Experimental study of the durability of high-performance cementitious composites with amorphous metallic fibers

Abstract

Amorphous metal fibers (AMF) can significantly enhance the mechanical properties of cementitious composites, however, research on the durability properties of cementitious composites containing AMF is still incomplete. In this study,(AMF)were strategically utilized to enhance the durability of cementitious composite. The long-term performance of amorphous metal fibers reinforced cementitious composites (AMFRCC) with four fiber contents (0.4%, 0.8%, 1.2%, 1.6%) was systematically evaluated under chloride corrosion, sulfate cycling, and free-thaw cycling conditions, using conventional Steel fibers reinforced cementitious composites (SFRCC) as a control group, and the reliability life of AMFRCC under freeze–thaw conditions was predicted. The results showed that SF and AMF volume fractions above 1.2% are detrimental to cementitious materials' chloride ion penetration resistance. After dry and wet sulfate cycles, AMF is not corroded, while the uniformly dispersed AMF can fully exploit the crack arresting effect and reduce internal defects in cementitious materials. However, in long-term sulfate environments and freeze–thaw environments, corrosion of SF causes severe degradation of SFRCC performance. Furthermore, the Wiener model can more accurately predict the lifetime of AMFRCC and SFRCC in freeze–thaw environments when the relative dynamic modulus of elasticity is used as an indicator of degradation.