Synergistic Effects of Fly Ash and Silica Fume on the Mechanical and Durability Performance of Metakaolin-Based Geopolymer Concrete. - Khalaf, Hussein K.; Abdulhussein, Samer S.; Moyet, Aous A.; Abbas, Israa M.; Keblawi, Ala Z. (Journal of Composite & Advanced Materials / Revue des Composites et des Matériaux Avancés, 2026)