玄武岩纤维对水工抗冲磨混凝土性能的影响

Effect of Basalt Fiber on Performance of Hydraulic Abrasion Resistance Concrete

玄武岩纤维(BF)作为一种绿色环保型纤维具有突出的优点,但应用于水工抗冲磨混凝土的研究还比较少。研究了不同掺量BF及与硅粉复掺对水工抗冲磨混凝土的性能的影响,并与聚丙烯腈纤维(PANF)进行了对比。研究结果表明:掺加BF后混凝土的抗压强度略有降低,劈裂抗拉强度、轴心抗拉强度、抗压弹性模量、抗冲磨强度、抗渗性能均有所提高,干缩变形也略有增大;同掺量下BF混凝土的性能优于PANF混凝土;BF与硅粉复掺后混凝土各项性能提高显著,而干缩变形小于一般硅粉混凝土,可应用于水工抗冲磨混凝土。

Basalt fiber is a new type green fiber with some predominant advantages, its study to apply in hydraulic concrete with abrasion resistance is few. Different dosages of basalt fiber and the impact of basalt fiber blended with silica fume on the abrasion resistance of concretes are investigated, the concrete and polyacrylonitrile fiber are con- trasted simultaneously. The results show as follows： The compressive strength of the concrete with different basalt fibers is decreased by a little, its splitting tensile strength, axis tensile strength, elastic modulus, abrasion resistant strength and impermeability are enhanced obviously; its dry shrinkage is larger. With the same dosage, properties of the concrete with basalt fiber was superior to that with polyacrylonitrile fiber. Basalt fiber blended with silica fume can improve almost every properties of the concrete significantly, its dry shrinkage is less than that of ordinary silica fume concrete. This kind of concrete can be used in hydraulic concrete for abrasion resistance.