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There is no codified definition of Ultra high performance concrete (UHPC), also referred to as Ultra high strength concrete (UHSC). However it is considered to be a cement-based material exhibiting high compressive strength, high ductility and excellent durability.
fib Model Code 2010 covers concrete up to a characteristic strength (fck) of 120MPa. They define normal strength concrete (NSC) as fck<=50MPa and High strength concrete (HSC) as fck >50MPa. The characteristic compressive strength for UHSC is, by default, fck> 120MPa.
Acknowledgement: The Concrete Society