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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。
In order to obtain the load-deflection curve of fiber-reinforced concrete, the influence of fiber on the toughness of fiber reinforced concrete was studied. Eight groups of hybrid fiber reinforced concrete specimens were prepared for tenacity test. The load-deflection curve The influence of different fiber types and dosages on the tenacity index of fiber reinforced concrete was analyzed. The relationship between tenacity index and flexural strength was also studied. The results show that the contribution of steel fiber to flexural strength is larger; the combination of milling steel fiber and imitation steel wire polypropylene fiber has the greatest contribution to the tenacity; the tenacity of acicular steel fiber reinforced concrete increases with the increase of fiber content The toughness index increased with the increase of fiber volume fraction and fiber number. The flexural strength of specimens with high toughness index was not necessarily large, and the flexural strength of 6.7 MPa corresponded to the lowest value of toughness index.