Abstract
This paper investigates the behavior of steel circular tubes filled with compacted cement that has very low water/cement ratios. Relatively high compaction pressures were used to compact the cement paste inside tubes using hydraulic jacking against a steel frame. After curing for 28 days, ten specimens were loaded axially to failure. The effects of water/cement ratio and compaction pressure on the ultimate axial load capacity and load-deformation performance of the columns were investigated. Axial and perimeter strains were measured using strain gauges. The study showed that the compaction pressure of the cement paste affects highly the ultimate axial load strength of the column. This was due to the preloading mobilization of lateral confinement of hardened cement paste by the steel tube, in addition to the increase of compressive strength of the cement paste itself by compaction. The load-deformation curves showed ductile behavior of the test specimens, which is a very important feature in dynamic and cyclic loading of columns as in the case of seismic loading and blast loading.
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