Abstract
Recycling or utilization of industrial waste is becoming more popular as people become more environmentally conscious. Silica fume is a by‐product of the smelting process in the silicon and ferrosilicon industries. This study examines the mechanical behavior of steel tubular composite column filled with conventional concrete and silica fume concrete experimentally under axial compressive loading. For the study, variability in steel tube thickness and column height with a constant diameter are considered. To explore the influence of silica fume in concrete, microstructural analyses are carried out by SEM, XRD, and FTIR. The experimental results reveal that the use of silica fume as a replacement of cement is feasible; the silica fume concrete‐filled steel tubular (SCFST) column has marginal enhancement strength capacity compared to CFST column as thickness increases.
Highlights
Recycling or utilization of industrial waste is becoming more popular as people become more environmentally conscious
To explore the influence of silica fume in concrete, microstructural analyses are carried out by scanning electron microscopy (SEM), X-ray diffraction (XRD), and FTIR. e experimental results reveal that the use of silica fume as a replacement of cement is feasible; the silica fume concrete-filled steel tubular (SCFST) column has marginal enhancement strength capacity compared to CFST column as thickness increases
To examine the performance infilled concrete in the CFST stub column under axial compressive loading, various research works carried out the experiment with different mixes with a constant cement content or with industrial byproducts and w/c ratio, which were mixed with industrial by-products such as steel slag, fly ash, silica fume, and lightweight aggregate [20,21,22,23,24]. ey are examined with the FE model and Euro code 4. e results explain that despite the use of various types of aggregates, all CFST columns behavior was reasonably well
Summary
In this experimental program, a nominal strength of 25 MPa with 0.4 water cement ratio was employed with various concrete combinations. To determine the compressive strength, cube specimens were prepared as per Indian Standards IS: 10086-1982. Silica fume was substituted by 0, 5, 10, and 15% with cement, manufacturing sand is completely replaced with fine aggregate in each mix, and superplasticizers up to 2% of the binder is used. A machine mixer was employed to prepare the mixes. Ree specimens were tested to failure under the compressive testing machine of axial capacity 2000 kN. E optimum percent replacement of the silica fume is carried out for 7 and 28 days of curing of cube specimen.
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