Effect of Fly Ash as a Partial Substitute for Cement on the Splitting Tensile Strength of Concrete using Recycled Fine Aggregate

In order to support the environment, sustainable construction is one solution that can be implemented by utilizing construction waste efficiently. Every year, tons of concrete waste is generated and it is necessary to utilize the waste as a recycled material such as recycled aggregate. Production of cement for concrete also increases carbon dioxide (CO2) emissions in the air resulting from factory processing. Fly ash is considered capable of replacing cement as a constituent of concrete since it has pozzolanic properties. Therefore, the splitting tensile strength test has been carried out on concrete made from recycled fine aggregate with the utilization of fly ash as a partial substitute for cement. 0%, 25%, and 50% of fly ash type C were used as a partial replacement for cement, while 0%, 25%, 50%, 75%, and 100% of recycled fine aggregate replaced the natural fine aggregate. Recycled fine aggregates were obtained from parent concrete witha minimum compressive strength of 300 kg/cm2 . The splitting tensile strength of recycled fine aggregate concrete was tested at the age of 28 days. The results showed that the splitting tensile strength decreased with the increase in the percentage of fly ash as a substitute for cement, while the splitting tensile strength increased gradually starting from the use of recycled fine aggregate 0%to 75%