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运用超声波在混凝土中传播的声学特性,分析玄武岩纤维掺量分别为0、0.12%、0.36%和0.60%的玄武岩纤维混凝土(Basalt Fiber Reinforced Concrete,BFRC)的抗冲击性能及其损伤演化过程。试验结果表明:玄武岩纤维可以显著提高混凝土的冲击韧性,当纤维掺量为0.36%时,抗冲击性能最佳。试验通过超声波变速与混凝土损伤之间关系定义损伤变量D,通过D的变化来表征混凝土冲击循环疲劳损伤特性,并借助损伤力学观点,基于混凝土受载条件下损伤变量D建立玄武岩纤维混凝土冲击荷载的损伤演化模型。
Based on the acoustic characteristics of ultrasonic propagation in concrete, the impact resistance and damage evolution of Basalt Fiber Reinforced Concrete (BFRC) with basalt fiber content of 0, 0.12%, 0.36% and 0.60% were analyzed. The test results show that: Basalt fiber can significantly improve the impact toughness of concrete, when the fiber content of 0.36%, the best impact resistance. The damage variable D is defined by the relationship between ultrasonic speed change and concrete damage, and the cyclic fatigue damage characteristics of concrete are characterized by the change of D. Based on the damage mechanics view, the impact load of basalt fiber reinforced concrete is established based on the damage variable D under concrete loading condition Damage evolution model.