Production of Portland Cement for concrete is a major source of CO2 emission. Concrete can be made more sustainable by replacing a large volume of the cement with Supplementary Cementitous Materials (SCMs) such as fly ash and slag. The amount of cement that can be replaced with SCMs in conventional concrete structures is limited due to slow strength gain. Concrete-Filled Tubes (CFT) are composite structural elements that consist of a steel tube with concrete infill. In CFT sections, neither formwork nor rebar is needed since the steel tube serves as both, which can reduce construction time and cost. In bridge construction, the steel tube itself has strength to support some dead weight of the superstructure prior to casting of the concrete. In this research, two 20-inch diameter CFT columns were tested for creep and shrinkage behavior under sustained axial loading. Subsequently, the specimens were tested until failure under combined loading consisting of constant axial load and increasing cyclic lateral load to evaluate seismic performance. One tube was filled with conventional self-consolidating concrete (SCC), while self-consolidating SCM concrete was used in the other specimen.
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