Elastic modulus is a very important parameter in the design of concrete structure,and the composition of raw materials has a significant influence on the elastic modulus of concrete.The influence of different raw material composition on the elastic modulus of ultra-high performance concrete(UHPC)was analyzed by macroscopic elastic modulus analysis,XRD and nano-indentation.The results show that the ultrahigh performance concrete specimens of 75％cement+25％wollastonite group have the best performance in the indexes of elastic modulus,type and quantity of hydration products,nano-mechanical properties and hydration degree.In a certain range,the elastic modulus of UHPC can be improved by re-ducing the ratio of slurry to binder and water to binder.In order to improve the high elastic modulus of UHPC,it is rec-ommended that the slurry set ratio and water-binder ratio be 1∶1.25 and 0.18,respectively.
ultra-high performance concreteelastic moduluscementitious material compositionpaste aggre-gate ratiowater-cement ratio
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