In the recent design of a sustainable high ductile fiber-reinforced cementless composite, optimizing both sustainable and mechanical properties is critical. The purpose of current research is to develop a sustainable material while maintaining high ductility, represented by strain-hardening behavior in tension. The sustainable material is referred as a sustainable high ductile fiber-reinforced cementless composite which is manufactured using ground granulated blast-furnace slagbased alkali-activated cementless binder mixing with poly vinyl alcohol fibers. Three mixture proportions which had proper flowability and viscosity in fresh state in order to mix easily and disperse fibers uniformly were determined according to alkali activators and admixtures. A series of experiments on compression, direct-tension, and panel bending responses were carried out on the hardened composites. The fresh composites showed an average of 465 mm slump flow, the hardened composites were able to obtain the tensile strain up to 2.8%, and the ratio of bending deflection to span length was up to 14.3% with multiple micro-cracks.