Pengaruh variasi campuran fly ash dan serbuk limbah keramik terhadap kuat tekan, kuat tarik belah, dan absorpsi pada beton

Concrete utilizing fly ash as a partial replacement for cement and ceramic waste powder as a partial replacement for fine aggregate was employed in this study to examine its effects on compressive strength, splitting tensile strength, and water absorption. The use of fly ash and ceramic waste powder serves as an effort to manage waste materials that continue to accumulate and are increasingly encountered, thereby helping to mitigate the impacts of waste buildup. This research was conducted using a laboratory experimental method. The concrete mix was designed to achieve a strength of 25 MPa based on SNI 03-2834-2000. The mixture consisted of 20% fly ash by cement weight and ceramic waste powder variations of 0%, 3%, 6%, 9%, and 12% by fine aggregate weight. A total of 54 cylindrical specimens were used, with three specimens for each variation for compressive strength, splitting tensile strength, and concrete absorption tests at the age of 28 days. The results indicate that the most optimal mixture for compressive and splitting tensile strength was 20% fly ash and 6% ceramic powder, producing a compressive strength of 31.46 MPa (an increase of 18.26%) and a splitting tensile strength of 2.44 MPa (an increase of 28.01%) compared to normal concrete. Meanwhile, the best absorption value was achieved with the 20% fly ash and 12% ceramic powder variation, resulting in 4.21% absorption or a 14.28% reduction. Overall, the 20% fly ash and 6% ceramic powder mixture produced the highest compressive and splitting tensile strengths, while the 20% fly ash and 12% ceramic powder mixture yielded the lowest absorption value, indicating that this combination of waste materials can be recommended to enhance concrete quality.