玄武岩纤维对橡胶混凝土抗冲击性能的影响

Effect of Basalt Fiber on Impact Resistance of Rubber Concrete

为研究玄武岩纤维(BF)对针状橡胶混凝土抗冲击性能的影响,通过落锤冲击试验,分析不同BF掺量和长度的针状橡胶混凝土抗冲击性能,结合扫描电子显微镜(SEM)观察微观结构并讨论增强机理,最后运用Weibull分布模型对抗冲击试验结果进行拟合。结果表明:BF可提高针状橡胶混凝土的抗冲击性能,当BF长为12 mm、掺量为0.1%时,针状橡胶混凝土的冲击耗能提升率最大,为54%,此时相较于普通混凝土,玄武岩纤维橡胶混凝土(BFRC)的冲击耗能提高了516%;冲击动能作用下,针状橡胶通过变形耗散部分动能,BF通过与基体间的黏结力和摩擦力耗散部分动能用于纤维的拉拔形变破坏,两种材料减小了冲击动能对混凝土基体的损伤,达到增韧阻裂的目的;BFRC的抗冲击次数可用双参数Weibull分布统计分析。

In order to study the effect of basalt fiber(BF)on the impact resistance of acicular rubber concrete,the impact resistance of acicular rubber concrete with different BF content,and lengths was analyzed through drop weight impact test,its microstructure was observed combined with scanning electron microscope(SEM)and the reinforcement mechanism was discussed.Finally,the results of impact resistance test were fitted by Weibull distribution model.The results showed that BF could improve the impact resistance of acicular rubber concrete.When the BF length was 12 mm and the content was 0.1%,the impact energy consumption of acicular rubber concrete was the largest,which was 54%.At this time,compared with ordinary concrete,the impact energy consumption of basalt fiber rubber concrete(BFRC)was increased by 516%;under the action of impact kinetic energy,acicular rubber could absorb deformation,rebound and release part of the consumed kinetic energy.BF dissipated part of the kinetic energy through adhesion and friction with the matrix for fiber drawing deformation and damage.The two materials jointly reduced the damage of impact kinetic energy to the concrete matrix and achieved the purpose of toughening and crack resistance;the impact times of BFRC could be statistically analyzed by two parameter Weibull distribution.