路面纤维混凝土韧性试验研究

为获取纤维混凝土的荷载-挠度曲线,研究纤维对纤维混凝土韧度的影响,配制8组混杂纤维混凝土试件进行韧度试验,利用独立于试验机的数据采集装置获取试件的荷载-挠度曲线,分析不同纤维种类和掺量对纤维混凝土韧度指数的影响,并研究了韧度指数同弯拉强度的关系。结果表明：钢纤维对弯拉强度的贡献较大;铣削型钢纤维与仿钢丝聚丙烯纤维的组合对韧度的贡献最大,针状钢纤维混凝土的韧度随着纤维掺量的增加而增大;韧度指数随着纤维体积率和纤维根数的增加而增加;韧度指数高的试件弯拉强度不一定大,弯拉强度为6.7MPa对应着韧度指数的最低值。

Study of the Toughness of Fiber Reinforced Concrete Pavement in Laboratory

In order to get the load-deflection curve of fiber reinforced concrete(FRC),and study the fibers’ influence on the toughness of FRC,8 groups of FRC were molded and tested.The test data were obtained by data acquisition device which could generate load-deflection curve.The effect of fiber type and content on the FRC toughness index were analyzed,and the relation between toughness index and flexural strength were studied.The results show that steel fiber makes a great contribution to flexural strength.Mill-cut steel fiber works well with imitation wire polypropylene fiber in FRC,and the toughness index of the acicular steel fiber reinforced concrete increases with the increase of fiber contents.The toughness index increases with the increase of number and volume percentage of fiber,but the high toughness index specimen may not have the high flexural strength,and flexural strength 6.7 MPa corresponds to the minimum toughness index.