The word 'high-strength' is of course a relative term. The concrete with 28 day compressive strength in excess of 60 MPa is generally considered as high-strength concrete (HSC). Various basic properties of HSC are very much different from those of normal-strength concrete (NSC). The assessment of response of concrete structures highly depends on the accuracy of various basic properties of concrete. Most of the present code provisions are based on the tests on NSC and their extension to HSC may prove to be dangerous. Thus various basic properties of HSC are critically reviewed and their likely impacts on structural design considerations are discussed in detail. Finally it is stressed that HSC needs separate codes for its effective and beneficial use in structures.
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