Production of sustainable concrete with treated cement kiln dust and iron slag waste aggregate

Blast furnaces create iron and steel from pig iron, which in turn produces iron slag. Iron ore is the primary raw material for these transformations. Slag aggregate, a byproduct of the iron and steel industry, is a sustainable building material. In order to produce more environmentally friendly and cost-effective concrete, this study evaluated the effect of inclusion of two waste materials in concrete including, 10% treated cement kiln dust (TCKD) as cement weight replacement with different volumetric contents (15, 25, and 35%) of iron slag coarse aggregate (ISCA) as a replacement to natural coarse aggregate. Microstructure, static modulus of elasticity, splitting tensile strength, flexural strength, water absorption, and workability were among the many concrete qualities studied. There was an improvement in oven-dry, splitting tensile, flexural, compressive, ultrasonic pulse velocity, and static modulus of elasticity as ISCA content rose, as shown in the results. Increasing the ISCA concentration reduces thermal conductivity. Depending of the ISCA content, increasing the compressive strength by 1.43-12.4% and the splitting tensile strength by 0.4-5.34% were both possible. There was an additional increase of 1.3-9.15% in flexural strength. From the experimental results, it can be observed that innovative and potent method for producing structural sustainable concrete is provided in this study by inclusion of two waste materials, including TCKD and ISCA. The sustainable concrete produced has high strength and low thermal conductivity relative to concrete not containing these waste materials, which can be used in different construction projects. Moreover, the use of these waste materials in concrete has a benefit of reducing the environmental pollution. All the above-mentioned results conforms the goal of this study.