Mechanical properties and prediction method of barite radiation-proof concrete
As an effective shielding material,barite radiation-proof concrete(BRC)has been widely used in nuclear medicine construc-tions.To study the basic mechanical properties of BRC,the factors affecting its mechanical properties were reviewed,and the differences between BRC and reference natural concrete were compared using the experimental data collected from the literature,and the applicability of the prediction formula of typical codes was reviewed and modified.The results show that there is an approximately good linear relation-ship between the compressive strength and the water-cement ratio of BRC,which conforms to Bolomy formula.The mechanical properties of BRC can be improved by adding cathode ray tube spent glass fine aggregate.The compressive strength,splitting tensile strength,axial compressive strength and elastic modulus of BRC are decreased by 3.6％,26％,32％and 37.3％than those of reference natural concrete,respectively.ACI 318 specification can effectively predict its early-age compressive strength,but underestimate its elastic modulus.EC 2 specification can effectively predict the elastic modulus,but underestimate the splitting tensile strength of BRC.The modified ACI 318 and EC 2 models can predict the mechanical properties of BRC.
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