关键词: 聚丙烯纤维;复合切口梁;凿毛处理;能量吸收值;等效抗弯拉强度

Abstract: After the old asphalt pavement has been treated by milling,the concrete overlay is mostly made of fiber concrete, in order to study the effect of polypropylene fiber andchisel handle on the bending toughness of composite notched beams,the three point loading test of high performance concrete-asphalt concrete(AC-13)composite notch beam with polypropylene fiber was carried out, the relation curves between load and deflection, CMOD were obtained, the flexural strength, energy absorption value and equivalent flexural tensile strength of composite beams were calculated.The results show that the polypropylene fiber and chisel handle can improve the bending performance of composite beam. Polypropylene fiber improves the flexural strength of composite beam.When the amount of polypropylene fiber increases 0.45,the content of feq1 and feq2 increases about 0.035 MPa,and the energy absorption of concrete increases by about 8%.Chisel handle greatly improved the equivalent flexural strength, the equivalent flexural strength of feq1 and feq2 increase by 0.05 MPa, 0.03 MPa, respectively.The improvement effect of chisel handle on feq1 is more obvious than that of feq2, so the energy absorption value of the composite beam increases by 20%on average.

Key words: polypropylene fiber;composite notchbeam;chisel handle;energy absorption value;equivalent flexural tensile strength