Effect of Steel-Polyacrylonitrile Fiber Content on Fluidity and Mechanical Properties of Self-Compacting Concrete
In order to analyze the effects of hybrid fibers on working performance and mechanical properties of self-compacting concrete(SCC),collapse expansion degree,J-ring collapse expansion degree,V-shaped funnel passing time and cube compressive strength of SCC with different steel fiber(SF)content(0％,0.4％,0.8％and 1.2％,volume fraction)and polyacrylonitrile fiber(PAN)content(0％,0.04％,0.08％and 0.12％,volume fraction)at different curing ages(7 and 28 d)were tested,and the microstructure of SCC was analyzed by scanning electron microscopy(SEM).The results show that with the increase of fiber content,fluidity and pore passing ability of SCC decrease,and the segregation resistance of SCC is improved.The improvement effect of SF on 7 d compressive strength of SCC is more significant than that of PAN.The mixed fiber has a more obvious effect on compressive strength of early SCC than single-doped fiber,and the mixed fiber can also effectively improve the toughness and ductility of SCC.
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