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Recycled steel fiber processed from waste tires were used to prepare ultra-highperformance concrete. Ultra-high-performance concrete with normal industrial steel fiber and plain concrete without any steel fiber were also prepared for comparison. Experimental investigations were conducted to determine the mechanical properties of ultra-high-performance concretes, including compressive strength, splitting tensile strength, fracture energy and elastic modulus. Additionally, explosive spalling of concretes exposed to high temperature up to 800 °C was also tested. The recycled tire steel fiber could improve the fracture energy of concrete more significantly than normal industrial steel fiber. The splitting tensile strength of the recycled tire steel fiber reinforced concrete was also the highest among these concretes with various steel fibers. Moreover, the recycled steel fiber presented better behavior to resist the explosive spalling of the ultra-high-performance concrete. It is concluded that the recycled tire steel fiber help ultra-highperformance concrete possess higher toughness in terms of fracture energy and higher cracking resistance, so as to have higher resistance to thermally explosive cracking.

Comparison between Ultra-High-Performance Concretes with Recycled Steel Fiber and Normal Industrial Steel Fiber