydraulic cement has the potential to efficiently substitute Portland cement. Hydraulic cement is one approach that may contribute to significantly minimizing carbon dioxide emissions.
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