Study on neutron shielding properties of new boron carbide concrete
In order to shield neutron radiation,based on the theory of the closest packing,uses different volume fractions of boron carbide to replace cement,to prepare non-alkaline treatment and alkaline treatment industrial grade boron carbide concrete with different cement replacement rates,and tests its working properties,mechanical properties,pore structure and neutron shielding properties.The results show that the addition of non-alkaline treated boron carbide can reduce the compressive strength of concrete,and the alkaline treated boron carbide can eliminate the adverse effects of acid substances,improve the pore structure,and significantly improve the mechanical properties of concrete(compressive strength 112 MPa).At the same time,the boron carbide concrete after alkaline treatment has better mobility(260 mm)and neutron shielding ability(99％).With the increase of boron carbide replacement ratio,the shielding effect of slow neutron is significantly improved.
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