Influence of coarse aggregate on creep of ultra high strength concrete
As an intrinsic time-dependent property of concrete,creep has significant influence on load-bearing capacity and long-term service performance of concrete structures and members.With the focus on coarse aggregate,the effects of factors such as coarse aggregate content,maximum particle size and aggregate-matrix compatibility on mechanical property and creep performance of ultra high strength concrete(UHSC)were studied.The results show that with the introduction of coarse aggregate the creep of UHSC is remarkably lowered,and reducing the maximum particle size of coarse aggregate has negligible effect on restraining creep.Moreover,the amount of creep is not directly related to the strength of UHSC,but is mainly affected by the degree of cooperative development between strength and elastic modulus.At last,a prediction model on creep of UHSC is established based on correcting the FIB MC2010 model.
ultra high strength concretecoarse aggregatecreepprediction model
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