Global warming and environmental destruction have become major issues in the last few decades. Use of more and more economical friendly materials in construction is important. Presently in India, steel slag production is about 12 million tonnes per annum, due to limited modes of practices of utilization, steel slags are dumped in yards of each production and engage large area. To overcome these problems steel slag can be used in construction. This paper deals with the study of axial compressive behaviour of Composite column with partial replacement of fine aggregate by steel slag in concrete-filled steel tubular column with different cross-sections. Partial replacement of fine aggregate in Concrete filled steel tubular column will reduce the damage to the ecological balance due to excessive sand lifting from river beds, affecting the ground level. Tests are carried out on the specimens with varying cross-sections and hollow tubular members under axial compression.

The expansive soil like black cotton soil spread over southern Indian terrain. As a fast-growing nation like India, the need for infrastructure activities quickly takes place. For better structural capacity the geotechnical features are important. The soil stabilization is a technique in the part of improving the soil engineering properties like California Bearing Ratio (CBR), shear strength and compaction factors. In the present study, the black cotton soil stabilized with fibres to improve the engineering properties of soil. The study carried with natural fibres like sisal, banana and jute fibres. The ratio of 0.2%, 0.4% and 0.6% added in the dry weight of soil fraction with the soil for the strength gaining. The addition fibres increase the strength in the reasonable value for CBR up to 21.55% in 0.4% of banana, 0.6% of sisal and 0.6% of jute fibre combination. Optimum Moisture Content (OMC) increased up to 20% for the same combination. The results provide the combined scattered fibre effect to increase the strength parameters of soil.