Abstract:
Concrete is the most extensively utilized construction material globally and is increasingly used due to industrialization and
urbanization. Currently, most scientists worldwide are concentrating their attention on e ective strategies to adopt materials from
large amounts of waste resources as a partial substitute for cement in concrete production due to scarcity of resources and
continuous environmental pollution. In this study, an experimental investigation was conducted on the properties of concrete
made from the partial replacement of cement by hybrid co ee husk ash (CHA) and sugarcane bagasse ash (SCBA). e study
considered di erent percentages (0%, 5%, 10%, and 15%) of hybrid ash to assess the engineering properties of fresh and hardened
concrete of C-20/25. A slump and compaction factor test was conducted to study the workability of fresh concrete. e study
showed that, as the percentage of replacement increased from 0% to 15%, the workability of the concrete decreased up to 15.15%.
In addition, compression, split tensile, and exural tests were done on the 7th, 14th, and 28th days to investigate the properties of
hardened concrete. Based on the test result, 10% of hybrid ash was the maximum percentage of replacement that showed a
compressive and tensile strength greater than the target strength. erefore, the study concludes that up to 10% replacement of
cement by hybrid ash may be employed in concrete production, which in turn is used to minimize the cost of construction and
environmental pollution by recycling waste co ee husk and sugarcane bagasse.
