Akademik Veri Yönetim Sistemi
14. ULUSLARARASI AZERBAYCAN FEN, MÜHENDİSLİK, MATEMATİK VE UYGULAMALI BİLİMLER KONGRESİ, Baku, Azerbaycan, 26 - 27 Mart 2026, ss.671-680, (Tam Metin Bildiri)
Compressive strength behavior of Class C fly ash-based geopolymer mortars was investigated within NaOH, KOH, and Na₂O/SiO₂ activator series as a function of sand-to-fly ash ratio (S/FA) and activator level. The S/FA ratio was selected as 0, 1, and 2, whereas activator level was set at 8, 12, and 16 M for the NaOH and KOH series and 2.00, 2.75, and 3.50 modulus for the Na₂O/SiO₂ series. Strength assessment covered 7-day ambient curing, 7-day water curing, and 7- and 28-day measurements after pre-curing at 70 °C for 48 h. Results showed that an identical variable set did not produce similar strength trends across different activator systems. In the NaOH series, the highest 28-day strength was obtained from mix N-8-K0 with 15.85 MPa, indicating that lower S/FA levels defined a more favorable strength region within that series. In the KOH series, mix K-12-K2 reached 15.44 MPa, and the 12 M level provided a stronger mechanical region, particularly at medium and high S/FA ratios. In the Na₂O/SiO₂ series, the maximum strength was recorded in mix S-3.5-K2 with 10.44 MPa, while the effect of modulus varied depending on S/FA level. The overall pattern indicates that a single mixture design logic cannot be extended to all activator systems and that mixture selection should be based on strength trends identified within each individual series.