The hybrid mode of steel fiber and polyethylene fiber(PE)has been adopted to produce a novel high tough-ness cementitious composites(HTCC).The flexural behavior of HTCC has been experimentally investigated with consid-eration of different steel fiber lengths(6 mm,10 mm,13 mm)and different contents(0,0.3％,0.6％,0.9％).Standard three-point flexural test was carried out and the PE volume percentage was a constant of 1％for all specimens.The results show that the incorporation of steel fiber can significantly improve the flexural strength of the specimens compared with the specimens with single PE fiber.The failure mode of UHTCC is ductile failure,and the number and distribution range of cracks increase with the increase of steel fiber length and content.Compared with short fiber,long steel fiber has better enhancement effect on UHTCC.The flexural performance of UHTCC increases with the increase of steel fiber content,and the flexural performance of 6 mm steel fiber specimen is the best when the content is 0.9％.After the content of 10 mm steel fiber specimen reaches the peak point at 0.6％,the flexural performance of the specimen decreases.The flexural strength of 13 mm steel fiber specimens increases with the increase of content,but the deflection deformation decreases.
high toughness cementitious compositedouble fibersteel fiberpolyethylene fiberflexural per-formance
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