Akademik Veri Yönetim Sistemi
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING, cilt.30, sa.1, 2026 (SCI-Expanded, Scopus)
This research formulates novel one-part alkali-activated rapid-hardening repair mortars employing basic oxygen furnace slag (BOFS) and blast furnace slag (BFS). The roles of calcined magnesia (CM), carbon fibre (CF), and steel fibre (SF) on the physicomechanical, durability, and microstructural properties of repair mortars were investigated. On-site performance of repair mortars was periodically monitored and recorded. Fundamental findings highlight that BOFS and CM dominate the early age strength and promote rapid hardening characteristic for mortars, while BFS, CF, or SF affect the later age strength. All repair mortars fulfilled the strength criteria for class R1 reported in ASTM C928 and strength values up to 7 MPa at 3 h, 17.1 MPa at 1 day and 66.3 MPa at 28 days were achieved. The mortars successfully adhered to substrate concrete achieving pull-off bond strength values between 1.5 and 1.9 MPa. CM provides better volume stability and enhances the resistance of mortars to chloride ingress, high temperature, and frost attack. Similarly, the incorporation of CF and SF consistently reduced drying shrinkage and significantly ameliorated the flexural strength, high-temperature resistance and flexural-bond strength of mortars. On-site performance of repair mortars showed excellent resilience against extreme external conditions without displaying any visible cracking or abrasion.