Experimental Study On SHPB For All-lightweight Fiber Reinforced Concrete

All-lightweight concrete(ALWC)is a new excellent features building material,which has the characteristics of qualitative light,high strength,Earthquake and refractory.Mixed with different kinds of fiber,it can effectively improve the mechanical properties,it can be widely used in energy saving building,impact resistance and other special structure.So in this paper,the impact of the light shale ceramsite concrete performance was studied by SHPB impact test after the research based on the study of static mechanics performance,which investigated its energy dissipation effect.Specific work and research content are as follows:(1)Through the statics experiment of ALWFRC found that fiber possess enhancement effect,based on the stress-strain curve in the view of energy analysis,various kinds of fiber can improve the peak characteristics,and can make the decline more gentle;(2)When the bullet hit rate increased,it also increase included with the peak stress and fracture strain of concrete.Also,with the increase of the impact velocity the pieces of concrete have more and more,and gradually smaller.At the same time,found that it is related to fiber index,which has the fiber reinforced effects of toughening and energy dissipation,along with the increase of fiber index,the performance curve increased nonlinearly;(3)Combined with the processing date,there are the curve nonlinear relationship between the peak strain,failure strain,energy dissipation and the strain rate effect or fiber index by the fitting method;(4)it can modify the HJC dynamic constitutive model eventually,which considers the fiber enhancement effect,strain rate effect and the influence of fiber index.