High strength concrete is structurally a different material and rules applicable to normal strength concrete are not
always conservative when applied to high strength concrete. Due to the variations in fracture modes,
microstructure and the differences brought about by various additives like silica fume, fly ash, superplasticizers,
etc, the empirical design rules originally intended for concrete strengths f'
c<50MPa, needs to be re-evaluated.
One of the reasons why some structural engineers are reluctant to use high strength concrete is due to the lack of
provisions in Concrete Standards to cover high strength concrete.
There are a number of advantages of using HSC in earthquake resistant structures. Concrete structures are
inherently heavy and hence have the potential to induce substantial inertial forces. High strength concrete
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