纤维/高强混凝土抗冻性能试验

Experimental study on the freezing resistance of fiber reinforced high strength concrete

  • 摘要: 通过纤维/高强混凝土快速冻融循环试验,从试件外观损伤形态、相对动弹性模量、抗冻等级、抗冻耐久性指数角度,研究了不同纤维体积分数的玄武岩纤维、纤维素纤维和不同纤维长度的玄武岩纤维对C60高强混凝土抗冻性能的影响。结果表明,加入玄武岩或纤维素纤维可改善C60高强混凝土的外观剥落损伤程度。C60高强混凝土的抗冻性均随玄武岩纤维(长度为18 mm)和纤维素纤维体积分数的增大而提高,在体积分数0.10vol%~0.20vol%内,前者的提高程度远大于后者,玄武岩纤维/高强混凝土能在更严酷的寒冷环境中满足更久的使用时间。玄武岩纤维长度的改变对C60高强混凝土的抗冻性影响较大,相对于18 mm长度,6 mm和30 mm长度的玄武岩纤维对C60高强混凝土抗冻性能改善作用很有限。

     

    Abstract: The effects of fiber volume fraction of basalt fibers and cellulose fibers and fiber length of basalt fibers on the freezing resistance of C60 high strength concrete were studied by the quick freezing and thawing cycle test of fiber reinforced high strength concrete. The appearance damage form, relative dynamic modulus of elasticity, freezing resistance grade and freezing durability index of specimens were analyzed. The results show that, basalt fiber and cellulose fiber can improve the appearance of spalling of high strength concrete. The freezing resistance of C60 high strength concrete increases with the increase of the volume fraction of basalt fiber (18 mm length) and cellulose fiber. Within volume fraction of 0.10vol%-0.20vol%, the improvement degree of basalt fiber is much greater than that of cellulose fibers. Basalt fiber reinforced high strength concrete can be used for a longer period of time in the harsher cold environments. The fiber length of basalt fiber greatly affects the freezing resistance of C60 high strength concrete. Compared with the basalt fibers with 18 mm length, the effect of basalt fibers with 6 mm or 30 mm length on the freezing resistance of C60 high strength concrete is very limited.

     

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