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为了评价纤维对桥面铺装混凝土弯曲韧性的改良作用,对0%、0.3%、0.6%及0.9%体积含量的4种纤维混凝土进行弯曲韧性试验,通过比较荷载-挠度曲线可以看出掺纤维混凝土荷载挠度曲线呈现典型的非脆性破坏特点,且纤维掺量越高,峰值残余荷载越大,7d荷载残余值大于28d荷载残余值;弯曲韧性指数随纤维掺量的增加而增大,纤维掺量0.3%、0.6%、0.9%的混凝土韧性指数I5分别是不掺纤维的2.59倍、2.71倍和3.09倍;普通桥梁用有机纤维混凝土韧性指数I5平均水平一般是不掺纤维混凝土的1.22倍,研究制备的混凝土韧性高于桥梁用纤维混凝土平均韧性水平。
In order to evaluate the improvement effect of fiber on the flexural toughness of bridge deck pavement, the flexural toughness tests of four types of fiber concrete with volume contents of 0%, 0.3%, 0.6% and 0.9% were carried out. By comparing the load-deflection curves, The deflection curve of concrete shows typical non-brittle failure. The higher the fiber content, the greater the peak residual load and the residual value of 7d load is greater than the 28d load residual value. The flexural toughness index increases with the increase of fiber content. The toughness index I5 of 0.3%, 0.6%, 0.9% of the concrete were 2.59 times, 2.71 times and 3.09 times that of non-doped fiber respectively. The average toughness index I5 of common fiber reinforced concrete used in ordinary bridges was 1.22 times that of non-doped fiber concrete, The toughness of the concrete prepared is higher than the average toughness of the fiber reinforced concrete used in bridge.