Performance Evaluation of Sustainable Concrete at Elevated Temperature Using Recycled Concrete Aggregate and Copper Slag

The requirement of sustainable development is a prime focus of today’s world. In this regard, utilization of construction and industrial waste possessing characteristics to be used as building materials will be a great push to achieve an equitable balance of environmental, social, and economic sufficiency for completing the trilogy of sustainable development. Incorporation of recycled concrete aggregate as replacement of natural coarse aggregate and replacement of fine aggregate with copper slag will guide us to the goal of sustainable development at a specific percentage of replacement levels. Recycled concrete aggregate is different from natural aggregate in terms of interfacial zone characterization as a new bond has to establish when we use RCA. A significant study has been done on RCA but a great deal of work is needed to understand the effect of elevated temperature on RCA through this experimental approach proper relationship between different replacement levels, and their impact on mechanical properties is discussed. To test the mechanical property at elevated temperatures of 150, 300, 450, 600 ℃ with replacement levels of 0, 33, 67, and 100% of natural aggregate with recycled concrete aggregate is performed and then keeping RCA replacement as 33% as control mix, replacement of fine aggregate up to 60% is done. From the experimental results, it is found that replacement of NA with 33% RCA shows better result in compressive and split tensile test. Fine aggregate is replaced by copper slag, and it is found that replacement of copper slag between 40 and 60% with 33% RCA as control mix shown better compressive strength.