Mechanical properties and corrosion resistance of high performance fiber-reinforced concrete with steel or amorphous alloy fibers

In the present study, steel fiber and amorphous alloy fiber were applied either single-added or hybrid-added to produce high performance fiber-reinforced concrete (HPC). The results showed that the flowability of fresh concrete was reduced and the compressive, splitting and flexural strength was increased by adding fibers to the mixture. However, the effect of amorphous alloy fiber was more pronounced due to the higher aspect ratio compared to steel fiber. Addition of amorphous alloy fiber improves the interfacial structure and results in a greater maximum pull-out load and bond strength, whereas, a smaller interfacial toughness as compared to crimple steel fibers. After wet/dry cycles, the flexural strength and bond strength was raised about 8% and 10% after 3 days experimental period, but reduced 10% and 15% after 30 days experimental period for steel fiber-reinforced concrete (SFRC), however, has little difference for amorphous alloy fiber concrete (AAFRC). Additionally, the hybrid-fiber-reinforced concrete showed superior performance, especially the flexural property as compared to their single-fiber-reinforced counterparts due to combination effect of the two types of fibers which delay the formation of micro-cracks and macro-cracks, respectively. (paper)