Akademik Veri Yönetim Sistemi
ENGINEERING SCIENCES, cilt.15, sa.1, ss.1-12, 2026 (TRDizin)
In this study, the incorporation of waste eggshell powder (ESP), a calcium carbonate (CaCO₃)-rich by-product of the food industry, into cement-based mortars was investigated. Eggshells were ground and calcined at 800 °C and 900 °C for two hours to produce ESP800 and ESP900. ESP replaced cement at 5%, 10%, and 15% by weight, yielding seven mortar mixtures. Thermal and microstructural properties were examined by TG/DSC, FE-SEM, and XRD. Workability was assessed with the flow table test, and specimens cured for 7 and 28 days were tested for ultrasonic pulse velocity (UPV), flexural strength (FS), and compressive strength (CS). Calcination temperature and replacement level significantly influenced performance. At 5% replacement, ESP900-5 achieved the best results, with a 28-day CS of 45.6 MPa, 9.9% higher than the control. At 15% replacement, FS decreased by 19% (ESP800) and 9% (ESP900), and CS decreased by 27.5% and 20%, respectively. UPV indicated denser matrices up to 10% replacement, with porosity increasing at 15%. Statistical analysis showed curing duration as the most influential positive factor, replacement ratio as the strongest negative effect, and calcination temperature as consistently beneficial. Multiple linear regression and ANOVA confirmed the statistical significance of these variables and demonstrated high predictive accuracy (R2 > 0.9).