Percolation behavior of interfacial transition zone in steel fiber reinforced cement-based materials
To investigate the percolation behavior of interfacial transition zone(ITZ)in steel fiber reinforced cement-based materials,the aggregate and steel fiber particles are constructed using the actual superovoids and superellipsoids,a hard core-soft shell particle packing model for steel fiber reinforced cement-based materials is constructed,and the influences of aggregate shape,ITZ thickness,steel fiber content and steel fiber mor-phology on the ITZ percolation threshold are studied.ITZ percolation threshold prediction model is estab-lished,and the reliability of the model is verified by comparing with the numerical simulation in the literature.The results indicate that the ITZ percolation threshold decreases by about 10％when the square parameter of aggregate increases from 1 to 5;the ITZ percolation threshold decreases by about 40％when the fiber content increases from 0 to 1.0％;the ITZ percolation threshold increases by about 80％when the ITZ thickness is re-duced from 0.10 mm to 0.05 mm;the percolation threshold of ITZ decreases with enlarging specific surface area of aggregates and steel fibers,ITZ thickness,and steel fiber content,which can be explained by the more easily connection between ITZ.
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