<p>Cement is a widely used building material; however, the significant emission of carbon dioxide during its production necessitate its replacement. Carbon dioxide generated during the cement production process can be mitigated by using alkali-activated composites that do not employ cement. Applying nanomaterials to alkali-activated composites can extend the performance and life of structures, thus reducing the frequency of maintenance. Moreover, amorphous metallic fibers have a simpler manufacturing process than steel fibers, which can reduce the carbon dioxide emissions originating from fiber manufacturing. This study evaluated the thermal, mechanical, and durability performances of cement-free alkali-activated composites containing various quantities of carbon nanotubes (CNTs) and amorphous metallic fibers (AMFs). Although the development of the maximum heat of hydration was slightly delayed in specimens containing 0.2% CNTs compared with the control, the hydration temperature was increased by up to 6.9%. The specimen containing 0.2% CNTs and 20&#xa0;kg/m³ AMFs exhibited the best thermal performance, reaching 40.1 ℃ after ~ 40&#xa0;min. The 28-d compressive strength of the specimen containing 0.2% CNTs and no AMFs was the highest (30.9&#xa0;MPa), ~ 5% higher than that of the control with no fibers. The splitting tensile strength increased with the AMF content to reach 4.7&#xa0;MPa in the specimen with 0.2% CNTs and 20&#xa0;kg/m³ AMFs, which was ~ 68% higher than that of the control sample. All of the specimens containing CNTs and AMFs exhibited higher flexural strengths than the control sample; in particular, the specimen containing 0.2% CNTs and 20kg/m³ AMFs exhibited a 56-d flexural strength that was 20.9% higher than that of the control sample. Finally, the drying shrinkage of the specimen containing 0.2% CNTs and no AMFs was the highest (approximately 0.077%), and the drying shrinkage decreased as the AMF content increased.</p>