The crack characteristics of polypropylene concrete and plain concrete are investigated in the SHPB test. The relation between the character on the Crack Surface of Concrete and material properties and the impact pressure is analyzed. Also the multifractal characteristics are given on the Crack Surface of Concrete. The crack distributions of steel fiber reinforced concrete and polypropylene concrete are investigated. The crack resistance effects of fiber are analyzed from the degree of closenness and uniformity .
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