High strength concrete (HSC) may be defined as concrete with a specified characteristic cube strength between 60 and 100 N/mm2, although higher strengths have been achieved and used. Strength levels of 80 to 100 N/mm2 and even higher are being used for both precast and in-situ work in the USA, France, Norway and some other countries. The main applications for HSC in-situ concrete construction are in offshore structures, columns for tall buildings, long-span bridges and other highway structures. The main advantage is the reduction in size of compression elements and/or the amount of longitudinal reinforcement required.
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